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Evaporation in capillary porous media at the perfect piston-like invasion limit: Evidence of non-local equilibrium effects

Moghaddam, Alireza Attari and Prat, Marc and Tsotsas, Evangelos and Kharaghani, Abdolreza Evaporation in capillary porous media at the perfect piston-like invasion limit: Evidence of non-local equilibrium effects. (2017) Water Resources Research, 53 (12). 10433-10449. ISSN 0043-1397

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Official URL: https://doi.org/10.1002/2017WR021162

Abstract

The classical continuum modeling of evaporation in capillary porous media is revisited from pore network simulations of the evaporation process. The computed moisture diffusivity is characterized by a minimum corresponding to the transition between liquid and vapor transport mechanisms confirming previous interpretations. Also the study suggests an explanation for the scattering generally observed in the moisture diffusivity obtained from experimental data. The pore network simulations indicate a noticeable nonlocal equilibrium effect leading to a new interpretation of the vapor pressure‐saturation relationship classically introduced to obtain the one‐equation continuum model of evaporation. The latter should not be understood as a desorption isotherm as classically considered but rather as a signature of a nonlocal equilibrium effect. The main outcome of this study is therefore that nonlocal equilibrium two‐equation model must be considered for improving the continuum modeling of evaporation.

Item Type:Article
Additional Information:Thanks to American Geophysical Union (AGU) publications. The original PDF of the article can be found at : https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2017WR021162
HAL Id:hal-01795775
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)
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Funders:
German Research Foundation (DFG)
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Deposited On:18 May 2018 14:57

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