Multicomponent diffusion in gases and plasma mixtures
Molecular diffusion fluxes derived from kinetic theory are investigated. New expressions for molecular flux given by Stefan – Maxwell relationships derived for any level of Sonine’s polynomial expansion are presented with corresponding coefficients, and analysed. The accuracy of the coefficients is investigated. New simplified expressions for multicomponent diffusion coefficients are introduced, and compared with the predictions of kinetic theory for high orders of Sonine’s polynomial expansions.