An approximate method for the nonlinear diffusion problem with a power relation between diffusion coefficient and concentration—II. Computation of concentration profiles

Abstract The approximate method, developed in part I [Inf. J. Heat Mass Transfer25,1209–1220 (1982)] is extended with approximate relations for the computation of concentration profiles in a nonlinear desorption process with Dirichlet boundary conditions and a power-function variation of the diffusion coefficient with concentration. The relations are applicable to non-shrinking or shrinking systems with slab, cylindrical or spherical geometry.