Shear viscosity of suspensions of aligned non-Brownian fibres |
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Authors: | Anne Mongruel Michel Cloitre |
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Institution: | (1) Laboratoire GEMICO, ENSIC 1, Rue Grandville, BP 451 F-54001Nancy, France e-mail: mongruel@ensic.u-nancy.fr, FR;(2) UMR CNRS Elf-Atochem Centre d'Applications de Levallois BP 108, Levallois-Perret, France, FR |
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Abstract: | We report on the steady-state shear viscosity of suspensions of fibres dispersed in Newtonian fluids, in a wide range of
volume fractions throughout the dilute and semi-dilute regimes. We show that the apparent shear-thinning behaviour, which
is sometimes observed in the semi-dilute regime at intermediate shear rates, is an experimental artefact due to the presence
of transient clusters of entangled fibres in the suspensions. At high shear rates, the fibres are aligned and the suspensions
exhibit Newtonian behaviour. In this regime, the viscosity is a function of volume fraction and fibre aspect ratio only. The
data can be rescaled onto a universal curve using a variable that accounts for the average contribution of the particles to
the bulk stress. All these results are discussed in relation to recent theories.
Received: 19 January 1999 Accepted: 17 June 1999 |
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Keywords: | Suspensions Non-Brownian fibres Orientation distribution Hydrodynamic interactions Shear thinning |
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