PRACTICAL KINETIC-MODEL FOR HARD-SPHERE DYNAMICS

The revised Enskog theory for a classical system of hard spheres provi des a unified description of both fluid and crystal states over a wide range of densities and wavelengths. However, practical applications o f this theory have been limited to fluid states near equilibrium. We p ropose here a simpler kinetic model that retains its essential physica l and mathematical features, but which admits practical application to complex dynamical phenomena. This is illustrated by a calculation of the rheological properties of the fluid phase under shear flow. Good a greement is obtained in comparison with corresponding Monte Carlo simu lation results.