Rheology and microstructure in colloidal suspensions (original) (raw)

Physica Scripta, 1993

Abstract

ABSTRACT The rheological behavior of a suspension of Brownian spheres at low Reynold numbers can be predicted with the help of Stokesian dynamics. In this approach the stress on each particle is calculated for a given configuration of the particles, then the configuration is changed according to the equations of motion based on Stokesian dynamics. The average stress follows from the time average over the configurations. The shear viscosity obtained by this method compares very well with the experimental results, both as function of the volume fraction and of the Peclet number. The origin of shear thinning and of shear thickening behaviors is respectively due to the saturation of the Brownian stress with the shear rate on one hand and to the formation of large aggregates on the other hand. At intermediate Peclet numbers a shear induced ordering is observed which is not directly linked to the behavior of the viscosity. Other kinds of transitions induced both in the presence of a shear flow and of an electric field will be presented.

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