The Effects of Concentration in Fluid Suspensions

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Abstract
Expressions for the relative viscosity of fluid suspensions are obtained using a continuum model. A substructure spin boundary condition intermediate between zero spin and zero antisymmetric stress is formulated by introducing a wall condition parameter. Simple shearing motion is examined and a simple relation between the boundary condition parameter and the suspension concentration is postulated. The resulting expression for relative viscosity is found to agree closely with the experimental results of V and for concentrations below 0.3.

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