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Shear thickening and migration in granular suspensions

By Abdoulaye Fall, Anael Lemaitre, François Bertrand, Daniel Bonn and Guillaume Ovarlez

Abstract

International audienceWe study the emergence of shear thickening in dense suspensions of non-Brownian particles. We combine local velocity and concentration measurements using Magnetic Resonance Imaging with macroscopic rheometry experiments. In steady state, we observe that the material is heterogeneous, and we find that that the local rheology presents a continuous transition at low shear rate from a viscous to a shear thickening, Bagnoldian, behavior with shear stresses proportional to the shear rate squared, as predicted by a scaling analysis. We show that the heterogeneity results from an unexpectedly fast migration of grains, which we attribute to the emergence of the Bagnoldian rheology. The migration process is observed to be accompanied by macroscopic transient discontinuous shear thickening, which is consequently not an intrinsic property of granular suspensions

Topics: Shear thickening, suspension, granular material, migration, [ PHYS.COND.CM-SCM ] Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Publisher: American Physical Society
Year: 2010
DOI identifier: 10.1103/PhysRevLett.105.268303
OAI identifier: oai:HAL:hal-00490742v2
Provided by: Hal-Diderot

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