文献类型：期刊文献

英文题名：Improved renormalization group theory for critical asymmetry of fluids

作者：Wang, Long[1];Zhao, Wei[1];Wu, Liang[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：139

期号：12

外文期刊名：JOURNAL OF CHEMICAL PHYSICS

收录：;EI(收录号：20134216868254);WOS:【SCI-EXPANDED(收录号:WOS:000325392000037)】；

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

语种：英文

外文关键词：Group theory - Statistical mechanics - Ising model - Equations of state - Liquids - Sulfur hexafluoride - Binary mixtures - Integral equations

摘要：We develop an improved renormalization group (RG) approach incorporating the critical vapor-liquid equilibrium asymmetry. In order to treat the critical asymmetry of vapor-liquid equilibrium, the integral measure is introduced in the Landau-Ginzbug partition function to achieve a crossover between the local order parameter in Ising model and the density of fluid systems. In the implementation of the improved RG approach, we relate the integral measure with the inhomogeneous density distribution of a fluid system and combine the developed method with SAFT-VR (statistical associating fluid theory of variable range) equation of state. The method is applied to various fluid systems including square-well fluid, square-well dimer fluid and real fluids such as methane (CH4), ethane (C2H6), trifluorotrichloroethane (C2F3Cl3), and sulfur hexafluoride (SF6). The descriptions of vapor-liquid equilibria provided by the developed method are in excellent agreement with simulation and experimental data. Furthermore, the improved method predicts accurate and qualitatively correct behavior of coexistence diameter near the critical point and produces the non-classical 3D Ising criticality. (C) 2013 AIP Publishing LLC.