SEARCH Articles Figures Tables Diffusion dimensionless form Diffusion dimensionless groups Diffusion dimensionless time Diffusion equation dimensionless Diffusivity Dimensionless numbers Diffusivity Dimensionless time Dimensionless Dimensionless Form of the Generalized Mass Transfer Equation with Unsteady-State Convection, Diffusion, and Chemical Reaction Dimensionless diffusion flux The Nernst diffusion layer and dimensionless variables