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Naser Hamedi, Johan Revstedt, Eva Tornberg, Fredrik Innings
Application of CFD–based Correction Factors to Increase the Accuracy of Flow Curve Determination in a Couette Rheometer
Appl. Rheol. 26:3 (2016) 35341 (12 pages)
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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.
► Cite this publication as follows:
Hamedi N, Revstedt J, Tornberg E, Innings F: Application of CFD–based Correction Factors to Increase the Accuracy of Flow Curve Determination in a Couette Rheometer, Appl. Rheol. 26 (2016) 35341.
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