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Application of Cfd-Based Correction Factors to Increase the Accuracy of Flow Curve Determination in A Couette Rheometer
- Source :
- Applied Rheology, Vol 26, Iss 3, Pp 20-31 (2016)
- Publication Year :
- 2016
- Publisher :
- De Gruyter, 2016.
-
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.
Details
- Language :
- English
- ISSN :
- 16178106
- Volume :
- 26
- Issue :
- 3
- Database :
- Directory of Open Access Journals
- Journal :
- Applied Rheology
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.398a39c659a14458963b64581474539a
- Document Type :
- article
- Full Text :
- https://doi.org/10.3933/applrheol-26-35341