Chemical Diffusion; Bi-velocity Method

摘要

In 1948 Darken has shown that lattice site are not conserved during diffusion process in solids. The resulting evolution of the understanding of the mass transport phenomena in solids and liquids allowed integrating the phenomenological models. In this work the proper choice of the coordinate axes for diffusion is defined basing on the volume continuity equation and the method of practical applications in the multiphase systems is shown. This new fundamental formula defines the volume-fixed frame of reference in the multicomponent solid,gas and liquid solutions. It will be shown that the method can be used in chemistry and mechano-chemistry.