Author(s)

Z. Fang, M.S. Ingber & A.A. Mammoli

Abstract

A rheological model for the flow of concentrated suspensions based on the volume-aver aged velocity of suspended particles in a viscous fluid has been developed. The so-called diffusive-flux model is employed to investigate the demixing rate of neutrally-buoyant suspensions in a wide gap Couette device. The model employs two tuning parameters (diffusion coefficients) KC and K^ which govern the relative rates and magnitudes of particle diffusion caused by gradients in the particle interaction frequency and viscosity, respectively. These tuning parameters were originally sized based on no-slip boundary conditions. However, because the velocity is volume-averaged over the fluid and solid phas

Keywords