Rheology and Structure of Concentrated Suspensions of Hard Spheres. Shear Induced Particle Migration

P. Mills , P. Snabre

The apparent shear viscosity, in the non-Brownian limit, for a homogeneous suspension of monodispersed hard spheres in systems ranging from dilute to concentrated was previously established. From an estimation of the viscous dissipation. We use the inter-particle distance dependence of the shear viscosity for determining the components of a local stress tensor associated with the transient network of particles for the volume fraction above the percolation threshold. For this purpose, we develop a model based on lubrication forces between colliding particles for coupling the particle stress tensor to the stress tensor of the suspension considered as an effective medium. In the case of non-uniform flows with low shear rate regions, it is necessary to introduce a non-local stress tensor since the stress can be directly transmitted by the network of particles over a correlation length larger than the particle diameter. This approach shows ...

Domaines: Articles anciens

P. Mills, P. Snabre. Rheology and Structure of Concentrated Suspensions of Hard Spheres. Shear Induced Particle Migration. Journal de Physique II, 1995, 5 (10), pp.1597-1608. ⟨10.1051/jp2:1995201⟩. ⟨jpa-00248257⟩