Diffusion in multiphase systems with nonstationary boundaries

In this work the problem of diffusion in the definite diffusion field whose one boundary is fixed and the other — interphase boundary — moves in time according to the parabolic law. The mathematical problem is solved exactly by means of thermal potentials of a double layer. The solution of the diffusion equation in the proximity to the boundary was derived and the concentration gradients on these boundaries were calculated. The numerical procedure of determining the diffusion characteristics from experimental concentration gradients on the phase boundaries was presented. As the zero approximation the result of calculations according to Wagner’s solution was used. Theory. Numerical calculations.