Nonequilibrium thermodynamics and boundary conditions for reaction and transport in heterogeneous media

Publication Type:

Journal Article

Authors:

Source:

Journal of Chemical Physics, American Institute of Physics Inc., Volume 148, Number 19 (2018)

Keywords:

Concentration gradients, Fluid-solid interfaces, Interfacial currents, Interfacial thermodynamics, Non equilibrium thermodynamics, Reciprocal relations, Surface reactions, Tangential components, Thermodynamics, Thin-layer approximation

Abstract:

<p>Nonequilibrium interfacial thermodynamics is formulated in the presence of surface reactions for the study of diffusiophoresis in isothermal systems. As a consequence of microreversibility and Onsager-Casimir reciprocal relations, diffusiophoresis, i.e., the coupling of the tangential components of the pressure tensor to the concentration gradients of solute species, has a reciprocal effect where the interfacial currents of solutes are coupled to the slip velocity. The presence of surface reactions is shown to modify the diffusiophoretic and reciprocal effects at the fluid-solid interface. The thin-layer approximation is used to describe the solution flowing near a reactive solid interface. Analytic formulas describing the diffusiophoretic and reciprocal effects are deduced in the thin-layer approximation and tested numerically for the Poiseuille flow of a solution between catalytic planar surfaces. © 2018 Author(s).</p>

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