A scaling equation of state near the critical point and the stability boundary of a liquid

被引：7

作者：

Bezverkhii P.P. ^{[1
]}

Martynets V.G. ^{[1
]}

Matizen E.V. ^{[1
]}

机构：

[1] Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk 630090

来源：

Journal of Engineering Thermophysics | 2007年 / 16卷 / 3期

关键词：

Critical point; Equation of state; Isochoric thermal capacity;

D O I：

10.1134/S1810232807030083

中图分类号：

学科分类号：

摘要：

A new scaling equation of state is proposed to describe the equilibrium thermodynamic properties of liquids near the critical point. In distinction from the existing scaling equations, which are parametric, the new equation is nonparametric and is expressed directly in terms of the physical quantities (pressure, temperature, and so on). It creates a number of advantages for the traditional representation and data processing. The equation gives rise to a binodal, spinodal, and a curve of thermal capacity divergence (pseudospinodal). The equation is expressed in terms of reduced variables (the ratio of the deviation of a thermodynamic variable from its critical value to the critical value) and contains 3 system-dependent adjustable constants. With the help of this equation, we conducted an approximation of the experimental PVT data in the critical region of 4He, C 2H 4, and H 2O with a pressure error of 0.4% and carried out a calculation of the C v 4He thermal capacity with no more than 4% error using a three-system constant determined from the PVT data. © Pleiades Publishing, Ltd. 2007.

引用

页码：164 / 168

页数：4

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