Abstract
The effect of particle–particle contact on the stress of a suspension of small spheres in plane strain flow is investigated. We provide an analytic form for the particle pair distribution function in the case of no Brownian motion, and calculate the viscosity and normal stress difference based on this. We show that the viscosity is reduced by contact, and a normal stress difference induced, both at order boundary layer and demonstrating that diffusion reduces the magnitude of the contact effect but does not qualitatively alter it.
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