Fine structure of boundary flows in media with diffusion and heat conduction

The influence of the boundary conditions at the surfaces confining multicomponent stratified media on the formation of flows in problems of multicomponent diffusion and thermoconcentration convection is investigated. Exact solutions of these problems are given. Analysis of these solutions shows that several boundary layers (concentration and velocity layers) are formed in the case of multicomponent diffusion, which leads to decomposition of the physical fields and splitting of the characteristic spatial scales. In the case of thermoconcentration convection, a more complicated dynamic structure is formed, which, besides boundary layers, includes injection fronts. The latter have a significant effect on the flow characteristics at distances far exceeding the thickness of the boundary layers.