MRI evidence for a "coffee-front effect" in drying porous media - École des Ponts ParisTech Access content directly
Journal Articles Physical Review E : Statistical, Nonlinear, and Soft Matter Physics Year : 2013

MRI evidence for a "coffee-front effect" in drying porous media

Emmanuel Keita
Pamela Françoise Faure
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  • PersonId : 993014
Stéphane Rodts
Philippe Coussot
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  • PersonId : 1101142

Abstract

After drying colloidal particles suspended in a porous medium a concentration gradient appears. Using 1H MRI we propose a protocol to observe simultaneously the distributions of air, liquid, and colloid through the unsaturated solid porous structure. Thus we show that the above phenomenon comes from a receding-front effect: The elements migrate towards the free surface of the sample and accumulate in the remaining liquid films. Our understanding of the process makes it possible to establish a simple model without diffusion predicting the drying rate and the concentration distribution in time, in excellent agreement with the experimental observations. © 2013 American Physical Society.
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Dates and versions

hal-00946113 , version 1 (03-05-2018)

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Emmanuel Keita, Pamela Françoise Faure, Stéphane Rodts, Philippe Coussot. MRI evidence for a "coffee-front effect" in drying porous media. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, 2013, 87 (6), ⟨10.1103/physreve.87.062303⟩. ⟨hal-00946113⟩
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