Statistical derivation of equations of multifluid hydrodynamics

Hydrodynamic equations for a mixture of $n$ fluids differing from each other by their molecular masses, temperatures and flow velocities are derived by means of Zubarev's nonequilibrium distribution function method, in the linear approximation with respect to intercomponent interaction and macroscopic spatial inhomogeneity of the system. Intermolecular forces are supposed to be central and short-ranged. The special case of slight deviation from equilibrium, when $n=2$, is considered, the formulas of two types corresponding to the fluctuation-dissipation theorems, being obtained.