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Jinjun Zhang, Liping Guo, Houxing Teng
Evaluation of thixotropic models for waxy crude oils based on shear stress decay at constant shear rates
Appl. Rheol. 20:5 (2010) 53944 (7 pages)
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Thixotropy is an important rheological behavior of waxy crude oils. The objective of this paper is to demonstrate existing
model's abilities to describe shear stress decay behaviors of waxy crude oils at constant shear rates. Seven models specially
developed for or currently used to waxy crude oils are reviewed as well as two viscoelastic-thixotropic models for human
blood. Stress decay behaviors were measured for four waxy crude oils and at various temperatures. Each of the models was
used to fit the stress decay plots at a single shear rate, and at multiple shear rates, respectively. Globally, Zhao's model, a complex
viscoplatic model with two structure parameters and twelve physical & fitting parameters,matched the experimental
plots better than other compared models. While the three models with viscoelastic backgrounds were not quite successful.
For use of models, one may make choice by comprehensively considering a model's complexity in mathematic form and abilities
to describe the rheological behaviors.
► Cite this publication as follows:
Zhang J, Guo L, Teng H: Evaluation of thixotropic models for waxy crude oils based on shear stress decay at constant shear rates, Appl. Rheol. 20 (2010) 53944.
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