Abstract
The possibility of obtaining analytical estimates in a diffusion approximation of the times needed by nonequilibrium small bodies to relax to their equilibrium states based on knowledge of the mass transfer coefficient is considered. This coefficient is expressed as the product of the self-diffusion coefficient and the thermodynamic factor. A set of equations for the diffusion transport of mixture components is formulated, characteristic scales of the size of microheterogeneous phases are identified, and effective mass transfer coefficients are constructed for them. Allowing for the developed interface of coexisting and immiscible phases along with the porosity of solid phases is discussed. This approach can be applied to the diffusion equalization of concentrations of solid mixture components in many physicochemical systems: the mutual diffusion of components in multicomponent systems (alloys, semiconductors, solid mixtures of inert gases) and the mass transfer of an absorbed mobile component in the voids of a matrix consisting of slow components or a mixed composition of mobile and slow components (e.g., hydrogen in metals, oxygen in oxides, and the transfer of molecules through membranes of different natures, including polymeric).
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Original Russian Text © Yu.K. Tovbin, 2017, published in Zhurnal Fizicheskoi Khimii, 2017, Vol. 91, No. 8, pp. 1243–1255.
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Tovbin, Y.K. Diffusion relaxation times of nonequilibrium isolated small bodies and their solid phase ensembles to equilibrium states. Russ. J. Phys. Chem. 91, 1361–1372 (2017). https://doi.org/10.1134/S0036024417080350
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DOI: https://doi.org/10.1134/S0036024417080350