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Enhanced transport in a porous medium due to dissolved salt

G. Licsandru and M. Prat*

  • Institut de Mécanique des Fluides de Toulouse (IMFT), Université de Toulouse, CNRS, IMFT, 31400 Toulouse, France

  • *mprat@imft.fr
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Phys. Rev. Fluids 7, 064304 – Published 9 June, 2022

DOI: https://doi.org/10.1103/PhysRevFluids.7.064304

Abstract

An experiment is presented showing enhanced water transport across a porous layer compared to pure water vapor diffusion. The enhanced transport is explained by the presence of brine in the layer and the dependence of the equilibrium vapor pressure with the dissolved salt concentration. The impact of the salt presence is further demonstrated by a comparison with the case of pure water. A significantly longer period of sustained evaporation is obtained in the presence of salt. The transport enhancement effect can last over long periods of time when the conditions are such that the porous layer reaches a dynamic equilibrium between condensation and evaporation. Also, the porous layer can adapt to changes in the boundary conditions via changes in the brine saturation and associated modifications in the salt concentration and the equilibrium vapor pressure. The transport enhancement effect is also illustrated in relation with the dynamics of salt crusts.

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Phys. Rev. Fluids 7, 064304– Published 9 June, 2022
  • Received 18 February 2022
  • Accepted 24 May 2022
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