液体导热系数的自由体积模型  

Free Volume Models for Liquid Thermal Conductivity

作　　者：刘洪勤[1] 戴星[1] 

机构地区：[1]北京化工学院化工系,北京科技大学冶金系

出　　处：《高校化学工程学报》1995年第1期9-17,共9页Journal of Chemical Engineering of Chinese Universities

摘　　要：本文用统一的自由体积模型描述温度、压力和组成对稠密流体，尤其是液体的导热系数的影响。首先，对低压下纯液体的导热系数提出了简单的三参数关联式，对４３种纯物质、４４３个数据点的总平均误差仅为０．２６％；在此基础上，提出了液体混合的模型，其参数可视为与温度无关，对４３个二元体系，包括含水体系，计８６９个点的计算误差仅为２．３１％，优于被认为较成功的Ｔｅｊａ－Ｒｉｃｅ模型；最后，提出了适用于高压下，包括气液两相的稠密流体的导热系数的关联模型。An unified model has been proposed in this paper to correlate temperature, pressure and composition dependence for thermal conductivity of dense fluids, especially for liquids. A three parameter model has been derived for pure liquids, which gave the absolute average deviation(AAD) of 0. 26 per cent for 43 substances(443 data points). Then a model containing a temperature independent parameter has been proposed for liquid mixtures to predict thermal conductivities for 43 binary mixtures(869 data points) with AAD of 2. 31 per cent, the results obtained are better than those given by Teja and Rice's model. Finally, a five parameter model for dense fluids under high pressures has been obtained which correlated thermal conductivities for 13 subtances( 1064 data points) with AAD of 5. 18 per cent. For comparison, a very complicated model recently proposed by Hildwein and Stephan gave AAD of 7. 34 per cent for 4 substances of known PVT parameters(384 datapoints ).

关 键 词：导热系数 自由体积模型 纯液体 稠密流体 

分 类 号：TQ021.3[化学工程]