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Locus of first crystals on the evaporative surface of a vertically textured porous medium

Diouf, Babacar and Geoffroy, Sandrine and Abou-Chakra, Ariane and Prat, Marc Locus of first crystals on the evaporative surface of a vertically textured porous medium. (2018) The European Physical Journal Applied Physics, 81 (1). 1-14. ISSN 1286-0042

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Official URL: https://doi.org/10.1051/epjap/2018170340

Abstract

The evaporation of a saline solution from a heterogeneous porous medium formed by the assembly of a coarse medium column and a fine medium column is studied numerically. We concentrate on the locus of the formation of first crystals on the evaporative surface from the computation of the ion mass fraction distribution at the surface prior to the efflorescence development. Two basic situations considered in previous works, namely the evaporation–wicking situation and the drying situation are considered. The study makes clear that each situation leads to a markedly different locus of the efflorescence formation, except, however, for very high initial salt concentrations. The study emphasizes the key-role of the velocity field induced in the porous domain in the case of the evaporation–wicking situation. In the case of the drying situation, a key aspect lies in the local increase in the ion mass fraction due to the local desaturation, i.e. the local shrinking of the liquid volume containing the ions.

Item Type:Article
HAL Id:hal-01876338
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Laboratory name:
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Deposited By: Marc PRAT
Deposited On:16 Jan 2019 13:16

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