液体的导热系数与蒸发潜热及温度间的关系

CORRELATIONS OF LIQUID THERMAL CONDUCTIVITY WITH THE HEAT OF VAPORIZATION AND TEMPERATURE

提出了流体导热系数的自由体积模型,用方阱流体的分子动力学模拟结果验证了模型,获得满意的结果.将所得模型结合统计力学理论,导出了液体的导热系数与蒸发潜热间的关系,对40种有代表性的物质(569个点)的关联,误差仅为1.78%,最后得到关联导热系数与温度的两参数模型,对40种物质的关联结果表明,所得模型适用于直到临界点附近的宽广的温度范围,优于被认为较成功的Jamieson的两参数经验式.

A model based on the concepts of free volume and activation energy was proposed to correlate fluid thermal conductivity. Firstly, the validity of this model was tested in terms of the results of molecular simulation on the square well fluid. Then, a correlation of liquid thermal conductivity with the heat of vaporization was derived by introducing the cell theory for liquids. For 40 diverse systems encountered in practice, the grand absolute average deviation is 1. 78 percent for 569 data points. Finally, a two parameter model correlating liquid thermal conductivity with temperature was presented. The correlation results of this model indicate that our method is superior to Jamieson model in a wide temperature range for most substances tested in this work.