Abstract
It is shown that the problem of the finite propagation speed of disturbances of the impurity concentration in a multicomponent fluid may be related to the corresponding separation of energy into the internal and macroscopic. If the total kinetic energy of the mixture of components combined with the potential energy of external forces is taken as the macroscopic energy, then, within the framework of the linear local equilibrium thermodynamics of irreversible processes, the diffusion is described by equations of the hyperbolic type. Because of the relative shortness of the local relaxation time for fairly large-scale disturbances, the equations are simplified to the usual diffusion equations of the parabolic type.
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