Wicking in a Powder

Abstract : We investigate the wicking in granular media by considering layers of grains at the surface of a liquid and discuss the critical contact angle below which spontaneous impregnation takes place. This angle is found to be on the order of 55 for monodisperse layers, significantly smaller than 90, the threshold value for penetrating assemblies of tubes. Owing to geometry, impregnating grains is more demanding than impregnating tubes. We also consider the additional effects of polydispersity and pressure on this wetting transition and discuss the corresponding shift observed for the critical contact angle.
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https://hal-polytechnique.archives-ouvertes.fr/hal-00994467
Contributeur : Denis Roura <>
Soumis le : lundi 26 mai 2014 - 15:07:34
Dernière modification le : jeudi 10 mai 2018 - 02:02:28

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P. S. Raux, H. Cockenpot, M. Ramaioli, David Quéré, Christophe Clanet. Wicking in a Powder. Langmuir, American Chemical Society, 2013, 29 (11), pp.3636-3644. 〈10.1021/la400015v〉. 〈hal-00994467〉

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