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Correction of instrumentalinertia effects in controlled stress rheometry

Published online by Cambridge University Press:  15 May 1998

C. Baravian  and
D. Quemada
C. Baravian
Affiliation:
Laboratoire d'Énergétique et de Mécanique Théorique et Appliquée, Institut National Polytechnique de Lorraine (CNRS–UMR 7563), 2 avenue de la forêt de Haye, BP 160, 54504 Vandœuvre-lès-Nancy, France
D. Quemada
Affiliation:
Laboratoire de Biorhéologie et d'Hydrodynamique Physico-Chimique, Université Paris 7, Denis Diderot (CNRS–URA 343), 2 place Jussieu, 75005 Paris, France
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Abstract

An analysis of inertia effects in controlled stress rheometry is presented. For Newtonian fluids, this study takes exact account of both the instrumental inertia and the discontinuous stress change in this type of rheometer. In fact, supposedly smooth stress ramps are always approximated by a series of stress steps. The significance of this limitation, which is sometimes critical, is pointed out for the first time. The error induced by assuming that the stress ramps are smooth in Krieger's method for inertia correction [1], is quantitatively evaluated. An improved calculation for non-Newtonian, inelastic fluids is described.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 2 , Issue 2 , May 1998 , pp. 189 - 195
Copyright
© EDP Sciences, 1998

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