二氧化碳在正十四烷中与浓度有关的扩散系数

Concentration-Dependent Diffusion Coefficient for Carbon Dioxide in N-tetradecane

基于Reamer等的扩散理论 ,测量了 3 11K、1.90 5MPa下二氧化碳在正十四烷中的常扩散系数。根据短时间内扩散量与时间平方根之间存在着线性关系 ,引入不定函数Ft 描述与浓度有关的扩散过程 ,得到了二氧化碳 正十四烷体系与浓度有关的扩散系数数据 。

The binary diffusion coefficients of CO_2 in n-tetradecane were measured at 311.0K and 1.905MPa on the basis of the constant diffusivity theory of Reamer et al. According to the linear relationship between gas injection volume with square root of time for short time region, an uncertainty function F_t was introduced to describe the concentration-dependent diffusion process. The new method has been tested in the binary diffusion of the CO_2+n-tetradecane system, which has further developed the Fick diffusion theory.