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Evaporation-driven growth of large crystallized salt structures in a porous medium

Sghaier-Ben Chiekh, Nour and Geoffroy, Sandrine and Prat, Marc and Eloukabi, Houda and Ben Nasrallah, Sassi Evaporation-driven growth of large crystallized salt structures in a porous medium. (2014) Physical Review E, 90 (4). 1-6. ISSN 1539-3755

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Official URL: http://dx.doi.org/10.1103/PhysRevE.90.042402

Abstract

Subflorescence refers to crystallized salt structures that form inside a porous medium. We report a drying experiment revealing major development of subflorescence in the dry region of the porous medium away from the liquid zone. Using a combination of image analyses and numerical computations, we show that the growth is directly correlated to the evaporation flux distribution along the boundary of the growing salt structure. This indicates that the salt is transported into the domain occupied by the salt structure in the porous medium up to the structure periphery, where salt deposition takes place. This is confirmed when a growing salt structure encounters dry subflorescence formed earlier during the drying process. The dry subflorescence is reimbibed and resumes its growth. The analysis also suggests that the solution within the growing subflorescence is in equilibrium with the crystallized salt wall. These results shed light on the growth mechanisms of subflorescence, a phenomenon that can play a fundamental role in several important issues such as carbon dioxide sequestration or salt weathering.

Item Type:Article
Additional Information:Thanks to American Physical Society editor. The definitive version is available at http://journals.aps.org The original PDF of the article can be found at American Physical Society website : http://dx.doi.org/10.1103/PhysRevE.90.042402 This papers appears in Volume 90: Physical Review E. ISSN: 1539-3755.
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)
Other partners > Université de Monastir - UM (TUNISIA)
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Deposited By: Marc PRAT
Deposited On:23 Jun 2015 08:21

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