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Application of CFD–Based Correction Factors to Increase the Accuracy of Flow Curve Determination in a Couette Rheometer

Hamedi, Naser LU ; Revstedt, Johan LU ; Tornberg, Eva LU and Innings, Fredrik LU (2016) In Applied Rheology 26(3).
Abstract
The measurement and the investigation of the errors in a Couette rheometer have been a topic of considerable interest in many rheometric studies. In the present study, a more accurate predictor-corrector method based on CFD and the analytical solution of the problem is described. Comparing to the previous CFD-based method, in addition to considering the effect of the end parts, the presented correction factors also take into account the effect of the wide gap into a single coefficient. The correction factors are computed for both Newtonian and non-Newtonian fluids in wide and narrow gap rheometry. Results showed that the shear rate distribution across the gap is highly non-linear in non-Newtonian wide gap rheometry. Moreover, for very... (More)
The measurement and the investigation of the errors in a Couette rheometer have been a topic of considerable interest in many rheometric studies. In the present study, a more accurate predictor-corrector method based on CFD and the analytical solution of the problem is described. Comparing to the previous CFD-based method, in addition to considering the effect of the end parts, the presented correction factors also take into account the effect of the wide gap into a single coefficient. The correction factors are computed for both Newtonian and non-Newtonian fluids in wide and narrow gap rheometry. Results showed that the shear rate distribution across the gap is highly non-linear in non-Newtonian wide gap rheometry. Moreover, for very shear thinning fluid i.e. n < 0.4 in narrow gap rheometry, there is a need to apply correction factor to the calculated fluid properties. Comparing the presented CFD approach and the current approach, the correction factor can be enhanced up to 16% depending on the fluid behavior and the gap distance. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
CFD, Correction, Couette Rheometer, Fluid properties, Inverse problem, Power-law fluid
in
Applied Rheology
volume
26
issue
3
publisher
Kerschensteiner Verlag
external identifiers
  • scopus:84975505836
ISSN
1430-6395
DOI
10.3933/ApplRheol-26-35341
language
English
LU publication?
yes
id
051aabd8-5a1e-4c6c-b3ff-d82f3b84f933
date added to LUP
2016-05-10 20:51:47
date last changed
2017-07-23 05:14:15
@article{051aabd8-5a1e-4c6c-b3ff-d82f3b84f933,
  abstract     = {The measurement and the investigation of the errors in a Couette rheometer have been a topic of considerable interest in many rheometric studies. In the present study, a more accurate predictor-corrector method based on CFD and the analytical solution of the problem is described. Comparing to the previous CFD-based method, in addition to considering the effect of the end parts, the presented correction factors also take into account the effect of the wide gap into a single coefficient. The correction factors are computed for both Newtonian and non-Newtonian fluids in wide and narrow gap rheometry. Results showed that the shear rate distribution across the gap is highly non-linear in non-Newtonian wide gap rheometry. Moreover, for very shear thinning fluid i.e. n &lt; 0.4 in narrow gap rheometry, there is a need to apply correction factor to the calculated fluid properties. Comparing the presented CFD approach and the current approach, the correction factor can be enhanced up to 16% depending on the fluid behavior and the gap distance.},
  articleno    = {35341},
  author       = {Hamedi, Naser and Revstedt, Johan and Tornberg, Eva and Innings, Fredrik},
  issn         = {1430-6395},
  keyword      = {CFD,Correction,Couette Rheometer,Fluid properties,Inverse problem,Power-law fluid},
  language     = {eng},
  number       = {3},
  publisher    = {Kerschensteiner Verlag},
  series       = {Applied Rheology},
  title        = {Application of CFD–Based Correction Factors to Increase the Accuracy of Flow Curve Determination in a Couette Rheometer},
  url          = {http://dx.doi.org/10.3933/ApplRheol-26-35341},
  volume       = {26},
  year         = {2016},
}