Application of Cfd-Based Correction Factors to Increase the Accuracy of Flow Curve Determination in A Couette Rheometer

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 pr...

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Main Authors: Hamedi Naser, Revstedt Johan, Tornberg Eva, Innings Fredrik
Format: Article
Language:English
Published: De Gruyter 2016-06-01
Series:Applied Rheology
Subjects:
Online Access:https://doi.org/10.3933/applrheol-26-35341
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author Hamedi Naser
Revstedt Johan
Tornberg Eva
Innings Fredrik
author_facet Hamedi Naser
Revstedt Johan
Tornberg Eva
Innings Fredrik
author_sort Hamedi Naser
collection DOAJ
description 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.
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spelling doaj.art-398a39c659a14458963b64581474539a2022-12-21T22:37:13ZengDe GruyterApplied Rheology1617-81062016-06-01263203110.3933/applrheol-26-35341Application of Cfd-Based Correction Factors to Increase the Accuracy of Flow Curve Determination in A Couette RheometerHamedi Naser0Revstedt Johan1Tornberg Eva2Innings Fredrik3Department of Energy Sciences, LTH, Lund University, P.O. Box 118, 221 00Lund, SwedenDepartment of Energy Sciences, LTH, Lund University, P.O. Box 118, 221 00Lund, SwedenDepartment of Food Technology, Engineering and Nutrition, LTH, Lund University, P.O. Box 124, 221 00Lund, SwedenTetra Pak Processing Systems, Ruben Rausings Gata, 221 86Lund, SwedenThe 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.https://doi.org/10.3933/applrheol-26-35341couette rheometercfdinverse problemfluid propertiescorrectionpower-law fluid
spellingShingle Hamedi Naser
Revstedt Johan
Tornberg Eva
Innings Fredrik
Application of Cfd-Based Correction Factors to Increase the Accuracy of Flow Curve Determination in A Couette Rheometer
Applied Rheology
couette rheometer
cfd
inverse problem
fluid properties
correction
power-law fluid
title Application of Cfd-Based Correction Factors to Increase the Accuracy of Flow Curve Determination in A Couette Rheometer
title_full Application of Cfd-Based Correction Factors to Increase the Accuracy of Flow Curve Determination in A Couette Rheometer
title_fullStr Application of Cfd-Based Correction Factors to Increase the Accuracy of Flow Curve Determination in A Couette Rheometer
title_full_unstemmed Application of Cfd-Based Correction Factors to Increase the Accuracy of Flow Curve Determination in A Couette Rheometer
title_short Application of Cfd-Based Correction Factors to Increase the Accuracy of Flow Curve Determination in A Couette Rheometer
title_sort application of cfd based correction factors to increase the accuracy of flow curve determination in a couette rheometer
topic couette rheometer
cfd
inverse problem
fluid properties
correction
power-law fluid
url https://doi.org/10.3933/applrheol-26-35341
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AT tornbergeva applicationofcfdbasedcorrectionfactorstoincreasetheaccuracyofflowcurvedeterminationinacouetterheometer
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