硬球理论用于液相扩散系数的关联

EXTENSION OF HARD SPHERE MODEL TO LIQUID DIFFUSION COEFFICIENT PREDICTION

硬球理论的基础是Maxwell－Boltzman的统计力学理论，最早由Chapman等将该理论应用于研究稀薄气体的传递性质。在稠密流体中，必须考虑分子碰撞频率大幅度增加的影响因素。 Dymond等认为该影响与分子接触径向分布函数g(σ)有关。

In terms of the hard sphere, a model equation has been developed to correlate mutual diffusion coefficients with concentrations. By appling to 36 binary systems, the equation proposed has higher accuracy and applicability, and it can be used to predict the diffusion coefficients at different temperature from the data at one given temperature. At the same time, the liquid diffusion coefficient at infinite dilution over an extended temperature and pressure range can be accurately correlated and calculated with the equation deduced from the model.