---
_id: '36983'
abstract:
- lang: eng
  text: "<jats:title>Abstract</jats:title><jats:p>The use of structured measuring
    systems to prevent wall slip is a common approach to obtain absolute rheological
    values. Typically, only the minimum distance between the measuring surfaces is
    used for further calculation, implying that no flow occurs between the structural
    elements. But this assumption is misleading, and a gap correction is necessary.
    To determine the radius correction <jats:inline-formula><jats:alternatives><jats:tex-math>$$\\Delta
    r$$</jats:tex-math><mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\">\r\n
    \               <mml:mrow>\r\n                  <mml:mi>Δ</mml:mi>\r\n                  <mml:mi>r</mml:mi>\r\n
    \               </mml:mrow>\r\n              </mml:math></jats:alternatives></jats:inline-formula>
    for specific geometries, we conducted investigations on three Newtonian fluids
    (two silicon oils and one suspension considered to be Newtonian in the relevant
    shear rate range). The results show that <jats:inline-formula><jats:alternatives><jats:tex-math>$$\\Delta
    r$$</jats:tex-math><mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\">\r\n
    \               <mml:mrow>\r\n                  <mml:mi>Δ</mml:mi>\r\n                  <mml:mi>r</mml:mi>\r\n
    \               </mml:mrow>\r\n              </mml:math></jats:alternatives></jats:inline-formula>
    is not only shear- and material-independent, but geometry-dependent, providing
    a Newtonian flow behaviour in a similar viscosity range. Therefore, a correction
    value can be determined with only minute deviations in different Newtonian fluids.
    As the conducted laboratory measurements are very time-consuming and expensive,
    a CFD-approach with only very small deviations was additionally developed and
    compared for validation purposes. Therefore, simulation is an effective and resource-efficient
    alternative to the presented laboratory measurements to determine <jats:inline-formula><jats:alternatives><jats:tex-math>$$\\Delta
    r$$</jats:tex-math><mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\">\r\n
    \               <mml:mrow>\r\n                  <mml:mi>Δ</mml:mi>\r\n                  <mml:mi>r</mml:mi>\r\n
    \               </mml:mrow>\r\n              </mml:math></jats:alternatives></jats:inline-formula>
    for the correction of structured coaxial geometries even for non-Newtonian fluids
    in the future.</jats:p>"
article_type: original
author:
- first_name: Sebastian
  full_name: Josch, Sebastian
  id: '38243'
  last_name: Josch
- first_name: Steffen
  full_name: Jesinghausen, Steffen
  id: '3959'
  last_name: Jesinghausen
  orcid: https://orcid.org/0000-0003-2611-5298
- first_name: Christopher
  full_name: Dechert, Christopher
  id: '69828'
  last_name: Dechert
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
  orcid: 000-0001-8590-1921
citation:
  ama: Josch S, Jesinghausen S, Dechert C, Schmid H-J. Experimental and simulative
    determination and correction of the effective gap extension in structured coaxial
    measuring systems. <i>Rheologica Acta</i>. Published online 2023. doi:<a href="https://doi.org/10.1007/s00397-023-01383-2">10.1007/s00397-023-01383-2</a>
  apa: Josch, S., Jesinghausen, S., Dechert, C., &#38; Schmid, H.-J. (2023). Experimental
    and simulative determination and correction of the effective gap extension in
    structured coaxial measuring systems. <i>Rheologica Acta</i>. <a href="https://doi.org/10.1007/s00397-023-01383-2">https://doi.org/10.1007/s00397-023-01383-2</a>
  bibtex: '@article{Josch_Jesinghausen_Dechert_Schmid_2023, title={Experimental and
    simulative determination and correction of the effective gap extension in structured
    coaxial measuring systems}, DOI={<a href="https://doi.org/10.1007/s00397-023-01383-2">10.1007/s00397-023-01383-2</a>},
    journal={Rheologica Acta}, publisher={Springer Science and Business Media LLC},
    author={Josch, Sebastian and Jesinghausen, Steffen and Dechert, Christopher and
    Schmid, Hans-Joachim}, year={2023} }'
  chicago: Josch, Sebastian, Steffen Jesinghausen, Christopher Dechert, and Hans-Joachim
    Schmid. “Experimental and Simulative Determination and Correction of the Effective
    Gap Extension in Structured Coaxial Measuring Systems.” <i>Rheologica Acta</i>,
    2023. <a href="https://doi.org/10.1007/s00397-023-01383-2">https://doi.org/10.1007/s00397-023-01383-2</a>.
  ieee: 'S. Josch, S. Jesinghausen, C. Dechert, and H.-J. Schmid, “Experimental and
    simulative determination and correction of the effective gap extension in structured
    coaxial measuring systems,” <i>Rheologica Acta</i>, 2023, doi: <a href="https://doi.org/10.1007/s00397-023-01383-2">10.1007/s00397-023-01383-2</a>.'
  mla: Josch, Sebastian, et al. “Experimental and Simulative Determination and Correction
    of the Effective Gap Extension in Structured Coaxial Measuring Systems.” <i>Rheologica
    Acta</i>, Springer Science and Business Media LLC, 2023, doi:<a href="https://doi.org/10.1007/s00397-023-01383-2">10.1007/s00397-023-01383-2</a>.
  short: S. Josch, S. Jesinghausen, C. Dechert, H.-J. Schmid, Rheologica Acta (2023).
date_created: 2023-01-17T08:04:24Z
date_updated: 2023-03-14T07:41:28Z
department:
- _id: '150'
doi: 10.1007/s00397-023-01383-2
keyword:
- rheology
- rheometry
- suspension
- coaxial
- correction
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://link.springer.com/article/10.1007/s00397-023-01383-2
oa: '1'
publication: Rheologica Acta
publication_identifier:
  issn:
  - 0035-4511
  - 1435-1528
publication_status: published
publisher: Springer Science and Business Media LLC
quality_controlled: '1'
status: public
title: Experimental and simulative determination and correction of the effective gap
  extension in structured coaxial measuring systems
type: journal_article
user_id: '3959'
year: '2023'
...