Forced and natural convective mass transfer in multicomponent gaseous mixtures

The use of the Chilton‐Colburn analogy to obtain an effective film thickness over which the Stefan‐Maxwell equations can be integrated was confirmed for binary mixtures and found applicable for ternary, quaternary, and presumably higher order mixtures under conditions of nonequimolal counterdiffusion in a differential convective flow system. A method of averaging binary diffusivities was developed for use in computing the Schmidt number in these multicomponent systems. It was also found necessary to modify the usual Sherwood number, if there was a large molecular weight change across the diffusion barrier when the Chilton‐Colburn analogy was employed.