DIFFUSION-LIMITED LAYER GROWTH IN SPHERICAL GEOMETRY - A NUMERICAL APPROACH

In this article we present a detailed numerical analysis of the proble m of diffusion-controlled growth of a solid intermediate phase from tw o saturated solutions (solid solute and solid or liquid solvent). Sphe rical geometry is considered and the quasi-steady-state approximation used in earlier analytical models is eliminated. Comparison between ou r results and those from Larson's model allows us to conclude that the use of a numerical scheme may lead to a significant gain in accuracy except when a solute-rich sphere is converting into a dilute phase. (C ) 1996 American Institute of Physics.