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Unexpected coupling between flow and adsorption in porous media

Abstract : We study the interplay between transport and adsorption in porous systems under a fluid flow, based on a lattice Boltzmann scheme extended to account for adsorption. We performed simulations on well-controlled geometries with slit and grooved pores, investigating the influence of adsorption and flow on dispersion coefficient and adsorbed density. In particular, we present a counterintuitive effect where fluid flow induces heterogeneity in the adsorbate, displacing the adsorption equilibrium towards downstream adsorption sites in grooves. We also present an improvement of the adsorption-extended lattice Boltzmann scheme by introducing the possibility for saturating Langmuir-like adsorption, while earlier work focused on linear adsorption phenomena. We then highlight the impact of this change in situations of high concentration of adsorbate.
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Jean-Mathieu Vanson,, François-Xavier Coudert, Benjamin Rotenberg, Maximilien Levesque, Caroline Tardivat, et al.. Unexpected coupling between flow and adsorption in porous media. Soft Matter, Royal Society of Chemistry, 2015, 11 (30), pp.6125-6133. ⟨10.1039/c5sm01348h⟩. ⟨hal-01308089⟩



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