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Article Dans Une Revue Soft Matter Année : 2018

Shear thinning in non-Brownian suspensions

Résumé

We study the flow of suspensions of non-Brownian particles dispersed into a Newtonian solvent. Combining capillary rheometry and conventional rheometry, we evidence a succession of two shear thinning regimes separated by a shear thickening one. Through X-ray radiography measurements, we show that during each of those regimes, the flow remains homogeneous and does not involve particle migration. Using a quartz-tuning fork based atomic force microscope, we measure the repulsive force profile and the microscopic friction coefficient m between two particles immersed into the solvent, as a function of normal load. Coupling measurements from those three techniques, we propose that (1) the first shear-thinning regime at low shear rates occurs for a lubricated rheology and can be interpreted as a decrease of the effective volume fraction under increasing particle pressures, due to short-ranged repulsive forces and (2) the second shear thinning regime after the shear-thickening transition occurs for a frictional rheology and can be interpreted as stemming from a decrease of the microscopic friction coefficient at large normal load.
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Dates et versions

hal-01706633 , version 1 (12-02-2018)

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Guillaume Chatté, Jean Comtet, Antoine Niguès, Lydéric Bocquet, Alessandro Siria, et al.. Shear thinning in non-Brownian suspensions. Soft Matter, 2018, 14 (6), pp.879 - 893. ⟨10.1039/c7sm01963g⟩. ⟨hal-01706633⟩
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