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Rhéologie des pâtes granulaires

Abstract : We study the rheology of a non-Brownian granular paste. The usual picture for granular pastes is that there is a transition from frictional to lubricated flows with increasing shear rate. We show that, in fact, there is a transition from a localized flow to a flow without localization. The pertinent parameter characterizing this transition is the Leighton number, the ratio of lubrication to frictional forces. This number defines a critical shear rate below which no steady flow without localization exists. Moreover, using both MRI investigation techniques and classical rheology studies, we define a viscosity for granular pastes. To do such, migration of particles towards weakly sheared regions must be taken into account. This migration leads to a particle concentration profile. The viscosity is given by the constitutive law, with three equations intervening: the flow curve equation, the Krieger-Dougherty equation, and the shear stress-first normal stress difference ratio. Finally, we study shear-thickening corn starch suspensions, which also present a transition from a localized to a non-localized regime around a critical shear-thickening threshold.
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Contributor : Nicolas Huang <>
Submitted on : Sunday, September 23, 2007 - 2:48:29 AM
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  • HAL Id : tel-00174291, version 1


Nicolas Huang. Rhéologie des pâtes granulaires. Analyse de données, Statistiques et Probabilités []. Université Pierre et Marie Curie - Paris VI, 2006. Français. ⟨tel-00174291⟩



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