Abstract
A continuum model of fluid suspensions is applied to the Poiseuille flow of a fluid in which suspension deformations are negligible. A substructure spin boundary condition intermediate between zero spin and zero antisymmetric stress is formulated by introducing a wall condition parameter. A simple relation is postulated between the wall condition parameter and the suspension concentration and an expression is obtained for the relative viscosity of the fluid suspension. The resulting expression is found to agree closely with the experimental results of
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