一种提高低温流体比体积计算精度的方法  

A METHOD TO IMPROVE THE ACCURACY OF MOLAR VOLUME PREDICTION FOR CRYOGENIC FLUIDS

作　　者：钟永芳[1] 陈光明[1] 

机构地区：[1]浙江大学制冷与低温研究所,杭州310027

出　　处：《低温工程》2002年第3期44-47,共4页Cryogenics

摘　　要：采用了一个既能提高立方型状态方程比体积计算精度 ,又不影响气液平衡条件的简单摩尔修正项来改进PR方程比体积的计算。本文对 1 9种低温流体给出其修正项的值 ,计算饱和蒸气和液体比体积 ,并与未修正的PR方程的计算值比较 ,结果表明这种修正能显著提高低温流体 (包括量子流体氢、氦和强极性的氨气 )饱和液体比体积的计算精度 ,并对蒸气比体积的计算也略有改进。The saturated liquid and vapor molar volume of 19 common used cryogenic fluids were calculated using a modified Peng-Robinson equation of state by translating the calculated volumes without changing the predicted phase equilibria.Comparison of the results with modified and original PR equations showed that the accuracy of saturated liquid molar volume,especially such quantum gases as He,H 2 and polar gas NH 3 has been improved greatly.In addition there is a slight improvement in vapor molar volume prediction.

关 键 词：低温流体 比体积 立方型状态方程 计算精度 

分 类 号：O414.12[理学—理论物理]