---
_id: '21947'
abstract:
- lang: eng
  text: Wall slip is a long-known phenomenon in the field of rheology. Nevertheless,
    the origin and the evolution are not completely clear yet. Regarding suspensions,
    the effect becomes even more complicated, because different mechanisms like pure
    slip or slip due to particle migration have to be taken into account. Furthermore,
    suspensions themselves show many flow anomalies and the isolation of slip is complicated.
    In order to develop working physical models, further insight is necessary. In
    this work, we measured experimentally the wall slip velocities of different highly
    filled suspensions in a rectangular slit die directly with respect to the particle
    concentration and the particle size. The slip velocities were obtained using a
    particle image velocimetry (PIV) system. The suspensions consisting of a castor
    oil–cinnamon oil blend and PMMA particles were matched in terms of refractive
    indexes to appear transparent. Hereby, possible optical path lengths larger than
    15 mm were achieved. The slip velocities were found to be in a quadratic relation
    to the wall shear stress. Furthermore, the overall flow rate as well as the particle
    concentration has a direct influence on the slip. Concerning the shear stress,
    there seem to be two regions of slip with different physical characteristics.
    Furthermore, we estimated the slip layer thickness directly from the velocity
    profiles and propose a new interpretation. The PIV technique is used to investigate
    the viscosity and implicit the concentration profile in the slit die. It is shown
    that the particle migration process is quite fast.
article_type: original
author:
- first_name: Steffen
  full_name: Jesinghausen, Steffen
  id: '3959'
  last_name: Jesinghausen
  orcid: https://orcid.org/0000-0003-2611-5298
- first_name: Rene
  full_name: Weiffen, Rene
  last_name: Weiffen
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
citation:
  ama: Jesinghausen S, Weiffen R, Schmid H-J. Direct measurement of wall slip and
    slip layer thickness of non-Brownian hard-sphere suspensions in rectangular channel
    flows. <i>Experiments in Fluids</i>. Published online 2016. doi:<a href="https://doi.org/10.1007/s00348-016-2241-6">10.1007/s00348-016-2241-6</a>
  apa: Jesinghausen, S., Weiffen, R., &#38; Schmid, H.-J. (2016). Direct measurement
    of wall slip and slip layer thickness of non-Brownian hard-sphere suspensions
    in rectangular channel flows. <i>Experiments in Fluids</i>. <a href="https://doi.org/10.1007/s00348-016-2241-6">https://doi.org/10.1007/s00348-016-2241-6</a>
  bibtex: '@article{Jesinghausen_Weiffen_Schmid_2016, title={Direct measurement of
    wall slip and slip layer thickness of non-Brownian hard-sphere suspensions in
    rectangular channel flows}, DOI={<a href="https://doi.org/10.1007/s00348-016-2241-6">10.1007/s00348-016-2241-6</a>},
    journal={Experiments in Fluids}, author={Jesinghausen, Steffen and Weiffen, Rene
    and Schmid, Hans-Joachim}, year={2016} }'
  chicago: Jesinghausen, Steffen, Rene Weiffen, and Hans-Joachim Schmid. “Direct Measurement
    of Wall Slip and Slip Layer Thickness of Non-Brownian Hard-Sphere Suspensions
    in Rectangular Channel Flows.” <i>Experiments in Fluids</i>, 2016. <a href="https://doi.org/10.1007/s00348-016-2241-6">https://doi.org/10.1007/s00348-016-2241-6</a>.
  ieee: 'S. Jesinghausen, R. Weiffen, and H.-J. Schmid, “Direct measurement of wall
    slip and slip layer thickness of non-Brownian hard-sphere suspensions in rectangular
    channel flows,” <i>Experiments in Fluids</i>, 2016, doi: <a href="https://doi.org/10.1007/s00348-016-2241-6">10.1007/s00348-016-2241-6</a>.'
  mla: Jesinghausen, Steffen, et al. “Direct Measurement of Wall Slip and Slip Layer
    Thickness of Non-Brownian Hard-Sphere Suspensions in Rectangular Channel Flows.”
    <i>Experiments in Fluids</i>, 2016, doi:<a href="https://doi.org/10.1007/s00348-016-2241-6">10.1007/s00348-016-2241-6</a>.
  short: S. Jesinghausen, R. Weiffen, H.-J. Schmid, Experiments in Fluids (2016).
date_created: 2021-05-04T08:47:31Z
date_updated: 2023-01-17T07:37:53Z
department:
- _id: '150'
- _id: '9'
doi: 10.1007/s00348-016-2241-6
keyword:
- Rheology
- Wall Slip
- Slip
- apparent slip
- suspension
language:
- iso: eng
main_file_link:
- url: https://link.springer.com/article/10.1007/s00348-016-2241-6
publication: Experiments in Fluids
publication_identifier:
  issn:
  - 0723-4864
  - 1432-1114
publication_status: published
quality_controlled: '1'
status: public
title: Direct measurement of wall slip and slip layer thickness of non-Brownian hard-sphere
  suspensions in rectangular channel flows
type: journal_article
user_id: '3959'
year: '2016'
...
---
_id: '25140'
article_type: original
author:
- first_name: Sven
  full_name: Pieper, Sven
  last_name: Pieper
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
  orcid: 000-0001-8590-1921
citation:
  ama: Pieper S, Schmid H-J. Layer-formation of non-colloidal suspensions in a parallel
    plate rheometer under steady shear. <i>Journal of Non-Newtonian Fluid Mechanics</i>.
    Published online 2016:1-7. doi:<a href="https://doi.org/10.1016/j.jnnfm.2016.04.004">10.1016/j.jnnfm.2016.04.004</a>
  apa: Pieper, S., &#38; Schmid, H.-J. (2016). Layer-formation of non-colloidal suspensions
    in a parallel plate rheometer under steady shear. <i>Journal of Non-Newtonian
    Fluid Mechanics</i>, 1–7. <a href="https://doi.org/10.1016/j.jnnfm.2016.04.004">https://doi.org/10.1016/j.jnnfm.2016.04.004</a>
  bibtex: '@article{Pieper_Schmid_2016, title={Layer-formation of non-colloidal suspensions
    in a parallel plate rheometer under steady shear}, DOI={<a href="https://doi.org/10.1016/j.jnnfm.2016.04.004">10.1016/j.jnnfm.2016.04.004</a>},
    journal={Journal of Non-Newtonian Fluid Mechanics}, author={Pieper, Sven and Schmid,
    Hans-Joachim}, year={2016}, pages={1–7} }'
  chicago: Pieper, Sven, and Hans-Joachim Schmid. “Layer-Formation of Non-Colloidal
    Suspensions in a Parallel Plate Rheometer under Steady Shear.” <i>Journal of Non-Newtonian
    Fluid Mechanics</i>, 2016, 1–7. <a href="https://doi.org/10.1016/j.jnnfm.2016.04.004">https://doi.org/10.1016/j.jnnfm.2016.04.004</a>.
  ieee: 'S. Pieper and H.-J. Schmid, “Layer-formation of non-colloidal suspensions
    in a parallel plate rheometer under steady shear,” <i>Journal of Non-Newtonian
    Fluid Mechanics</i>, pp. 1–7, 2016, doi: <a href="https://doi.org/10.1016/j.jnnfm.2016.04.004">10.1016/j.jnnfm.2016.04.004</a>.'
  mla: Pieper, Sven, and Hans-Joachim Schmid. “Layer-Formation of Non-Colloidal Suspensions
    in a Parallel Plate Rheometer under Steady Shear.” <i>Journal of Non-Newtonian
    Fluid Mechanics</i>, 2016, pp. 1–7, doi:<a href="https://doi.org/10.1016/j.jnnfm.2016.04.004">10.1016/j.jnnfm.2016.04.004</a>.
  short: S. Pieper, H.-J. Schmid, Journal of Non-Newtonian Fluid Mechanics (2016)
    1–7.
date_created: 2021-09-29T14:21:35Z
date_updated: 2023-04-27T11:21:10Z
department:
- _id: '150'
doi: 10.1016/j.jnnfm.2016.04.004
language:
- iso: eng
page: 1-7
publication: Journal of Non-Newtonian Fluid Mechanics
publication_identifier:
  issn:
  - 0377-0257
publication_status: published
quality_controlled: '1'
status: public
title: Layer-formation of non-colloidal suspensions in a parallel plate rheometer
  under steady shear
type: journal_article
user_id: '3959'
year: '2016'
...
---
_id: '26108'
abstract:
- lang: eng
  text: The highly efficient filtration of ultrafine dust emitted by biomass combustion
    processes with a baghouse filter has been successfully tested in the last years.
    To protect the filter material from the very small and sticky fine dust particles
    and to guarantee very high total collection efficiencies (> 99 %) in a long-term
    stable process, the use of a precoat is necessary. Tests done in a laboratory
    and a real-application plant show that the reuse of precoat materials can lead
    to significant savings. Considering the influences of different combustion processes,
    the associated precoat efficiencies could be calculated. With these characteristic
    ratios, it is possible to evaluate different process settings. Hence, the amount
    and the cost of the needed precoat could be reduced significantly.
author:
- first_name: Sascha
  full_name: Schiller, Sascha
  last_name: Schiller
- first_name: Christoph
  full_name: Hellmich, Christoph
  last_name: Hellmich
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
citation:
  ama: Schiller S, Hellmich C, Schmid H-J. Evaluation of the Efficiency of Filtration
    Processes Using Precoat Materials. <i>Chemical Engineering &#38; Technology</i>.
    Published online 2015:491-498. doi:<a href="https://doi.org/10.1002/ceat.201500385">10.1002/ceat.201500385</a>
  apa: Schiller, S., Hellmich, C., &#38; Schmid, H.-J. (2015). Evaluation of the Efficiency
    of Filtration Processes Using Precoat Materials. <i>Chemical Engineering &#38;
    Technology</i>, 491–498. <a href="https://doi.org/10.1002/ceat.201500385">https://doi.org/10.1002/ceat.201500385</a>
  bibtex: '@article{Schiller_Hellmich_Schmid_2015, title={Evaluation of the Efficiency
    of Filtration Processes Using Precoat Materials}, DOI={<a href="https://doi.org/10.1002/ceat.201500385">10.1002/ceat.201500385</a>},
    journal={Chemical Engineering &#38; Technology}, author={Schiller, Sascha and
    Hellmich, Christoph and Schmid, Hans-Joachim}, year={2015}, pages={491–498} }'
  chicago: Schiller, Sascha, Christoph Hellmich, and Hans-Joachim Schmid. “Evaluation
    of the Efficiency of Filtration Processes Using Precoat Materials.” <i>Chemical
    Engineering &#38; Technology</i>, 2015, 491–98. <a href="https://doi.org/10.1002/ceat.201500385">https://doi.org/10.1002/ceat.201500385</a>.
  ieee: 'S. Schiller, C. Hellmich, and H.-J. Schmid, “Evaluation of the Efficiency
    of Filtration Processes Using Precoat Materials,” <i>Chemical Engineering &#38;
    Technology</i>, pp. 491–498, 2015, doi: <a href="https://doi.org/10.1002/ceat.201500385">10.1002/ceat.201500385</a>.'
  mla: Schiller, Sascha, et al. “Evaluation of the Efficiency of Filtration Processes
    Using Precoat Materials.” <i>Chemical Engineering &#38; Technology</i>, 2015,
    pp. 491–98, doi:<a href="https://doi.org/10.1002/ceat.201500385">10.1002/ceat.201500385</a>.
  short: S. Schiller, C. Hellmich, H.-J. Schmid, Chemical Engineering &#38; Technology
    (2015) 491–498.
date_created: 2021-10-13T13:38:58Z
date_updated: 2022-01-06T06:57:16Z
doi: 10.1002/ceat.201500385
language:
- iso: eng
page: 491-498
publication: Chemical Engineering & Technology
publication_identifier:
  issn:
  - 0930-7516
publication_status: published
status: public
title: Evaluation of the Efficiency of Filtration Processes Using Precoat Materials
type: journal_article
user_id: '70093'
year: '2015'
...
---
_id: '26119'
abstract:
- lang: eng
  text: The emphasis of the study presented is on a new process of particle extraction
    to transfer magnetite nanoparticles from an aqueous into an immiscible organic
    phase directly through the liquid-liquid interface. For the production of high-quality
    organosols, stabilized colloidal and functionalized particles are required in
    a liquid organic phase. The mechanism of phase transfer is initiated by adsorption
    and chemical binding of surfactants (fatty acids) at the particle surface. The
    resulting physico-chemical dispersion of the hydrophobically modified particles
    leads to the formation of the stabilized organic colloid, or organosol. The aim
    here is to demonstrate the entire chain of the transfer process in a continuous
    miniplant, which comprises particle synthesis, conditioning, and transfer, and
    which uses a drop column for extraction and as a transfer device. Based on the
    investigation of the governing principles and the material parameters, the results
    obtained for the transfer kinetics in the individual contact devices (centrifuge,
    single-drop column, and drop column for different operations) are used for the
    dimensioning of the entire process chain.
author:
- first_name: Jacqueline V.
  full_name: Erler, Jacqueline V.
  last_name: Erler
- first_name: Stefanie
  full_name: Machunsky, Stefanie
  last_name: Machunsky
- first_name: Steffen
  full_name: Franke, Steffen
  last_name: Franke
- first_name: Philipp
  full_name: Grimm, Philipp
  last_name: Grimm
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
- first_name: Urs A.
  full_name: Peuker, Urs A.
  last_name: Peuker
citation:
  ama: 'Erler JV, Machunsky S, Franke S, Grimm P, Schmid H-J, Peuker UA. Process Development
    of a Liquid-Liquid Phase Transfer of Colloidal Particles for Production of High-Quality
    Organosols. In: <i>Colloid Process Engineering</i>. ; 2015. doi:<a href="https://doi.org/10.1007/978-3-319-15129-8_16">10.1007/978-3-319-15129-8_16</a>'
  apa: Erler, J. V., Machunsky, S., Franke, S., Grimm, P., Schmid, H.-J., &#38; Peuker,
    U. A. (2015). Process Development of a Liquid-Liquid Phase Transfer of Colloidal
    Particles for Production of High-Quality Organosols. In <i>Colloid Process Engineering</i>.
    <a href="https://doi.org/10.1007/978-3-319-15129-8_16">https://doi.org/10.1007/978-3-319-15129-8_16</a>
  bibtex: '@inbook{Erler_Machunsky_Franke_Grimm_Schmid_Peuker_2015, place={Cham},
    title={Process Development of a Liquid-Liquid Phase Transfer of Colloidal Particles
    for Production of High-Quality Organosols}, DOI={<a href="https://doi.org/10.1007/978-3-319-15129-8_16">10.1007/978-3-319-15129-8_16</a>},
    booktitle={Colloid Process Engineering}, author={Erler, Jacqueline V. and Machunsky,
    Stefanie and Franke, Steffen and Grimm, Philipp and Schmid, Hans-Joachim and Peuker,
    Urs A.}, year={2015} }'
  chicago: Erler, Jacqueline V., Stefanie Machunsky, Steffen Franke, Philipp Grimm,
    Hans-Joachim Schmid, and Urs A. Peuker. “Process Development of a Liquid-Liquid
    Phase Transfer of Colloidal Particles for Production of High-Quality Organosols.”
    In <i>Colloid Process Engineering</i>. Cham, 2015. <a href="https://doi.org/10.1007/978-3-319-15129-8_16">https://doi.org/10.1007/978-3-319-15129-8_16</a>.
  ieee: J. V. Erler, S. Machunsky, S. Franke, P. Grimm, H.-J. Schmid, and U. A. Peuker,
    “Process Development of a Liquid-Liquid Phase Transfer of Colloidal Particles
    for Production of High-Quality Organosols,” in <i>Colloid Process Engineering</i>,
    Cham, 2015.
  mla: Erler, Jacqueline V., et al. “Process Development of a Liquid-Liquid Phase
    Transfer of Colloidal Particles for Production of High-Quality Organosols.” <i>Colloid
    Process Engineering</i>, 2015, doi:<a href="https://doi.org/10.1007/978-3-319-15129-8_16">10.1007/978-3-319-15129-8_16</a>.
  short: 'J.V. Erler, S. Machunsky, S. Franke, P. Grimm, H.-J. Schmid, U.A. Peuker,
    in: Colloid Process Engineering, Cham, 2015.'
date_created: 2021-10-13T13:56:51Z
date_updated: 2022-01-06T06:57:16Z
doi: 10.1007/978-3-319-15129-8_16
language:
- iso: eng
place: Cham
publication: Colloid Process Engineering
publication_status: published
status: public
title: Process Development of a Liquid-Liquid Phase Transfer of Colloidal Particles
  for Production of High-Quality Organosols
type: book_chapter
user_id: '70093'
year: '2015'
...
---
_id: '26121'
abstract:
- lang: eng
  text: The conditioning of the aerosol particle population into a bipolar charge
    equilibrium is an essential prerequisite to calculate the particle number size
    distribution using mobility particle size spectrometers. This is commonly realized
    by diffusion charging of bipolar air ions generated by e.g. a 85Kr source. Because
    of strict legal regulations on radioactive sources in several countries, soft-X-ray
    (SXR) appears as a suitable alternative. However, multiple measurements showed
    a systematical and significant difference between the particle charge distribution
    delivered by a radioactive source and an SXR charger, respectively. In this investigation,
    a calibrated particle charge distribution, suitable for the SXR chargers, was
    calculated based on the Fuchs model. An approximation analogous to the commonly
    used Wiedensohler approximation formula (Wiedensohler, 1988) was computed. The
    use of the new SXR approximation of the bipolar charge equilibrium for the inversion
    of an electrical mobility distribution to a particle number size distribution
    improves the comparability of these results, compared to measurements involving
    a 85Kr charger or to bipolar chargers using radioactive material in general. A
    systematic error in case of using the SXR charger could be eliminated and hence
    the root mean square deviation could be reduced from 13% using the common parameters
    for both charger types to 7% using the new SXR approximation for the SXR bipolar
    charger.
author:
- first_name: L.
  full_name: Tigges, L.
  last_name: Tigges
- first_name: A.
  full_name: Wiedensohler, A.
  last_name: Wiedensohler
- first_name: K.
  full_name: Weinhold, K.
  last_name: Weinhold
- first_name: J.
  full_name: Gandhi, J.
  last_name: Gandhi
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
citation:
  ama: Tigges L, Wiedensohler A, Weinhold K, Gandhi J, Schmid H-J. Bipolar charge
    distribution of a soft X-ray diffusion charger. <i>Journal of Aerosol Science</i>.
    Published online 2015:77-86. doi:<a href="https://doi.org/10.1016/j.jaerosci.2015.07.002">10.1016/j.jaerosci.2015.07.002</a>
  apa: Tigges, L., Wiedensohler, A., Weinhold, K., Gandhi, J., &#38; Schmid, H.-J.
    (2015). Bipolar charge distribution of a soft X-ray diffusion charger. <i>Journal
    of Aerosol Science</i>, 77–86. <a href="https://doi.org/10.1016/j.jaerosci.2015.07.002">https://doi.org/10.1016/j.jaerosci.2015.07.002</a>
  bibtex: '@article{Tigges_Wiedensohler_Weinhold_Gandhi_Schmid_2015, title={Bipolar
    charge distribution of a soft X-ray diffusion charger}, DOI={<a href="https://doi.org/10.1016/j.jaerosci.2015.07.002">10.1016/j.jaerosci.2015.07.002</a>},
    journal={Journal of Aerosol Science}, author={Tigges, L. and Wiedensohler, A.
    and Weinhold, K. and Gandhi, J. and Schmid, Hans-Joachim}, year={2015}, pages={77–86}
    }'
  chicago: Tigges, L., A. Wiedensohler, K. Weinhold, J. Gandhi, and Hans-Joachim Schmid.
    “Bipolar Charge Distribution of a Soft X-Ray Diffusion Charger.” <i>Journal of
    Aerosol Science</i>, 2015, 77–86. <a href="https://doi.org/10.1016/j.jaerosci.2015.07.002">https://doi.org/10.1016/j.jaerosci.2015.07.002</a>.
  ieee: 'L. Tigges, A. Wiedensohler, K. Weinhold, J. Gandhi, and H.-J. Schmid, “Bipolar
    charge distribution of a soft X-ray diffusion charger,” <i>Journal of Aerosol
    Science</i>, pp. 77–86, 2015, doi: <a href="https://doi.org/10.1016/j.jaerosci.2015.07.002">10.1016/j.jaerosci.2015.07.002</a>.'
  mla: Tigges, L., et al. “Bipolar Charge Distribution of a Soft X-Ray Diffusion Charger.”
    <i>Journal of Aerosol Science</i>, 2015, pp. 77–86, doi:<a href="https://doi.org/10.1016/j.jaerosci.2015.07.002">10.1016/j.jaerosci.2015.07.002</a>.
  short: L. Tigges, A. Wiedensohler, K. Weinhold, J. Gandhi, H.-J. Schmid, Journal
    of Aerosol Science (2015) 77–86.
date_created: 2021-10-13T13:59:35Z
date_updated: 2022-01-06T06:57:16Z
doi: 10.1016/j.jaerosci.2015.07.002
language:
- iso: eng
page: 77-86
publication: Journal of Aerosol Science
publication_identifier:
  issn:
  - 0021-8502
publication_status: published
status: public
title: Bipolar charge distribution of a soft X-ray diffusion charger
type: journal_article
user_id: '70093'
year: '2015'
...
---
_id: '26122'
abstract:
- lang: eng
  text: "An essential part of mobility particle size spectroscopy is the prediction
    of the aerosol charge distribution in a highly concentrated bipolar ion environment.
    This charge distribution can be readily calculated, but is depending on several
    environmental conditions. These influences are investigated theoretically.\r\n\r\nThe
    first part of this work deals with a sensitivity analysis using the Fuchs model
    (Fuchs, 1963) to determine the variation of the resulting charge distributions
    depending on the input parameters. It is demonstrated, that the main influencing
    variable is the difference between the positive and negative ion mobility. A sensitivity
    analysis reveals that a reasonable variation of the ion mobilities may lead to
    variations of the particle density distribution up to±20%.\r\n\r\nThe second part
    investigates the evolution of the charge distribution along the tubing downstream
    of the bipolar charger exit starting with equal ion concentrations for positive
    and negative ions. Due to wall losses depending on ion mobility a non-equilibrium
    charge distribution is developing along the plumbing. The evolution of the particle
    charge distribution is determined using a coupled population balance model. Even
    though the non-equilibrium character is clearly shown, it turns out that this
    effect is negligible at conditions typical for particle size measurements."
author:
- first_name: L.
  full_name: Tigges, L.
  last_name: Tigges
- first_name: A.
  full_name: Jain, A.
  last_name: Jain
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
citation:
  ama: 'Tigges L, Jain A, Schmid H-J. On the bipolar charge distribution used for
    mobility particle sizing: Theoretical considerations. <i>Journal of Aerosol Science</i>.
    Published online 2015:119-134. doi:<a href="https://doi.org/10.1016/j.jaerosci.2015.05.010">10.1016/j.jaerosci.2015.05.010</a>'
  apa: 'Tigges, L., Jain, A., &#38; Schmid, H.-J. (2015). On the bipolar charge distribution
    used for mobility particle sizing: Theoretical considerations. <i>Journal of Aerosol
    Science</i>, 119–134. <a href="https://doi.org/10.1016/j.jaerosci.2015.05.010">https://doi.org/10.1016/j.jaerosci.2015.05.010</a>'
  bibtex: '@article{Tigges_Jain_Schmid_2015, title={On the bipolar charge distribution
    used for mobility particle sizing: Theoretical considerations}, DOI={<a href="https://doi.org/10.1016/j.jaerosci.2015.05.010">10.1016/j.jaerosci.2015.05.010</a>},
    journal={Journal of Aerosol Science}, author={Tigges, L. and Jain, A. and Schmid,
    Hans-Joachim}, year={2015}, pages={119–134} }'
  chicago: 'Tigges, L., A. Jain, and Hans-Joachim Schmid. “On the Bipolar Charge Distribution
    Used for Mobility Particle Sizing: Theoretical Considerations.” <i>Journal of
    Aerosol Science</i>, 2015, 119–34. <a href="https://doi.org/10.1016/j.jaerosci.2015.05.010">https://doi.org/10.1016/j.jaerosci.2015.05.010</a>.'
  ieee: 'L. Tigges, A. Jain, and H.-J. Schmid, “On the bipolar charge distribution
    used for mobility particle sizing: Theoretical considerations,” <i>Journal of
    Aerosol Science</i>, pp. 119–134, 2015, doi: <a href="https://doi.org/10.1016/j.jaerosci.2015.05.010">10.1016/j.jaerosci.2015.05.010</a>.'
  mla: 'Tigges, L., et al. “On the Bipolar Charge Distribution Used for Mobility Particle
    Sizing: Theoretical Considerations.” <i>Journal of Aerosol Science</i>, 2015,
    pp. 119–34, doi:<a href="https://doi.org/10.1016/j.jaerosci.2015.05.010">10.1016/j.jaerosci.2015.05.010</a>.'
  short: L. Tigges, A. Jain, H.-J. Schmid, Journal of Aerosol Science (2015) 119–134.
date_created: 2021-10-13T14:01:06Z
date_updated: 2022-01-06T06:57:16Z
doi: 10.1016/j.jaerosci.2015.05.010
language:
- iso: eng
page: 119-134
publication: Journal of Aerosol Science
publication_identifier:
  issn:
  - 0021-8502
publication_status: published
status: public
title: 'On the bipolar charge distribution used for mobility particle sizing: Theoretical
  considerations'
type: journal_article
user_id: '70093'
year: '2015'
...
---
_id: '26123'
abstract:
- lang: eng
  text: "The precipitation of sticky and ultrafine particles has become increasingly
    important. Biomass burners are one important example for ultrafine dust emission
    sources with ever growing importance. Therefore, a baghouse filter has been developed,
    which combines excellent separation efficiency (> 99%, clean air dust loading
    of < 1 mg/m3) with convenience in operation. However, in order to prevent clogging
    of the filter cloth by sticky and ultrafine particles, it is necessary to use
    a precoat layer (e.g. hydrated limestone powder). If this technology is applied
    to larger scale processes, e.g. biomass burning for industrial drying processes,
    the reuse of the precoat material can generate significant savings.\r\n\r\nTherefore,
    extended tests on recycling of used precoat material have been performed. Particularly,
    the influence of precoat injection parameters and various mixing strategies of
    used and virgin powder for refreshing the precoat material have been investigated.
    Different mixtures have been characterised by their ability to disintegrate, flowability
    and filtration behaviour. It is clearly demonstrated that upon redispersing the
    used precoat fine dust mainly adheres to the coarse precoat with only a limited
    number of dust agglomerates being produced in addition. For each kind of precoat
    a minimum amount is determined in order to ensure a long-term stable process.
    This way a saving potential of between 40–67% has been found.\r\n\r\nAn economic
    and ecologic process has been developed to precipitate ultrafine dust in a baghouse
    filter system using precoat materials."
author:
- first_name: Sascha
  full_name: Schiller, Sascha
  last_name: Schiller
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
citation:
  ama: Schiller S, Schmid H-J. Highly efficient filtration of ultrafine dust in baghouse
    filters using precoat materials. <i>Powder Technology</i>. Published online 2015:96-105.
    doi:<a href="https://doi.org/10.1016/j.powtec.2015.03.048">10.1016/j.powtec.2015.03.048</a>
  apa: Schiller, S., &#38; Schmid, H.-J. (2015). Highly efficient filtration of ultrafine
    dust in baghouse filters using precoat materials. <i>Powder Technology</i>, 96–105.
    <a href="https://doi.org/10.1016/j.powtec.2015.03.048">https://doi.org/10.1016/j.powtec.2015.03.048</a>
  bibtex: '@article{Schiller_Schmid_2015, title={Highly efficient filtration of ultrafine
    dust in baghouse filters using precoat materials}, DOI={<a href="https://doi.org/10.1016/j.powtec.2015.03.048">10.1016/j.powtec.2015.03.048</a>},
    journal={Powder Technology}, author={Schiller, Sascha and Schmid, Hans-Joachim},
    year={2015}, pages={96–105} }'
  chicago: Schiller, Sascha, and Hans-Joachim Schmid. “Highly Efficient Filtration
    of Ultrafine Dust in Baghouse Filters Using Precoat Materials.” <i>Powder Technology</i>,
    2015, 96–105. <a href="https://doi.org/10.1016/j.powtec.2015.03.048">https://doi.org/10.1016/j.powtec.2015.03.048</a>.
  ieee: 'S. Schiller and H.-J. Schmid, “Highly efficient filtration of ultrafine dust
    in baghouse filters using precoat materials,” <i>Powder Technology</i>, pp. 96–105,
    2015, doi: <a href="https://doi.org/10.1016/j.powtec.2015.03.048">10.1016/j.powtec.2015.03.048</a>.'
  mla: Schiller, Sascha, and Hans-Joachim Schmid. “Highly Efficient Filtration of
    Ultrafine Dust in Baghouse Filters Using Precoat Materials.” <i>Powder Technology</i>,
    2015, pp. 96–105, doi:<a href="https://doi.org/10.1016/j.powtec.2015.03.048">10.1016/j.powtec.2015.03.048</a>.
  short: S. Schiller, H.-J. Schmid, Powder Technology (2015) 96–105.
date_created: 2021-10-13T14:03:48Z
date_updated: 2022-01-06T06:57:16Z
doi: 10.1016/j.powtec.2015.03.048
language:
- iso: eng
page: 96-105
publication: Powder Technology
publication_identifier:
  issn:
  - 0032-5910
publication_status: published
status: public
title: Highly efficient filtration of ultrafine dust in baghouse filters using precoat
  materials
type: journal_article
user_id: '70093'
year: '2015'
...
---
_id: '26124'
abstract:
- lang: eng
  text: Capillary forces between particles often dominate other adhesion forces. However,
    the calculation of the shape of capillary bridges and the resulting force is complex,
    so often assumptions and approximations are used. These assumptions are not useful
    for nanoscale particles. Therefore, a simulation method was established to calculate
    numerically the shape of the meniscus and derive the corresponding capillary bridge
    force. The main focus are nanoscaled particles with liquid bridges formed by condensing
    air humidity. The dependence of the capillary force on various parameters such
    as particle sizes, contact angle and humidity was investigated and it is demonstrated
    that often-used assumptions cannot be used for nanoscaled particles without remarkable
    mistake.
author:
- first_name: Michael
  full_name: Dörmann, Michael
  last_name: Dörmann
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
citation:
  ama: Dörmann M, Schmid H-J. Simulation of Capillary Bridges between Particles. <i>Procedia
    Engineering</i>. Published online 2015:14-23. doi:<a href="https://doi.org/10.1016/j.proeng.2015.01.102">10.1016/j.proeng.2015.01.102</a>
  apa: Dörmann, M., &#38; Schmid, H.-J. (2015). Simulation of Capillary Bridges between
    Particles. <i>Procedia Engineering</i>, 14–23. <a href="https://doi.org/10.1016/j.proeng.2015.01.102">https://doi.org/10.1016/j.proeng.2015.01.102</a>
  bibtex: '@article{Dörmann_Schmid_2015, title={Simulation of Capillary Bridges between
    Particles}, DOI={<a href="https://doi.org/10.1016/j.proeng.2015.01.102">10.1016/j.proeng.2015.01.102</a>},
    journal={Procedia Engineering}, author={Dörmann, Michael and Schmid, Hans-Joachim},
    year={2015}, pages={14–23} }'
  chicago: Dörmann, Michael, and Hans-Joachim Schmid. “Simulation of Capillary Bridges
    between Particles.” <i>Procedia Engineering</i>, 2015, 14–23. <a href="https://doi.org/10.1016/j.proeng.2015.01.102">https://doi.org/10.1016/j.proeng.2015.01.102</a>.
  ieee: 'M. Dörmann and H.-J. Schmid, “Simulation of Capillary Bridges between Particles,”
    <i>Procedia Engineering</i>, pp. 14–23, 2015, doi: <a href="https://doi.org/10.1016/j.proeng.2015.01.102">10.1016/j.proeng.2015.01.102</a>.'
  mla: Dörmann, Michael, and Hans-Joachim Schmid. “Simulation of Capillary Bridges
    between Particles.” <i>Procedia Engineering</i>, 2015, pp. 14–23, doi:<a href="https://doi.org/10.1016/j.proeng.2015.01.102">10.1016/j.proeng.2015.01.102</a>.
  short: M. Dörmann, H.-J. Schmid, Procedia Engineering (2015) 14–23.
date_created: 2021-10-13T14:04:42Z
date_updated: 2022-01-06T06:57:16Z
doi: 10.1016/j.proeng.2015.01.102
language:
- iso: eng
page: 14-23
publication: Procedia Engineering
publication_identifier:
  issn:
  - 1877-7058
publication_status: published
status: public
title: Simulation of Capillary Bridges between Particles
type: journal_article
user_id: '70093'
year: '2015'
...
---
_id: '22178'
author:
- first_name: Patrick
  full_name: Delfs, Patrick
  last_name: Delfs
- first_name: Z.
  full_name: Li, Z.
  last_name: Li
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
citation:
  ama: 'Delfs P, Li Z, Schmid H-J. Mass finishing of laser sintered parts. In: <i>26th
    Annual International Solid Freeform Fabrication Symposium</i>. Vol 26. ; 2015:514-526.
    doi:<a href="http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-41-Delfs.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-41-Delfs.pdf</a>'
  apa: Delfs, P., Li, Z., &#38; Schmid, H.-J. (2015). Mass finishing of laser sintered
    parts. In <i>26th Annual International Solid Freeform Fabrication Symposium</i>
    (Vol. 26, pp. 514–526). <a href="http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-41-Delfs.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-41-Delfs.pdf</a>
  bibtex: '@inproceedings{Delfs_Li_Schmid_2015, title={Mass finishing of laser sintered
    parts}, volume={26}, DOI={<a href="http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-41-Delfs.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-41-Delfs.pdf</a>},
    booktitle={26th Annual International Solid Freeform Fabrication Symposium}, author={Delfs,
    Patrick and Li, Z. and Schmid, Hans-Joachim}, year={2015}, pages={514–526} }'
  chicago: Delfs, Patrick, Z. Li, and Hans-Joachim Schmid. “Mass Finishing of Laser
    Sintered Parts.” In <i>26th Annual International Solid Freeform Fabrication Symposium</i>,
    26:514–26, 2015. <a href="http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-41-Delfs.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-41-Delfs.pdf</a>.
  ieee: P. Delfs, Z. Li, and H.-J. Schmid, “Mass finishing of laser sintered parts,”
    in <i>26th Annual International Solid Freeform Fabrication Symposium</i>, 2015,
    vol. 26, pp. 514–526.
  mla: Delfs, Patrick, et al. “Mass Finishing of Laser Sintered Parts.” <i>26th Annual
    International Solid Freeform Fabrication Symposium</i>, vol. 26, 2015, pp. 514–26,
    doi:<a href="http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-41-Delfs.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-41-Delfs.pdf</a>.
  short: 'P. Delfs, Z. Li, H.-J. Schmid, in: 26th Annual International Solid Freeform
    Fabrication Symposium, 2015, pp. 514–526.'
date_created: 2021-05-14T07:46:07Z
date_updated: 2022-01-06T06:55:28Z
department:
- _id: '150'
- _id: '624'
- _id: '219'
doi: http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-41-Delfs.pdf
intvolume: '        26'
language:
- iso: eng
page: 514-526
publication: 26th Annual International Solid Freeform Fabrication Symposium
status: public
title: Mass finishing of laser sintered parts
type: conference
user_id: '71545'
volume: 26
year: '2015'
...
---
_id: '22179'
abstract:
- lang: eng
  text: The temperature distribution and history within laser sintered part cakes
    is an important aspect regarding the process quality and reproducibility of the
    polymer laser sintering process. Especially the temperature history during the
    build and cooling phase is decisive for powder ageing effects and the development
    of part quality characteristics. In this work, a measurement system for three-dimensional
    in-process temperature measurements is set up and the influence of different parameters
    on the inner part cake temperature distribution and history is analyzed. Important
    factors are not only geometrical build job parameters like the part packing density
    and build height, but also process parameters like the layer thickness and bulk
    powder density. Individual in-process temperature profiles at different positions
    within a part cake are finally correlated with powder ageing effects. The results
    of this work help to understand the temperature history dependency of powder and
    part properties and can therefore be used to develop optimized process controls.
author:
- first_name: Stefan
  full_name: Josupeit, Stefan
  last_name: Josupeit
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
citation:
  ama: 'Josupeit S, Schmid H-J. Temperature History within Laser Sintered Part Cakes
    and its Influence on Process Quality. In: <i>26th Annual International Solid Freeform
    Fabrication Symposium</i>. Vol 26. ; 2015:190-199. doi:<a href="http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-15-Josupeit.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-15-Josupeit.pdf</a>'
  apa: Josupeit, S., &#38; Schmid, H.-J. (2015). Temperature History within Laser
    Sintered Part Cakes and its Influence on Process Quality. In <i>26th Annual International
    Solid Freeform Fabrication Symposium</i> (Vol. 26, pp. 190–199). <a href="http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-15-Josupeit.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-15-Josupeit.pdf</a>
  bibtex: '@inproceedings{Josupeit_Schmid_2015, title={Temperature History within
    Laser Sintered Part Cakes and its Influence on Process Quality}, volume={26},
    DOI={<a href="http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-15-Josupeit.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-15-Josupeit.pdf</a>},
    booktitle={26th Annual International Solid Freeform Fabrication Symposium}, author={Josupeit,
    Stefan and Schmid, Hans-Joachim}, year={2015}, pages={190–199} }'
  chicago: Josupeit, Stefan, and Hans-Joachim Schmid. “Temperature History within
    Laser Sintered Part Cakes and Its Influence on Process Quality.” In <i>26th Annual
    International Solid Freeform Fabrication Symposium</i>, 26:190–99, 2015. <a href="http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-15-Josupeit.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-15-Josupeit.pdf</a>.
  ieee: S. Josupeit and H.-J. Schmid, “Temperature History within Laser Sintered Part
    Cakes and its Influence on Process Quality,” in <i>26th Annual International Solid
    Freeform Fabrication Symposium</i>, 2015, vol. 26, pp. 190–199.
  mla: Josupeit, Stefan, and Hans-Joachim Schmid. “Temperature History within Laser
    Sintered Part Cakes and Its Influence on Process Quality.” <i>26th Annual International
    Solid Freeform Fabrication Symposium</i>, vol. 26, 2015, pp. 190–99, doi:<a href="http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-15-Josupeit.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-15-Josupeit.pdf</a>.
  short: 'S. Josupeit, H.-J. Schmid, in: 26th Annual International Solid Freeform
    Fabrication Symposium, 2015, pp. 190–199.'
date_created: 2021-05-14T07:46:09Z
date_updated: 2022-01-06T06:55:28Z
department:
- _id: '150'
- _id: '624'
- _id: '219'
doi: http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-15-Josupeit.pdf
intvolume: '        26'
language:
- iso: eng
page: 190-199
publication: 26th Annual International Solid Freeform Fabrication Symposium
status: public
title: Temperature History within Laser Sintered Part Cakes and its Influence on Process
  Quality
type: conference
user_id: '71545'
volume: 26
year: '2015'
...
---
_id: '22187'
abstract:
- lang: eng
  text: Due to long process times at high temperatures, unmolten polyamide 12 material
    ages during the manufacturing process. Hence, it needs to be refreshed with new
    material for further build cycles. In application, refresh rates of about 50 %
    are commonly used. In this work, the recycling optimized material PA 2221 from
    EOS is analyzed along a series of 13 build and refresh cycles using a reduced
    refresh rate of 32 %. Before and after every build, the powder is analyzed regarding
    melt properties determined by MVR and DSC measurements. Thereby, in-process ageing
    effects are investigated and the steady-state conditions are determined accordingly.
    In addition, powder properties are directly linked to resulting mechanical and
    geometrical part properties. Key findings are a robust DSC measurement method
    for polyamide 12 powder, constant “circulated” material properties after three
    build/refresh cycles and robust tensile properties along the whole tested powder
    life cycle. As a result, process conditions of PA 2221 using reduced refresh rates
    can be derived from this work.
author:
- first_name: Stefan
  full_name: Josupeit, Stefan
  last_name: Josupeit
- first_name: Johannes
  full_name: Lohn, Johannes
  last_name: Lohn
- first_name: E.
  full_name: Hermann, E.
  last_name: Hermann
- first_name: Monika
  full_name: Gessler, Monika
  last_name: Gessler
- first_name: S.
  full_name: Tenbrink, S.
  last_name: Tenbrink
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
citation:
  ama: 'Josupeit S, Lohn J, Hermann E, Gessler M, Tenbrink S, Schmid H-J. Material
    Properties of Laser Sintered Polyamide 12 as Function of Build Cycles Using Low
    Refresh Rates. In: <i>26th Annual International Solid Freeform Fabrication Symposium</i>.
    Vol 26. ; 2015:540-549. doi:<a href="http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-43-Josupeit.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-43-Josupeit.pdf</a>'
  apa: Josupeit, S., Lohn, J., Hermann, E., Gessler, M., Tenbrink, S., &#38; Schmid,
    H.-J. (2015). Material Properties of Laser Sintered Polyamide 12 as Function of
    Build Cycles Using Low Refresh Rates. In <i>26th Annual International Solid Freeform
    Fabrication Symposium</i> (Vol. 26, pp. 540–549). <a href="http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-43-Josupeit.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-43-Josupeit.pdf</a>
  bibtex: '@inproceedings{Josupeit_Lohn_Hermann_Gessler_Tenbrink_Schmid_2015, title={Material
    Properties of Laser Sintered Polyamide 12 as Function of Build Cycles Using Low
    Refresh Rates}, volume={26}, DOI={<a href="http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-43-Josupeit.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-43-Josupeit.pdf</a>},
    booktitle={26th Annual International Solid Freeform Fabrication Symposium}, author={Josupeit,
    Stefan and Lohn, Johannes and Hermann, E. and Gessler, Monika and Tenbrink, S.
    and Schmid, Hans-Joachim}, year={2015}, pages={540–549} }'
  chicago: Josupeit, Stefan, Johannes Lohn, E. Hermann, Monika Gessler, S. Tenbrink,
    and Hans-Joachim Schmid. “Material Properties of Laser Sintered Polyamide 12 as
    Function of Build Cycles Using Low Refresh Rates.” In <i>26th Annual International
    Solid Freeform Fabrication Symposium</i>, 26:540–49, 2015. <a href="http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-43-Josupeit.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-43-Josupeit.pdf</a>.
  ieee: S. Josupeit, J. Lohn, E. Hermann, M. Gessler, S. Tenbrink, and H.-J. Schmid,
    “Material Properties of Laser Sintered Polyamide 12 as Function of Build Cycles
    Using Low Refresh Rates,” in <i>26th Annual International Solid Freeform Fabrication
    Symposium</i>, 2015, vol. 26, pp. 540–549.
  mla: Josupeit, Stefan, et al. “Material Properties of Laser Sintered Polyamide 12
    as Function of Build Cycles Using Low Refresh Rates.” <i>26th Annual International
    Solid Freeform Fabrication Symposium</i>, vol. 26, 2015, pp. 540–49, doi:<a href="http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-43-Josupeit.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-43-Josupeit.pdf</a>.
  short: 'S. Josupeit, J. Lohn, E. Hermann, M. Gessler, S. Tenbrink, H.-J. Schmid,
    in: 26th Annual International Solid Freeform Fabrication Symposium, 2015, pp.
    540–549.'
date_created: 2021-05-14T07:46:18Z
date_updated: 2022-01-06T06:55:28Z
department:
- _id: '150'
- _id: '624'
- _id: '219'
doi: http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-43-Josupeit.pdf
intvolume: '        26'
language:
- iso: eng
page: 540-549
publication: 26th Annual International Solid Freeform Fabrication Symposium
status: public
title: Material Properties of Laser Sintered Polyamide 12 as Function of Build Cycles
  Using Low Refresh Rates
type: conference
user_id: '71545'
volume: 26
year: '2015'
...
---
_id: '22189'
abstract:
- lang: eng
  text: The layered structure of Additive Manufacturing processes results in a stairstepping
    effect of the surface topographies. In general the impact of this effect strongly
    depends on the build angle of a surface, whereas the overall surface roughness
    is caused by the resolution of the specific AM process. The aim of this work is
    the prediction of the surface quality in dependence of the building orientation
    of a part. These results can finally be used to optimize the orientation to get
    a desired surface quality. As not every area of a part can be optimized, a predetermination
    of areas can be used to improve the surface quality of important areas. The model
    uses the digital STL format of a part as this is necessary for all AM machines
    to build it. Each triangle is assigned with a roughness value and by testing different
    orientations the best one can be found. This approach needs a database for the
    surface qualities. This must be done separately for each Additive Manufacturing
    process and is shown exemplary with a surface topography simulation for the laser
    sintering process.
author:
- first_name: Patrick
  full_name: Delfs, Patrick
  last_name: Delfs
- first_name: Marcel
  full_name: Toews, Marcel
  last_name: Toews
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
citation:
  ama: 'Delfs P, Toews M, Schmid H-J. Surface roughness optimized alignment of parts
    for additive manufacturing processes. In: <i>26th Annual International Solid Freeform
    Fabrication Symposium</i>. Vol 26. ; 2015:1334-1344. doi:<a href="http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-107-Delfs.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-107-Delfs.pdf</a>'
  apa: Delfs, P., Toews, M., &#38; Schmid, H.-J. (2015). Surface roughness optimized
    alignment of parts for additive manufacturing processes. In <i>26th Annual International
    Solid Freeform Fabrication Symposium</i> (Vol. 26, pp. 1334–1344). <a href="http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-107-Delfs.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-107-Delfs.pdf</a>
  bibtex: '@inproceedings{Delfs_Toews_Schmid_2015, title={Surface roughness optimized
    alignment of parts for additive manufacturing processes}, volume={26}, DOI={<a
    href="http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-107-Delfs.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-107-Delfs.pdf</a>},
    booktitle={26th Annual International Solid Freeform Fabrication Symposium}, author={Delfs,
    Patrick and Toews, Marcel and Schmid, Hans-Joachim}, year={2015}, pages={1334–1344}
    }'
  chicago: Delfs, Patrick, Marcel Toews, and Hans-Joachim Schmid. “Surface Roughness
    Optimized Alignment of Parts for Additive Manufacturing Processes.” In <i>26th
    Annual International Solid Freeform Fabrication Symposium</i>, 26:1334–44, 2015.
    <a href="http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-107-Delfs.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-107-Delfs.pdf</a>.
  ieee: P. Delfs, M. Toews, and H.-J. Schmid, “Surface roughness optimized alignment
    of parts for additive manufacturing processes,” in <i>26th Annual International
    Solid Freeform Fabrication Symposium</i>, 2015, vol. 26, pp. 1334–1344.
  mla: Delfs, Patrick, et al. “Surface Roughness Optimized Alignment of Parts for
    Additive Manufacturing Processes.” <i>26th Annual International Solid Freeform
    Fabrication Symposium</i>, vol. 26, 2015, pp. 1334–44, doi:<a href="http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-107-Delfs.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-107-Delfs.pdf</a>.
  short: 'P. Delfs, M. Toews, H.-J. Schmid, in: 26th Annual International Solid Freeform
    Fabrication Symposium, 2015, pp. 1334–1344.'
date_created: 2021-05-14T07:46:20Z
date_updated: 2022-01-06T06:55:28Z
department:
- _id: '150'
- _id: '624'
- _id: '219'
doi: http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-107-Delfs.pdf
intvolume: '        26'
language:
- iso: eng
page: 1334-1344
publication: 26th Annual International Solid Freeform Fabrication Symposium
status: public
title: Surface roughness optimized alignment of parts for additive manufacturing processes
type: conference
user_id: '71545'
volume: 26
year: '2015'
...
---
_id: '22199'
abstract:
- lang: eng
  text: Powder ageing effects due to thermal load usually lead to a limited recyclability
    of unmolten polyamide 12 powders in the laser sintering process. In this work,
    the recycling optimized material PA 2221 is analyzed regarding its ageing behavior
    along a series of more than ten build/refresh cycles using a refresh ratio of
    about 30%. Thereby, the melt viscosity is measured before and after every cycle
    and the “steady-state” condition is determined accordingly. In addition, the material
    properties of parts manufactured with PA 2221 are discussed dependent on different
    process parameters and compared to parts made of standard PA 2200 material with
    a refresh rate of about 50%. These parameters include the mechanical properties
    as well as for example the impact strength and geometrical properties as function
    of layer thickness and testing temperature. As a result, the optimal process conditions
    and achievable material properties for PA 2221 can be derived from this work.
author:
- first_name: Stefan
  full_name: Josupeit, Stefan
  last_name: Josupeit
- first_name: S.
  full_name: Tutzschky, S.
  last_name: Tutzschky
- first_name: M.
  full_name: Gessler, M.
  last_name: Gessler
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
citation:
  ama: 'Josupeit S, Tutzschky S, Gessler M, Schmid H-J. Powder ageing and material
    properties of laser sintered polyamide 12 using low refresh rates. In: <i>Proceedings
    of the Rapid Tech 2015</i>. Springer Vieweg; 2015:63-78. doi:<a href="https://doi.org/10.1007/978-3-662-48473-9_5">10.1007/978-3-662-48473-9_5</a>'
  apa: Josupeit, S., Tutzschky, S., Gessler, M., &#38; Schmid, H.-J. (2015). Powder
    ageing and material properties of laser sintered polyamide 12 using low refresh
    rates. In <i>Proceedings of the Rapid Tech 2015</i> (pp. 63–78). Springer Vieweg.
    <a href="https://doi.org/10.1007/978-3-662-48473-9_5">https://doi.org/10.1007/978-3-662-48473-9_5</a>
  bibtex: '@inproceedings{Josupeit_Tutzschky_Gessler_Schmid_2015, title={Powder ageing
    and material properties of laser sintered polyamide 12 using low refresh rates},
    DOI={<a href="https://doi.org/10.1007/978-3-662-48473-9_5">10.1007/978-3-662-48473-9_5</a>},
    booktitle={Proceedings of the Rapid Tech 2015}, publisher={Springer Vieweg}, author={Josupeit,
    Stefan and Tutzschky, S. and Gessler, M. and Schmid, Hans-Joachim}, year={2015},
    pages={63–78} }'
  chicago: Josupeit, Stefan, S. Tutzschky, M. Gessler, and Hans-Joachim Schmid. “Powder
    Ageing and Material Properties of Laser Sintered Polyamide 12 Using Low Refresh
    Rates.” In <i>Proceedings of the Rapid Tech 2015</i>, 63–78. Springer Vieweg,
    2015. <a href="https://doi.org/10.1007/978-3-662-48473-9_5">https://doi.org/10.1007/978-3-662-48473-9_5</a>.
  ieee: S. Josupeit, S. Tutzschky, M. Gessler, and H.-J. Schmid, “Powder ageing and
    material properties of laser sintered polyamide 12 using low refresh rates,” in
    <i>Proceedings of the Rapid Tech 2015</i>, 2015, pp. 63–78.
  mla: Josupeit, Stefan, et al. “Powder Ageing and Material Properties of Laser Sintered
    Polyamide 12 Using Low Refresh Rates.” <i>Proceedings of the Rapid Tech 2015</i>,
    Springer Vieweg, 2015, pp. 63–78, doi:<a href="https://doi.org/10.1007/978-3-662-48473-9_5">10.1007/978-3-662-48473-9_5</a>.
  short: 'S. Josupeit, S. Tutzschky, M. Gessler, H.-J. Schmid, in: Proceedings of
    the Rapid Tech 2015, Springer Vieweg, 2015, pp. 63–78.'
date_created: 2021-05-14T07:46:32Z
date_updated: 2022-01-06T06:55:28Z
department:
- _id: '150'
- _id: '624'
- _id: '219'
doi: 10.1007/978-3-662-48473-9_5
language:
- iso: eng
page: 63-78
publication: Proceedings of the Rapid Tech 2015
publication_identifier:
  isbn:
  - 978-3-662-48473-9
publisher: Springer Vieweg
status: public
title: Powder ageing and material properties of laser sintered polyamide 12 using
  low refresh rates
type: conference
user_id: '71545'
year: '2015'
...
---
_id: '23074'
author:
- first_name: Isabel
  full_name: Koke, Isabel
  last_name: Koke
- first_name: Katharina
  full_name: Dibblee, Katharina
  last_name: Dibblee
- first_name: Frederik
  full_name: Hankeln, Frederik
  last_name: Hankeln
- first_name: Stefan
  full_name: Seidel, Stefan
  last_name: Seidel
- first_name: Ansgar
  full_name: Trächtler, Ansgar
  id: '552'
  last_name: Trächtler
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
citation:
  ama: 'Koke I, Dibblee K, Hankeln F, Seidel S, Trächtler A, Schmid H-J. Tutorenprogramm
    und Vertiefungsberatung stellen Weichen in entscheidenden Phasen des Student Life-Cycles
    in Maschinenbaustudiengängen. In: <i> 44. Jahrestagung Der Deutschen Gesellschaft
    Für Hochschuldidaktik - Hochschuldidaktik Im Dialog, Paderborn</i>. ; 2015.'
  apa: Koke, I., Dibblee, K., Hankeln, F., Seidel, S., Trächtler, A., &#38; Schmid,
    H.-J. (2015). Tutorenprogramm und Vertiefungsberatung stellen Weichen in entscheidenden
    Phasen des Student Life-Cycles in Maschinenbaustudiengängen. In <i> 44. Jahrestagung
    der Deutschen Gesellschaft für Hochschuldidaktik - Hochschuldidaktik im Dialog,
    Paderborn</i>.
  bibtex: '@inproceedings{Koke_Dibblee_Hankeln_Seidel_Trächtler_Schmid_2015, title={Tutorenprogramm
    und Vertiefungsberatung stellen Weichen in entscheidenden Phasen des Student Life-Cycles
    in Maschinenbaustudiengängen}, booktitle={ 44. Jahrestagung der Deutschen Gesellschaft
    für Hochschuldidaktik - Hochschuldidaktik im Dialog, Paderborn}, author={Koke,
    Isabel and Dibblee, Katharina and Hankeln, Frederik and Seidel, Stefan and Trächtler,
    Ansgar and Schmid, Hans-Joachim}, year={2015} }'
  chicago: Koke, Isabel, Katharina Dibblee, Frederik Hankeln, Stefan Seidel, Ansgar
    Trächtler, and Hans-Joachim Schmid. “Tutorenprogramm Und Vertiefungsberatung Stellen
    Weichen in Entscheidenden Phasen Des Student Life-Cycles in Maschinenbaustudiengängen.”
    In <i> 44. Jahrestagung Der Deutschen Gesellschaft Für Hochschuldidaktik - Hochschuldidaktik
    Im Dialog, Paderborn</i>, 2015.
  ieee: I. Koke, K. Dibblee, F. Hankeln, S. Seidel, A. Trächtler, and H.-J. Schmid,
    “Tutorenprogramm und Vertiefungsberatung stellen Weichen in entscheidenden Phasen
    des Student Life-Cycles in Maschinenbaustudiengängen,” in <i> 44. Jahrestagung
    der Deutschen Gesellschaft für Hochschuldidaktik - Hochschuldidaktik im Dialog,
    Paderborn</i>, 2015.
  mla: Koke, Isabel, et al. “Tutorenprogramm Und Vertiefungsberatung Stellen Weichen
    in Entscheidenden Phasen Des Student Life-Cycles in Maschinenbaustudiengängen.”
    <i> 44. Jahrestagung Der Deutschen Gesellschaft Für Hochschuldidaktik - Hochschuldidaktik
    Im Dialog, Paderborn</i>, 2015.
  short: 'I. Koke, K. Dibblee, F. Hankeln, S. Seidel, A. Trächtler, H.-J. Schmid,
    in:  44. Jahrestagung Der Deutschen Gesellschaft Für Hochschuldidaktik - Hochschuldidaktik
    Im Dialog, Paderborn, 2015.'
date_created: 2021-08-09T06:42:41Z
date_updated: 2022-01-06T06:55:45Z
department:
- _id: '153'
language:
- iso: eng
publication: ' 44. Jahrestagung der Deutschen Gesellschaft für Hochschuldidaktik -
  Hochschuldidaktik im Dialog, Paderborn'
status: public
title: Tutorenprogramm und Vertiefungsberatung stellen Weichen in entscheidenden Phasen
  des Student Life-Cycles in Maschinenbaustudiengängen
type: conference
user_id: '24876'
year: '2015'
...
---
_id: '26125'
abstract:
- lang: eng
  text: We investigated an explanation for the length dependence of apparent wall
    slip in capillary and slit die experiments that had been implied in earlier studies.
    Firstly, we used a very long slit die fitted with six equidistant pressure transducers
    and an adjustable outlet. It was found that, all other parameters being equal,
    the impact of pressure on the flow behavior of suspensions was not different from
    the impact on the unfilled matrix fluid. Particle-related properties, such as
    apparent wall slip, were therefore not influenced by pressure as assumed by other
    authors. Secondly, we determined wall slip velocities by both the Mooney method
    and numerical simulation, based on an implementation of Phillips constitutive
    equation for particle migration. This led to a similar length dependence of wall
    slip as had been reported in an earlier work. We concluded that this was due to
    the transient nature of particle migration and its interrelationship with apparent
    wall slip, rather than an influence of pressure.
author:
- first_name: Sven
  full_name: Pieper, Sven
  last_name: Pieper
- first_name: Nadine
  full_name: Kirchhoff, Nadine
  last_name: Kirchhoff
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
citation:
  ama: Pieper S, Kirchhoff N, Schmid H-J. Absence of pressure sensitivity of apparent
    wall slip in pressure-driven flow of non-colloidal suspensions. <i>Rheologica
    Acta</i>. Published online 2014:69-75. doi:<a href="https://doi.org/10.1007/s00397-014-0815-x">10.1007/s00397-014-0815-x</a>
  apa: Pieper, S., Kirchhoff, N., &#38; Schmid, H.-J. (2014). Absence of pressure
    sensitivity of apparent wall slip in pressure-driven flow of non-colloidal suspensions.
    <i>Rheologica Acta</i>, 69–75. <a href="https://doi.org/10.1007/s00397-014-0815-x">https://doi.org/10.1007/s00397-014-0815-x</a>
  bibtex: '@article{Pieper_Kirchhoff_Schmid_2014, title={Absence of pressure sensitivity
    of apparent wall slip in pressure-driven flow of non-colloidal suspensions}, DOI={<a
    href="https://doi.org/10.1007/s00397-014-0815-x">10.1007/s00397-014-0815-x</a>},
    journal={Rheologica Acta}, author={Pieper, Sven and Kirchhoff, Nadine and Schmid,
    Hans-Joachim}, year={2014}, pages={69–75} }'
  chicago: Pieper, Sven, Nadine Kirchhoff, and Hans-Joachim Schmid. “Absence of Pressure
    Sensitivity of Apparent Wall Slip in Pressure-Driven Flow of Non-Colloidal Suspensions.”
    <i>Rheologica Acta</i>, 2014, 69–75. <a href="https://doi.org/10.1007/s00397-014-0815-x">https://doi.org/10.1007/s00397-014-0815-x</a>.
  ieee: 'S. Pieper, N. Kirchhoff, and H.-J. Schmid, “Absence of pressure sensitivity
    of apparent wall slip in pressure-driven flow of non-colloidal suspensions,” <i>Rheologica
    Acta</i>, pp. 69–75, 2014, doi: <a href="https://doi.org/10.1007/s00397-014-0815-x">10.1007/s00397-014-0815-x</a>.'
  mla: Pieper, Sven, et al. “Absence of Pressure Sensitivity of Apparent Wall Slip
    in Pressure-Driven Flow of Non-Colloidal Suspensions.” <i>Rheologica Acta</i>,
    2014, pp. 69–75, doi:<a href="https://doi.org/10.1007/s00397-014-0815-x">10.1007/s00397-014-0815-x</a>.
  short: S. Pieper, N. Kirchhoff, H.-J. Schmid, Rheologica Acta (2014) 69–75.
date_created: 2021-10-13T14:05:58Z
date_updated: 2022-01-06T06:57:16Z
doi: 10.1007/s00397-014-0815-x
language:
- iso: eng
page: 69-75
publication: Rheologica Acta
publication_identifier:
  issn:
  - 0035-4511
  - 1435-1528
publication_status: published
status: public
title: Absence of pressure sensitivity of apparent wall slip in pressure-driven flow
  of non-colloidal suspensions
type: journal_article
user_id: '70093'
year: '2014'
...
---
_id: '26126'
abstract:
- lang: eng
  text: Ultrafine dust separation from different sources like industry, traffic, or
    private households has become increasingly important in the last decade. A compact
    baghouse filter system has been developed which is suitable for pellet heaters.
    For filtration, a precoat material is required to prevent clogging of the filter
    media by the ultrafine dust particles. In order to ensure the best performance
    of this filter system, different combinations of filter media and precoat materials,
    e.g., grade efficiencies and the cake area load for the various filter media,
    were investigated in a special test rig. With this highly efficient technology,
    extremely high separation efficiencies of > 99 % and ultrafine dust concentrations
    of > 1 mg cm−3 could be reached in a long-term stable process.
author:
- first_name: Sascha
  full_name: Schiller, Sascha
  last_name: Schiller
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
citation:
  ama: Schiller S, Schmid H-J. Ultrafine Dust Filtration Using Precoat Materials Considering
    the Influence of Filter Media. <i>Chemical Engineering &#38; Technology</i>. Published
    online 2014:1009-1020. doi:<a href="https://doi.org/10.1002/ceat.201300856">10.1002/ceat.201300856</a>
  apa: Schiller, S., &#38; Schmid, H.-J. (2014). Ultrafine Dust Filtration Using Precoat
    Materials Considering the Influence of Filter Media. <i>Chemical Engineering &#38;
    Technology</i>, 1009–1020. <a href="https://doi.org/10.1002/ceat.201300856">https://doi.org/10.1002/ceat.201300856</a>
  bibtex: '@article{Schiller_Schmid_2014, title={Ultrafine Dust Filtration Using Precoat
    Materials Considering the Influence of Filter Media}, DOI={<a href="https://doi.org/10.1002/ceat.201300856">10.1002/ceat.201300856</a>},
    journal={Chemical Engineering &#38; Technology}, author={Schiller, Sascha and
    Schmid, Hans-Joachim}, year={2014}, pages={1009–1020} }'
  chicago: Schiller, Sascha, and Hans-Joachim Schmid. “Ultrafine Dust Filtration Using
    Precoat Materials Considering the Influence of Filter Media.” <i>Chemical Engineering
    &#38; Technology</i>, 2014, 1009–20. <a href="https://doi.org/10.1002/ceat.201300856">https://doi.org/10.1002/ceat.201300856</a>.
  ieee: 'S. Schiller and H.-J. Schmid, “Ultrafine Dust Filtration Using Precoat Materials
    Considering the Influence of Filter Media,” <i>Chemical Engineering &#38; Technology</i>,
    pp. 1009–1020, 2014, doi: <a href="https://doi.org/10.1002/ceat.201300856">10.1002/ceat.201300856</a>.'
  mla: Schiller, Sascha, and Hans-Joachim Schmid. “Ultrafine Dust Filtration Using
    Precoat Materials Considering the Influence of Filter Media.” <i>Chemical Engineering
    &#38; Technology</i>, 2014, pp. 1009–20, doi:<a href="https://doi.org/10.1002/ceat.201300856">10.1002/ceat.201300856</a>.
  short: S. Schiller, H.-J. Schmid, Chemical Engineering &#38; Technology (2014) 1009–1020.
date_created: 2021-10-13T14:07:13Z
date_updated: 2022-01-06T06:57:16Z
doi: 10.1002/ceat.201300856
language:
- iso: eng
page: 1009-1020
publication: Chemical Engineering & Technology
publication_identifier:
  issn:
  - 0930-7516
publication_status: published
status: public
title: Ultrafine Dust Filtration Using Precoat Materials Considering the Influence
  of Filter Media
type: journal_article
user_id: '70093'
year: '2014'
...
---
_id: '26127'
abstract:
- lang: eng
  text: Capillary forces are very important as they exceed in general other adhesion
    forces. But at the same time the exact calculation of these forces is very complex,
    so often assumptions and approximations are used. Previous research was done with
    regard to micrometer sized particles, but the behavior of nanoscale particles
    is different. Hence, the results for micrometer sized particles cannot be directly
    transferred when considering nanoscale particles. Therefore, a simulation method
    was developed to calculate numerically the shape of a rotationally symmetrical
    capillary bridge between two spherical particles or a particle and a plate. The
    capillary bridge in the gap between the particles is formed due to capillary condensation
    and is in thermodynamic equilibrium with the gas phase. Hence the Kelvin equation
    and the Young–Laplace equation can be used to calculate the profile of the capillary
    bridge, depending on the relative humidity of the surrounding air. The bridge
    profile consists of several elements that are determined consecutively and interpolated
    linearly. After the shape is determined, the volume and force, divided into capillary
    pressure force and surface tension force, can be calculated. The validation of
    this numerical model will be shown by comparison with several different analytical
    calculations for micrometer-sized particles. Furthermore, it is demonstrated that
    two often used approximations, (1) the toroidal approximation and (2) the use
    of an effective radius, cannot be used for nanoscale particles without remarkable
    mistake. It will be discussed how the capillary force and its components depend
    on different parameters, like particle size, relative humidity, contact angle,
    and distance, respectively. The rupture of a capillary bridge due to particle
    separation will also be presented.
author:
- first_name: Michael
  full_name: Dörmann, Michael
  last_name: Dörmann
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
citation:
  ama: Dörmann M, Schmid H-J. Simulation of Capillary Bridges between Nanoscale Particles.
    <i>Langmuir</i>. Published online 2014:1055-1062. doi:<a href="https://doi.org/10.1021/la404409k">10.1021/la404409k</a>
  apa: Dörmann, M., &#38; Schmid, H.-J. (2014). Simulation of Capillary Bridges between
    Nanoscale Particles. <i>Langmuir</i>, 1055–1062. <a href="https://doi.org/10.1021/la404409k">https://doi.org/10.1021/la404409k</a>
  bibtex: '@article{Dörmann_Schmid_2014, title={Simulation of Capillary Bridges between
    Nanoscale Particles}, DOI={<a href="https://doi.org/10.1021/la404409k">10.1021/la404409k</a>},
    journal={Langmuir}, author={Dörmann, Michael and Schmid, Hans-Joachim}, year={2014},
    pages={1055–1062} }'
  chicago: Dörmann, Michael, and Hans-Joachim Schmid. “Simulation of Capillary Bridges
    between Nanoscale Particles.” <i>Langmuir</i>, 2014, 1055–62. <a href="https://doi.org/10.1021/la404409k">https://doi.org/10.1021/la404409k</a>.
  ieee: 'M. Dörmann and H.-J. Schmid, “Simulation of Capillary Bridges between Nanoscale
    Particles,” <i>Langmuir</i>, pp. 1055–1062, 2014, doi: <a href="https://doi.org/10.1021/la404409k">10.1021/la404409k</a>.'
  mla: Dörmann, Michael, and Hans-Joachim Schmid. “Simulation of Capillary Bridges
    between Nanoscale Particles.” <i>Langmuir</i>, 2014, pp. 1055–62, doi:<a href="https://doi.org/10.1021/la404409k">10.1021/la404409k</a>.
  short: M. Dörmann, H.-J. Schmid, Langmuir (2014) 1055–1062.
date_created: 2021-10-13T14:09:40Z
date_updated: 2022-01-06T06:57:16Z
doi: 10.1021/la404409k
language:
- iso: eng
page: 1055-1062
publication: Langmuir
publication_identifier:
  issn:
  - 0743-7463
  - 1520-5827
publication_status: published
status: public
title: Simulation of Capillary Bridges between Nanoscale Particles
type: journal_article
user_id: '70093'
year: '2014'
...
---
_id: '22176'
abstract:
- lang: eng
  text: One barrier of laser sintering (LS) to become the main process for Direct
    Manufacturing (DM) is the surface quality of LS parts. Hence, the property which
    has to be improved is the rough surfaces of LS parts due to the layered structure.
    Another additional effect is the incomplete melting of powder particles on the
    surface due to the high process temperature. In this paper we demonstrate our
    approach of a theoretical model for the topography of LS part surfaces. We investigated
    the surface roughness as a function of surface orientation. Considering that the
    model involves further variables as layer thickness, particle density and particle
    size distribution to describe the topography precisely. Experimental results were
    used to optimize and check the results of the model.
author:
- first_name: Patrick
  full_name: Delfs, Patrick
  last_name: Delfs
- first_name: A.A.
  full_name: Herale, A.A.
  last_name: Herale
- first_name: Z.
  full_name: Li, Z.
  last_name: Li
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
citation:
  ama: 'Delfs P, Herale AA, Li Z, Schmid H-J. Simulation of the Surface Topography
    on Laser Sintered Polymer Parts. In: <i>25th Annual International Solid Freeform
    Fabrication Symposium</i>. Vol 25. ; 2014:1250-1258. doi:<a href="http://utw10945.utweb.utexas.edu/sites/default/files/2014-098-Delfs.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2014-098-Delfs.pdf</a>'
  apa: Delfs, P., Herale, A. A., Li, Z., &#38; Schmid, H.-J. (2014). Simulation of
    the Surface Topography on Laser Sintered Polymer Parts. In <i>25th Annual International
    Solid Freeform Fabrication Symposium</i> (Vol. 25, pp. 1250–1258). <a href="http://utw10945.utweb.utexas.edu/sites/default/files/2014-098-Delfs.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2014-098-Delfs.pdf</a>
  bibtex: '@inproceedings{Delfs_Herale_Li_Schmid_2014, title={Simulation of the Surface
    Topography on Laser Sintered Polymer Parts}, volume={25}, DOI={<a href="http://utw10945.utweb.utexas.edu/sites/default/files/2014-098-Delfs.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2014-098-Delfs.pdf</a>},
    booktitle={25th Annual International Solid Freeform Fabrication Symposium}, author={Delfs,
    Patrick and Herale, A.A. and Li, Z. and Schmid, Hans-Joachim}, year={2014}, pages={1250–1258}
    }'
  chicago: Delfs, Patrick, A.A. Herale, Z. Li, and Hans-Joachim Schmid. “Simulation
    of the Surface Topography on Laser Sintered Polymer Parts.” In <i>25th Annual
    International Solid Freeform Fabrication Symposium</i>, 25:1250–58, 2014. <a href="http://utw10945.utweb.utexas.edu/sites/default/files/2014-098-Delfs.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2014-098-Delfs.pdf</a>.
  ieee: P. Delfs, A. A. Herale, Z. Li, and H.-J. Schmid, “Simulation of the Surface
    Topography on Laser Sintered Polymer Parts,” in <i>25th Annual International Solid
    Freeform Fabrication Symposium</i>, 2014, vol. 25, pp. 1250–1258.
  mla: Delfs, Patrick, et al. “Simulation of the Surface Topography on Laser Sintered
    Polymer Parts.” <i>25th Annual International Solid Freeform Fabrication Symposium</i>,
    vol. 25, 2014, pp. 1250–58, doi:<a href="http://utw10945.utweb.utexas.edu/sites/default/files/2014-098-Delfs.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2014-098-Delfs.pdf</a>.
  short: 'P. Delfs, A.A. Herale, Z. Li, H.-J. Schmid, in: 25th Annual International
    Solid Freeform Fabrication Symposium, 2014, pp. 1250–1258.'
date_created: 2021-05-14T07:46:05Z
date_updated: 2022-01-06T06:55:28Z
department:
- _id: '150'
- _id: '624'
- _id: '219'
doi: http://utw10945.utweb.utexas.edu/sites/default/files/2014-098-Delfs.pdf
intvolume: '        25'
language:
- iso: eng
page: 1250-1258
publication: 25th Annual International Solid Freeform Fabrication Symposium
status: public
title: Simulation of the Surface Topography on Laser Sintered Polymer Parts
type: conference
user_id: '71545'
volume: 25
year: '2014'
...
---
_id: '22177'
abstract:
- lang: eng
  text: An uneven temperature distribution and varying cooling rates at different
    positions within the part cake are two of the most important challenges regarding
    the part quality and reproducibility of the polymer laser sintering process. In
    the presented work, a temperature measurement system is implemented within an
    EOSINT P395 laser sintering system. It allows the determination of a three dimensional
    temperature distribution and history during the full build and cooling process.
    The influence of important job parameters, for example the packing density, job
    height and layer thickness, can be figured out. In combination with a finite element
    simulation of the cooling process, the temperature measurement will be the basis
    for optimized process controls.
author:
- first_name: Stefan
  full_name: Josupeit, Stefan
  last_name: Josupeit
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
citation:
  ama: 'Josupeit S, Schmid H-J. Three-dimensional in-process temperature measurement
    of laser sintered part cakes. In: <i>25th Annual International Solid Freeform
    Fabrication Symposium</i>. Vol 25. ; 2014:49-58. doi:<a href="http://utw10945.utweb.utexas.edu/sites/default/files/2014-006-Josupeit.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2014-006-Josupeit.pdf</a>'
  apa: Josupeit, S., &#38; Schmid, H.-J. (2014). Three-dimensional in-process temperature
    measurement of laser sintered part cakes. In <i>25th Annual International Solid
    Freeform Fabrication Symposium</i> (Vol. 25, pp. 49–58). <a href="http://utw10945.utweb.utexas.edu/sites/default/files/2014-006-Josupeit.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2014-006-Josupeit.pdf</a>
  bibtex: '@inproceedings{Josupeit_Schmid_2014, title={Three-dimensional in-process
    temperature measurement of laser sintered part cakes}, volume={25}, DOI={<a href="http://utw10945.utweb.utexas.edu/sites/default/files/2014-006-Josupeit.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2014-006-Josupeit.pdf</a>},
    booktitle={25th Annual International Solid Freeform Fabrication Symposium}, author={Josupeit,
    Stefan and Schmid, Hans-Joachim}, year={2014}, pages={49–58} }'
  chicago: Josupeit, Stefan, and Hans-Joachim Schmid. “Three-Dimensional in-Process
    Temperature Measurement of Laser Sintered Part Cakes.” In <i>25th Annual International
    Solid Freeform Fabrication Symposium</i>, 25:49–58, 2014. <a href="http://utw10945.utweb.utexas.edu/sites/default/files/2014-006-Josupeit.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2014-006-Josupeit.pdf</a>.
  ieee: S. Josupeit and H.-J. Schmid, “Three-dimensional in-process temperature measurement
    of laser sintered part cakes,” in <i>25th Annual International Solid Freeform
    Fabrication Symposium</i>, 2014, vol. 25, pp. 49–58.
  mla: Josupeit, Stefan, and Hans-Joachim Schmid. “Three-Dimensional in-Process Temperature
    Measurement of Laser Sintered Part Cakes.” <i>25th Annual International Solid
    Freeform Fabrication Symposium</i>, vol. 25, 2014, pp. 49–58, doi:<a href="http://utw10945.utweb.utexas.edu/sites/default/files/2014-006-Josupeit.pdf">http://utw10945.utweb.utexas.edu/sites/default/files/2014-006-Josupeit.pdf</a>.
  short: 'S. Josupeit, H.-J. Schmid, in: 25th Annual International Solid Freeform
    Fabrication Symposium, 2014, pp. 49–58.'
date_created: 2021-05-14T07:46:06Z
date_updated: 2022-01-06T06:55:28Z
department:
- _id: '150'
- _id: '624'
- _id: '219'
doi: http://utw10945.utweb.utexas.edu/sites/default/files/2014-006-Josupeit.pdf
intvolume: '        25'
language:
- iso: eng
page: 49-58
publication: 25th Annual International Solid Freeform Fabrication Symposium
status: public
title: Three-dimensional in-process temperature measurement of laser sintered part
  cakes
type: conference
user_id: '71545'
volume: 25
year: '2014'
...
---
_id: '22184'
abstract:
- lang: eng
  text: Polymer laser sintering is one of the most important additive manufacturing
    technologies for the tool-less production of three-dimensional prototypes and
    end-use parts. In this process, parts are manufactured layerwise out of a polymer
    powder by laser exposure. After the building process, these parts are located
    within a loose bulk powder cake. Due to long process times and high process temperatures,
    this powder ages thermally, which reduces the recyclability of the material. As
    a result, mixtures of used and virgin powder ("refreshed" powder) with a mixture
    ratio of approximately 50% are commonly used in the industry. The goal of this
    work is to determine the exact influence of different powder ages on resulting
    part quality characteristics, especially the mechanical behavior and the surface
    quality. Therefore, refreshed powder with different qualities adjusted by the
    melt volume rate (MVR) was processed along a defined process quality chain. To
    analyze the part qualities, mechanical tensile and profilometer tests were performed.
    The focus is on an application-oriented test set-up to ensure the usability of
    the results in the industry. The material used is polyamide 12 (PA 2200) processed
    on an EOSINT P395 laser sintering system from EOS GmbH, Krailling, Germany.
author:
- first_name: Stefan
  full_name: Josupeit, Stefan
  last_name: Josupeit
- first_name: Stefan
  full_name: Rüsenberg, Stefan
  last_name: Rüsenberg
- first_name: N.
  full_name: Rupp, N.
  last_name: Rupp
- first_name: Monika
  full_name: Gessler, Monika
  last_name: Gessler
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
citation:
  ama: 'Josupeit S, Rüsenberg S, Rupp N, Gessler M, Schmid H-J. Thermal ageing of
    polyamide 12 used for polymer laser sintering - influence on part quality characteristics.
    In: <i>72nd Annual Technical Conference of the Society of Plastics Engineers (ANTEC
    2014)</i>. Vol 72. ; 2014:2383-2385. doi:<a href="https://www.researchgate.net/publication/283135483_Thermal_ageing_of_polyamide_12_used_for_polymer_laser_sintering_-_Influence_on_part_quality_characteristics">https://www.researchgate.net/publication/283135483_Thermal_ageing_of_polyamide_12_used_for_polymer_laser_sintering_-_Influence_on_part_quality_characteristics</a>'
  apa: Josupeit, S., Rüsenberg, S., Rupp, N., Gessler, M., &#38; Schmid, H.-J. (2014).
    Thermal ageing of polyamide 12 used for polymer laser sintering - influence on
    part quality characteristics. In <i>72nd Annual Technical Conference of the Society
    of Plastics Engineers (ANTEC 2014)</i> (Vol. 72, pp. 2383–2385). <a href="https://www.researchgate.net/publication/283135483_Thermal_ageing_of_polyamide_12_used_for_polymer_laser_sintering_-_Influence_on_part_quality_characteristics">https://www.researchgate.net/publication/283135483_Thermal_ageing_of_polyamide_12_used_for_polymer_laser_sintering_-_Influence_on_part_quality_characteristics</a>
  bibtex: '@inproceedings{Josupeit_Rüsenberg_Rupp_Gessler_Schmid_2014, title={Thermal
    ageing of polyamide 12 used for polymer laser sintering - influence on part quality
    characteristics}, volume={72}, DOI={<a href="https://www.researchgate.net/publication/283135483_Thermal_ageing_of_polyamide_12_used_for_polymer_laser_sintering_-_Influence_on_part_quality_characteristics">https://www.researchgate.net/publication/283135483_Thermal_ageing_of_polyamide_12_used_for_polymer_laser_sintering_-_Influence_on_part_quality_characteristics</a>},
    number={3}, booktitle={72nd Annual Technical Conference of the Society of Plastics
    Engineers (ANTEC 2014)}, author={Josupeit, Stefan and Rüsenberg, Stefan and Rupp,
    N. and Gessler, Monika and Schmid, Hans-Joachim}, year={2014}, pages={2383–2385}
    }'
  chicago: Josupeit, Stefan, Stefan Rüsenberg, N. Rupp, Monika Gessler, and Hans-Joachim
    Schmid. “Thermal Ageing of Polyamide 12 Used for Polymer Laser Sintering - Influence
    on Part Quality Characteristics.” In <i>72nd Annual Technical Conference of the
    Society of Plastics Engineers (ANTEC 2014)</i>, 72:2383–85, 2014. <a href="https://www.researchgate.net/publication/283135483_Thermal_ageing_of_polyamide_12_used_for_polymer_laser_sintering_-_Influence_on_part_quality_characteristics">https://www.researchgate.net/publication/283135483_Thermal_ageing_of_polyamide_12_used_for_polymer_laser_sintering_-_Influence_on_part_quality_characteristics</a>.
  ieee: S. Josupeit, S. Rüsenberg, N. Rupp, M. Gessler, and H.-J. Schmid, “Thermal
    ageing of polyamide 12 used for polymer laser sintering - influence on part quality
    characteristics,” in <i>72nd Annual Technical Conference of the Society of Plastics
    Engineers (ANTEC 2014)</i>, 2014, vol. 72, no. 3, pp. 2383–2385.
  mla: Josupeit, Stefan, et al. “Thermal Ageing of Polyamide 12 Used for Polymer Laser
    Sintering - Influence on Part Quality Characteristics.” <i>72nd Annual Technical
    Conference of the Society of Plastics Engineers (ANTEC 2014)</i>, vol. 72, no.
    3, 2014, pp. 2383–85, doi:<a href="https://www.researchgate.net/publication/283135483_Thermal_ageing_of_polyamide_12_used_for_polymer_laser_sintering_-_Influence_on_part_quality_characteristics">https://www.researchgate.net/publication/283135483_Thermal_ageing_of_polyamide_12_used_for_polymer_laser_sintering_-_Influence_on_part_quality_characteristics</a>.
  short: 'S. Josupeit, S. Rüsenberg, N. Rupp, M. Gessler, H.-J. Schmid, in: 72nd Annual
    Technical Conference of the Society of Plastics Engineers (ANTEC 2014), 2014,
    pp. 2383–2385.'
date_created: 2021-05-14T07:46:14Z
date_updated: 2022-01-06T06:55:28Z
department:
- _id: '150'
- _id: '624'
- _id: '219'
doi: https://www.researchgate.net/publication/283135483_Thermal_ageing_of_polyamide_12_used_for_polymer_laser_sintering_-_Influence_on_part_quality_characteristics
intvolume: '        72'
issue: '3'
language:
- iso: eng
page: 2383-2385
publication: 72nd Annual Technical Conference of the Society of Plastics Engineers
  (ANTEC 2014)
publication_identifier:
  isbn:
  - 978-1-634-39708-7
status: public
title: Thermal ageing of polyamide 12 used for polymer laser sintering - influence
  on part quality characteristics
type: conference
user_id: '71545'
volume: 72
year: '2014'
...