MH(81)状态方程与高压液体热导率的计算

假设液体由微型晶型晶粒和空穴组成，在有效结构理论基础上结合晶体学和气体分子运动论的方法，推导出一个双参数热导率表达式，能够较好地适用于不同液体物质热导率的关联。该模型特征参数的数值和符号一定程度上反映了液体的结构特点和导热机理，并且与物质的晶体结构常数间有良好定量关系，显示出较为明确的物理意义；该模型把属于传递性质的热导率与物质的pVT等平衡性质联系起来，为状态方程在热导率推算中应用构筑闻桥梁。用MH（81）状态方程计算了具有代表性的19种纯物质的饱和液体热导率和10种纯物质的高压（0．1－50MPa)液体热导率，总体平均偏差分别为1．4％和3．7％。说明该模型结合合适的状态方程可以大大拓宽温度和压力的适用范围，有利于实际应用。

MH (81) equation of state and calculation of liquid thermal conductivity at high pressure

On the supposition that a liquid is composed of microcrystallites and vacancies and on the basis of significant structure theory, a new two-parameter model was proposed from the view of crystallography and kinetic theory of gases. It was applied to the correlation of the thermal conductivity of different liquids with satisfactory results. The values of two characteristic parameters can reflect, to a certain dgree, the structure of a liquid and its mechanism of heat transfer. A good quantitative relationship between one of the characteristic parameters and the crystal cell constants of substances was found. It follows that the values of two characteristic parameters have a reasonable physical significance. The thermal conductivity model relates this non equilibrium property to the equilibrium pVT properties and enables the generalized equation of state (EOS) to be applied to the calculation of the liquid thermal conductivity. The MH (81) equation of state was used to calculate the thermal conductivity for 19 pure liquids under different saturated conditions and for 10 pure liquids at the pressure range from 0.1 MPa to 50 MPa with the overall average relative deviations of 1.4% and 3.7%, respectively, in comparison with the literature data. These results indicate that the thermal conductivity model along with an appropriate equation of state has an extended application in practical processes.