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

Naser Hamedi, Johan Revstedt, Eva Tornberg, Fredrik Innings

Research output: Contribution to journalArticlepeer-review

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 < 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.
Original languageEnglish
Article number35341
JournalApplied Rheology
Volume26
Issue number3
DOIs
Publication statusPublished - 2016

Subject classification (UKÄ)

  • Energy Engineering

Free keywords

  • CFD
  • Correction
  • Couette Rheometer
  • Fluid properties
  • Inverse problem
  • Power-law fluid

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