低密度非平衡态气体的内摩擦系数计算

Calculation of Internal Friction Coefficient for Nonequilibrium Gases at Low Density

气体的内摩擦现象是气体内大量分子无规则运动输运定向动量的结果,内摩擦现象的微观机制与分子热运动直接联系。内摩擦系数与气体的种类和状态有关,随着温度的升高,内摩擦系数逐步增大。本文从气体原子间相互作用的模型势出发,利用对应态原理,系统计算了处于非平衡态的五种低密度气体在不同温度下内部迁移的内摩擦系数的理论值,并将计算结果与J.Kestin等人所拟合的最佳值进行比较,结果符合得较好。

The internal friction of a gas is ascribed to the momenta transferred by a mass of molecules in molecular ruleless movement,and the internal friction coefficient of the gas is related to the variety of the gas.The microcosmic inbeing of internal friction depends on the temperature of the non-equilibrium state gas,and a great number of experimental investigations indicate that the higher the temperature is,the bigger the internal friction coefficient of a gas is.In this paper,the internal friction coefficients of five non-equilibrium state gases at low density are calculated using Tang-Tiennies potential model and the corresponding state principle.The results are compared with the best ones given by J.Kestin et al and good agreement is attained.