Mutual and self-diffusion in binary mixtures

Abstract

The relationship between the self and mutual diffusion coefficients in binary mixtures of dilute and dense hard sphere fluids is discussed on the basis of Bearman's equations for diffusion, with the hard sphere friction constants derived by taking into account the change in collision frequency on passing from the dilute to the dense fluid. The connection with the equations of Chapman-Enskog, Thorne, Douglass and Frisch is also considered together with the relationship to the viscosity of systems of mixed hard spheres.