Abstract
To predict the concentration dependency of diffusion coefficients in binary liquid mixtures, a conflgurational relaxation model proposed by Gray was developed with reference to the recent investigation for the micro-kinetics of molecular motion. The physical supposition of this model is that the evolution in the pair configuration space obeys a relaxation equation and that the conflgurational relaxation takes place when the free vacancy is located at the neighborhood of the first shell molecule. An important relation between shear viscosity and self-diffusion coefficients was derived by eliminating the relaxation rate coefficient from the equations for them. From this model, the concentration dependencies of self- and mutual diffusion coefficients for nonassociating binary liquid mixtures are predictable.
