---
_id: '21948'
abstract:
- lang: eng
  text: <jats:p>Since suspensions (e.g., in food, cement, or cosmetics industries)
    tend to show wall slip, the application of structured measuring surfaces in rheometers
    is widespread. Usually, for parallel-plate geometries, the tip-to-tip distance
    is used for calculation of absolute rheological values, which implies that there
    is no flow behind this distance. However, several studies show that this is not
    true. Therefore, the measuring gap needs to be corrected by adding the effective
    gap extension    δ    to the prescribed gap height    H    in order to obtain
    absolute rheological properties. In this paper, we determine the effective gap
    extension    δ    for different structures and fluids (Newtonian, shear thinning,
    and model suspensions that can be adjusted to the behavior of real fluids) and
    compare the corrected values to reference data. We observe that for Newtonian
    fluids a gap- and material-independent correction function can be derived for
    every measuring system, which is also applicable to suspensions, but not to shear
    thinning fluids. Since this relation appears to be mainly dependent on the characteristics
    of flow behaviour, we show that the calibration of structured measuring systems
    is possible with Newtonian fluids and then can be transferred to suspensions up
    to a certain particle content.</jats:p>
article_number: '467'
article_type: original
author:
- first_name: Sebastian
  full_name: Pawelczyk, Sebastian
  id: '38243'
  last_name: Pawelczyk
- first_name: Marieluise
  full_name: Kniepkamp, Marieluise
  last_name: Kniepkamp
- first_name: Steffen
  full_name: Jesinghausen, Steffen
  id: '3959'
  last_name: Jesinghausen
  orcid: https://orcid.org/0000-0003-2611-5298
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
citation:
  ama: 'Pawelczyk S, Kniepkamp M, Jesinghausen S, Schmid H-J. Absolute Rheological
    Measurements of Model Suspensions: Influence and Correction of Wall Slip Prevention
    Measures. <i>Materials</i>. Published online 2020. doi:<a href="https://doi.org/10.3390/ma13020467">10.3390/ma13020467</a>'
  apa: 'Pawelczyk, S., Kniepkamp, M., Jesinghausen, S., &#38; Schmid, H.-J. (2020).
    Absolute Rheological Measurements of Model Suspensions: Influence and Correction
    of Wall Slip Prevention Measures. <i>Materials</i>, Article 467. <a href="https://doi.org/10.3390/ma13020467">https://doi.org/10.3390/ma13020467</a>'
  bibtex: '@article{Pawelczyk_Kniepkamp_Jesinghausen_Schmid_2020, title={Absolute
    Rheological Measurements of Model Suspensions: Influence and Correction of Wall
    Slip Prevention Measures}, DOI={<a href="https://doi.org/10.3390/ma13020467">10.3390/ma13020467</a>},
    number={467}, journal={Materials}, author={Pawelczyk, Sebastian and Kniepkamp,
    Marieluise and Jesinghausen, Steffen and Schmid, Hans-Joachim}, year={2020} }'
  chicago: 'Pawelczyk, Sebastian, Marieluise Kniepkamp, Steffen Jesinghausen, and
    Hans-Joachim Schmid. “Absolute Rheological Measurements of Model Suspensions:
    Influence and Correction of Wall Slip Prevention Measures.” <i>Materials</i>,
    2020. <a href="https://doi.org/10.3390/ma13020467">https://doi.org/10.3390/ma13020467</a>.'
  ieee: 'S. Pawelczyk, M. Kniepkamp, S. Jesinghausen, and H.-J. Schmid, “Absolute
    Rheological Measurements of Model Suspensions: Influence and Correction of Wall
    Slip Prevention Measures,” <i>Materials</i>, Art. no. 467, 2020, doi: <a href="https://doi.org/10.3390/ma13020467">10.3390/ma13020467</a>.'
  mla: 'Pawelczyk, Sebastian, et al. “Absolute Rheological Measurements of Model Suspensions:
    Influence and Correction of Wall Slip Prevention Measures.” <i>Materials</i>,
    467, 2020, doi:<a href="https://doi.org/10.3390/ma13020467">10.3390/ma13020467</a>.'
  short: S. Pawelczyk, M. Kniepkamp, S. Jesinghausen, H.-J. Schmid, Materials (2020).
date_created: 2021-05-04T08:48:48Z
date_updated: 2023-01-17T07:45:59Z
department:
- _id: '150'
doi: 10.3390/ma13020467
keyword:
- wall slip prevention
- effective gap height
- parallel-plate system
- structured surfaces
- model suspensions
- cement paste
- fresh concrete
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://www.mdpi.com/1996-1944/13/2/467
oa: '1'
publication: Materials
publication_identifier:
  issn:
  - 1996-1944
publication_status: published
quality_controlled: '1'
status: public
title: 'Absolute Rheological Measurements of Model Suspensions: Influence and Correction
  of Wall Slip Prevention Measures'
type: journal_article
user_id: '3959'
year: '2020'
...