R-K状态方程及P-R状态方程下的气-液转变和临界行为

The Gas-Liquid Transition and Critical Behavior Predicted by the State Equations of R-K and P-R

分别由Redlich与Kwong以及Peng与Robinson所提出的状态方程具有许多优越性质,是近年来在计算纯物质热力学函数中用得最多的状态方程.本文以其维里级数展开为基础,利用Pade逼近为工具,讨论了这类气体的气-液转变和临界点附近的行为。

The popular two-parameter cubic equation of state proposed by Redlich-Kwong and Peng-Robinson possess virial coefficients to all order. This feature is exploited in the present study, Where by the series expansions in powers of density for both equations are analyzed employing the Pade approxi- mant in an effort to predict the condensed phase branch. The behavior of the thermodynamic prop- erties inherent to both these models in the near-critical region is also examined.