液相扩散系数与浓度的新关联方程和实验考察

A New Equation Correlating Liquid Diffusion Coefficient with Concentration and Experimental Investigation

用液相扩散新型金属膜池考察了含有长链分子的五个二元体系在25℃时不同浓度的扩散系数,得出了扩散系数与浓度的经验关联多项式的参数拟合值.推导了二元液相扩散系数与浓度的新关联方程:D_(AB)η/V=(D°_(BA)η_A/V_A)^(φA)(D°_(AB)η_B/V_B)^(φB)β用上列方程及其他用于比较的方程对23种体系(207点)进行了预估计算,其总平均百分偏差如下:结果表明,在无拟合参数的方程中,本文所提方程(22)的总平均百分偏差为最小.

A new liquid-diffusion cell with metallic diaphragm has been applied to investigate the diffusion coefficients of five binary systems containing longchain molecules at various concentrations. The parameter values of the empirical poly-nominal correlating diffusion coefficient with concentration have been obtained by data fitting. A new equation correlating diffusion coefficient with concentration has been derived (22) This equation and other six equations used for comparison have been applied for prediction to 23 systems(207 points)with grand % deviations shown below: * With one empirical parameter It shows that, among the equations without empirical parameter, Eq. (22) of this paper has the lowest value.