SHEAR-INDUCED PARTICLE DIFFUSION IN INELASTIC HARD-SPHERE FLUIDS

A large-scale numerical simulation of a system of inelastic, rough, ha rd spheres of volume fraction phi(S) = 0.565, starting from a disorder ed configuration in a Couette geometry, shows a transition to a layere d state, which possesses long-range orientation order, after long run times. This phase transition is shown to cause a dramatic decay of the long-time transverse self-diffusion coefficient of particles. As the solid volume fraction is increased to 0.58, the dimensionless transver se self-diffusion coefficient decays further, approaching a value of o rder 10(-5), which indicates structural arrest. [S1063-651X(98)50811-2 ].