A new concept for augmented van der Waals equations of state

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• 作者：Ivo Nezbeda ; Roman Melnyk ; Andrij Trokhymchuk
• 关键词：Perturbation theory ; Molecular-based equation of state ; Augmented van der Waals ; Yukawa fluid
• 刊名：The Journal of Supercritical Fluids
• 出版年：2010
• 出版时间：December 2010
• 年：2010
• 卷：55
• 期：2
• 页码：448-454
• 全文大小：295 K

文摘

A novel approach to perturbed equations of state for simple fluids is presented and its advantages over the traditional perturbed hard sphere equations are demonstrated by its application to several model fluids. The approach is based on a short range Yukawa reference which incorporates, in addition to repulsive interactions, also attractive interactions at short separations. The considered models of common interest are the Sutherland, Lennard-Jones, and EXP6 fluids. It is shown that using the proposed approach the reference system captures a good deal of properties of the studied fluids and that an accurate equation of state can be obtained using only the crude mean field (augmented van der Waals) approach.