Virial expansions and augmented van der Waals approach: Application to Lennard-Jones-like Yukawa fluid

Abstract

We argue that recently proposed [Melnyk et al., Fluid Phase Equilibr., 2009, 279, 1] a criterion to split the pair interaction potential into two parts, one of which is forced to be responsible for excluded volume in the system, results in the expressions for virial coefficients that improve the performance of the virial equation of state in general, and at subcritical temperatures, in particular. As an example, application to the Lennard-Jones-like hard-core attractive Yukawa fluid is discussed.

Keywords

• excluded volume
• hard-core attractive Yukawa fluid
• virial equation of state
• second virial coefficient
• van der Waals equation