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Drying a simple suction process

Abstract : Drying of porous medium has been so far essentially considered as a complex process resulting from the competition between capillary, viscous and vapor diffusion effects inside the material, requiring sophisticated modelling approaches. We show that, in contrast with the usual assumption of dry front formation in the last stages of the process, there exists a continuous liquid film ensuring the transport of liquid throughout a hydrophilic porous medium and this at any time during its convective drying. This leads to a change of paradigm drying simply results from the suction of liquid imposed by the evaporation along the available liquid-air interface at the sample free surface. As a consequence, the drying rate of a material with a given structure type can be described by a unique master curve for the saturation vs time scaled by initial drying rate, whatever the pore size (or, equivalently, the permeability), the sample height and the air flux velocity, and whatever the resulting liquid distribution in the porous medium (more or less heterogeneous).
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Submitted on : Wednesday, October 30, 2019 - 3:17:15 PM
Last modification on : Monday, May 9, 2022 - 10:58:01 AM


  • HAL Id : cea-02339745, version 1




Mn. Benabdelouahab, A. Gossard, Stéphane Rodts, Philippe Coussot. Drying a simple suction process. Physical Review Letters, American Physical Society, 2018. ⟨cea-02339745⟩



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