文献类型：期刊文献

英文题名：Critical asymmetry in renormalization group theory for fluids

作者：Zhao, Wei[1];Wu, Liang[1];Wang, Long[1];Li, Liyan[1];Cai, Jun[1]

机构：[1]E China Univ Sci & Technol, Dept Chem, Shanghai 200237, Peoples R China

年份：2013

卷号：138

期号：23

外文期刊名：JOURNAL OF CHEMICAL PHYSICS

收录：;EI(收录号：20134416907706);WOS:【SCI-EXPANDED(收录号:WOS:000321012400022)】；

基金：For financial support, we are grateful to the National Natural Science Foundation of China (Grant No. 20973062). L. W. acknowledges the funding from Scholarship for Excellence Programme jointly by Department for Business Innovation and Skills, United Kingdom and China Scholarship Council.

语种：英文

外文关键词：Paraffins - Statistical mechanics - Dimers - Iterative methods - Phase equilibria - Group theory

摘要：The renormalization-group (RG) approaches for fluids are employed to investigate critical asymmetry of vapour-liquid equilibrium (VLE) of fluids. Three different approaches based on RG theory for fluids are reviewed and compared. RG approaches are applied to various fluid systems: hard-core square-well fluids of variable ranges, hard-core Yukawa fluids, and square-well dimer fluids and modelling VLE of n-alkane molecules. Phase diagrams of simple model fluids and alkanes described by RG approaches are analyzed to assess the capability of describing the VLE critical asymmetry which is suggested in complete scaling theory. Results of thermodynamic properties obtained by RG theory for fluids agree with the simulation and experimental data. Coexistence diameters, which are smaller than the critical densities, are found in the RG descriptions of critical asymmetries of several fluids. Our calculation and analysis show that the approach coupling local free energy with White's RG iteration which aims to incorporate density fluctuations into free energy is not adequate for VLE critical asymmetry due to the inadequate order parameter and the local free energy functional used in the partition function. (C) 2013 AIP Publishing LLC.