DIFFUSION OF THERMAL AND IMPURITY EXCITATIONS IN SUPERFLUID MIXTURES OF HELIUM-ISOTOPES

The matrix of dissipative coefficients was calculated starting from th e system of kinetic equations. These coefficients determine the diffus ion flows in three-component gas without any restrictions on statistic s and dispersion laws of particles. All diffusion coefficients of supe rfluid He-3 - He-4 solutions were obtained from these general relation s. The diffusion flow of phonons and rotons is shown to define nonaddi tive part of thermal conductivity. The obtained relations for coeffici ent of spin diffusion strictly differs from the empirical formulae use d so far that include the coefficient of mass diffusion. The theoretic al results have been compared with experimental data.