高压气体及混合物导热系数的推算

化工上常用的计算高压气体导热系教的关联式均须有常压下的数据才能应用。最 近，Ｃｈｒｉｓｔｅｎｓｅｎ－Ｆｒｅｄｅｎｓｌｕｎｄ提出了三参数对比状态型的关联式弥补了这种缺陷， 但其推算精度较差。 本文分别对Ｃｒｏｏｋｓ－Ｄａｕｂｅｒｔ及 Ｃｈｒｉｓｔｅｎｓｅｎ－Ｆｒｅｄｅｎｓｌｕｎｄ公式加以修正，使 其精度显著提高。

Prediction of Thermal Conductivities for Dense Fluids and Mixtures

Methods for predicting the thermal conductivity of dense fluids are not conve- nient for chemical engineering application because they need data under atmospheric pressure. Recently a three-parameter corresponding states theorem was proposed by Christensen and Fredenslund, but its prediction accuracy did not appear to be as good as those of the conventional methods. In this paper, some modifications are proposed to improve the prediction ac- curacy of both the Crooks-Daubert and the Christensen-Fredenslund method. The great improvement obtained in this article will encourage further investigation.