由虚拟粘度概念求无限稀释液相扩散系数

CALCULATION OF LIQUID DIFFUSION COEFFICIENTS AT INFINITE DILUTION FROM PSEUDOVISCOSITY CONCEPT

依据理论模型推导出由虚拟粘度概念估算无限稀释液相扩散系数的关系式.虚拟粘度可由混合物粘度确定,也可从纯物质的粘度估算.仅由纯物质粘度计算虚拟粘度,本文方程对50个扩散系数的估算误差为10.6%,而Wilke—Chang方程和Tyn-Calus方程的估算误差分别为22.9%和14.2%.

A correlation for predicting liquid diffusion coefficients at infinite dilution was developed based on theoretical models. In the correlation, a concept of pseudoviscosity was used, which could be determined from the viscosity of mixtures, or estimated from the viscosity of pure components. The average absolute deviation for 50 diffusion coefficient data was 10.6% by using the pseudoviscosities calculated from the pure component viscosities, while those calculated by the Wilke-Chang equation and Tyn-Calus equation were 22.9% and 14.2% respectively.