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The effect of steepness of soft-core square-well potential model on some fluid properties
, Article Molecular Physics ; Volume 106, Issue 1 , 2008 , Pages 103-112 ; 00268976 (ISSN) ; Parsafar, G. A ; Sharif University of Technology
2008
Abstract
The effect of repulsive steepness of the soft-core square well (SCSW) potential model on the second virial coefficient, critical behaviour (two- phase region and the position of critical point), and coordination number are investigated. The soft-core thermodynamic perturbation theory (TPT) presented by Weeks-Chandler-Anderson (WCA) recently developed by Ben-Amotz and Stell (BAS) has been used for the reference system, and the Barker-Henderson TPT for the perturbed system. The Barker-Henderson macroscopic compressibility approximation has been used for all order perturbation terms in which the second-order one is improved by assuming that the molecules in every two neighbouring shells are...