Dense colloidal suspensions under time-dependent shear

J. M. Brader, Th. Voigtmann, M. E. Cates, M. Fuchs

Research output: Contribution to journalArticlepeer-review

Abstract

We consider the nonlinear rheology of dense colloidal suspensions under a time-dependent simple shear flow. Starting from the Smoluchowski equation for interacting Brownian particles advected by shearing (ignoring fluctuations in fluid velocity), we develop a formalism which enables the calculation of timedependent, far-from-equilibrium averages. Taking shear stress as an example, we derive exactly a generalized Green-Kubo relation and an equation of motion for the transient density correlator, involving a three-time memory function. Mode coupling approximations give a closed constitutive equation yielding the time-dependent stress for arbitrary shear rate history. We solve this equation numerically for the special case of a hard sphere glass subject to step strain.

Original languageEnglish
Article number058301
Pages (from-to)-
Number of pages4
JournalPhysical Review Letters
Volume98
Issue number5
DOIs
Publication statusPublished - 2 Feb 2007

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