Kinetic Derivation of the Hydrodynamic Equations for Capillary Fluids

Based on the generalized kinetic equation for the one-particle distribution function with a small source, the transition from the kinetic to the hydrodynamic description of many-particle systems is performed. The basic feature of this new technique to obtain the hydrodynamic limit is that the latter has been partially incorporated into the kinetic equation itself. The hydrodynamic equations for capillary fluids are derived from the characteristic function for the local moments of the distribution function. The Fick's law appears as a consequence of the transformation law for the hydrodynamic quantities under time inversion.