Enskog and Enskog-Vlasov equations with a modified correlation factor and their H theorem.

Takata, Shigeru; Takahashi, Aoto · Phys Rev E · 2025

basic_science · Level V

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Abstract

A modification of the original Enskog equation, which is different from the so-called modified (or revised) Enskog equation, is proposed. The modification changes the correlation factor from a function of density to a functional of density in a simple form without series structure. The present modification is semiphenomenological but is generic to be adapted to a given equation of state for nonideal gases. It is shown that the H theorem can be established for the Enskog and the Enskog-Vlasov equation with the proposed modification.