BASE SYSTEM OF DIFFUSION-COEFFICIENTS IN MULTICOMPONENT MIXTURE OF RAREFIED-GASES

It is shown that the diffusion coefficient matrix in a multicomponent mixture of rarefied gases may be determined by an infinite number of m ethods, due to the linear dependence of diffusion thermodynamic forces . The diffusion matrices may be both symmetric and have a more complex symmetry. They are all expressed in terms of a base system of diffusi on coefficients, which is uniquely defined by solving the Boltzmann ki netic equation in the first approximation of the Enskog-Chapman method . In particular, this method may be used for determining the multicomp onent diffusion coefficients known from the literature [1, 2].