摘要
针对Ｐｅｎｇ—Ｒｏｂｉｎｓｏｎ状态方程及Ｆｏｘ提出的标度变换方法，作者提出了两点修正．修正后的Ｆｏｘ方法可以移动计算所得的临界点，并满足过渡区的理论要求．对１５种纯流体的近临界区（０．９８＞Ｔｒ＞０．８３）的汽、液两相密度及饱和蒸汽压的计算结果表明，所提出的方法较原始Ｆｏｘ方法更为合理地描述了流体在临界区附近的性质。
Two modificahons are presented for the Peng-Robinson equation of state and the scaling method proposed by Fox. This modified Fox method can shift the calculated critical point and satisfy theoretical requirements for the transition region.The calculated results for liquid and vapor densities and saturated pressures or 15 pure fluids indicate that the method proposed here describes the properties near the critical region more rcsonablly than the Fox method with smooth transition from remote to near the critical region.
关键词
临界区
相平衡
标度律
流体
critical region
phase equilibrium
scaling law
