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Article Dans Une Revue Journal of Non-Newtonian Fluid Mechanics Année : 2008

Processing the Couette viscometry data using a Bingham approximation in shear rate calculation

Résumé

This paper presents an approach to computing the shear flowcurve from torque-rotational velocity data in a Couette rheometer. The approximation techniques in shear rate calculation are generally dictated by the radius ratio between coaxial cylinders and the rheological behaviour of fluid tested. Here, the approach consists in analysing the sheared material as a Bingham fluid and computing an average shear rate when the fluid in the cylindrical gap is partially and fully sheared. We focus in particular on the applicability of the Bingham approximation in shear rate calculation. First, the approach is assessed by examining synthetic data generated with Newtonian, non-Newtonian and yield stress materials with known properties, varying the gap radius ratio. The results, which are compared with commonly used techniques in shear rate calculation, prove the relevance of the proposed approach. Finally, its efficiency is examined by applying it to process Couette data of yield stress fluids taken from published works.
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Dates et versions

hal-00664433 , version 1 (30-01-2012)

Identifiants

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Patrice Estellé, Christophe Lanos, Arnaud Perrot. Processing the Couette viscometry data using a Bingham approximation in shear rate calculation. Journal of Non-Newtonian Fluid Mechanics, 2008, 154, pp.31-38. ⟨10.1016/j.jnnfm.2008.01.006⟩. ⟨hal-00664433⟩
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