Improved first order mean spherical approximation for simple fluids

Details Improved first order mean spherical approximation for simple fluids Improved first order mean spherical approximation for simple fluids

2012-02-20

arxiv.org/abs/1202.4260v1

Condens. Matter Phys., 2011, vol. 14, No. 3, 33004: 1-8

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 3 figures

Scientific paper

10.5488/CMP.14.33004

A perturbation approach based on the first-order mean spherical approximation (FMSA) is proposed. It consists in adopting a hard-sphere plus short-range attractive Yukawa fluid as the novel reference system, over which the perturbative solution of the Ornstein-Zernike equation is performed. A choice of the optimal range of the reference attraction is discussed. The results are compared against conventional FMSA/HS theory and Monte-Carlo simulation data for compressibility factor and vapor-liquid phase diagrams of the medium-ranged Yukawa fluid. Proposed theory keeps the same level of simplicity and transparency, as the conventional FMSA/HS approach does, but shows to be more accurate.

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