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Kinematics in a slowly drying porous medium: Reconciliation of pore network simulations and continuum modeling

Moghaddam, Alireza Attari and Kharaghani, Abdolreza and Tsotsas, Evangelos and Prat, Marc Kinematics in a slowly drying porous medium: Reconciliation of pore network simulations and continuum modeling. (2017) Physics of Fluids, 29 (2). 1 -13. ISSN 1070-6631

(Document in English)

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Official URL: https://dx.doi.org/10.1063/1.4975985


We study the velocity field in the liquid phase during the drying of a porous medium in the capillaritydominated regime with evaporation from the top surface. A simple mass balance in the continuum framework leads to a linear variation of the filtration velocity across the sample. By contrast, the instantaneous slice-averaged velocity field determined from pore network simulations leads to step velocity profiles. The vertical velocity profile is almost constant near the evaporative top surface and zero close to the bottom of the sample. The relative extent of the two regions with constant velocity is dictated by the position of the most unstable meniscus. It is shown that the continuum and pore network results can be reconciled by averaging the velocity field obtained from the pore network simulations over time. This opens up interesting prospects regarding the transport of dissolved species during drying. Also, the study reveals the existence of an edge effect, which is not taken into account in the classical continuum models of drying.

Item Type:Article
Additional Information:Thanks to American Institute of Physics (AIP) editor. The original PDF of the article can be found at Physics of Fluids website : https://aip.scitation.org/doi/10.1063/1.4975985
HAL Id:hal-01798170
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 - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Otto Von Guericke Universität Magdeburg - OVGU (GERMANY)
Laboratory name:
German Research Foundation (DFG)
Deposited On:23 May 2018 09:16

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