Roles of solid effective stress and fluid-particle interaction force in modeling shear-induced particle migration in non-Brownian suspensions

The applicability of some constitutive equations for the solid stress tensor used in mixture model to describe shear-induced migration neutrally buoyant particles Newtonian fluids is investigated. It shown that moderately dense suspensions, where direct particle contacts and interparticle forces are negligible, must be due lubrication between particles. Results highlight accounting these part fluid phase, not phase and, particular, it coincides with particle-presence related forces.