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Title: The long cross-over dynamics of capillary imbibition
Author: Ruiz-Gimenez, E.
Armstrong, S.
Leveque, A.
Michel, C.
Pagonabarraga Mora, Ignacio
Wells, G.G.
Hernández Machado, Aurora
Ledesma Aguilar, Rodrigo Andrés
Keywords: Capil·laritat
Dinàmica de fluids
Fluid dynamics
Issue Date: 6-Jul-2022
Publisher: Cambridge University Press
Abstract: Spontaneous capillary imbibition is a classical problem in interfacial fluid dynamics with a broad range of applications, from microfluidics to agriculture. Here we study the duration of the cross-over between an initial linear growth of the imbibition front to the diffusive-like growth limit of Washburn's law. We show that local-resistance sources, such as the inertial resistance and the friction caused by the advancing meniscus, always limit the motion of an imbibing front. Both effects give rise to a cross-over of the growth exponent between the linear and the diffusive-like regimes. We show how this cross-over is much longer than previously thought - even longer than the time it takes the liquid to fill the porous medium. Such slowly slowing-down dynamics is likely to cause similar long cross-over phenomena in processes governed by wetting.
Note: Reproducció del document publicat a:
It is part of: Journal of Fluid Mechanics, 2022, vol. 939, p. A39
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ISSN: 0022-1120
Appears in Collections:Articles publicats en revistes (Institut de Nanociència i Nanotecnologia (IN2UB))
Articles publicats en revistes (Física de la Matèria Condensada)
Articles publicats en revistes (Institut de Recerca en Sistemes Complexos (UBICS))

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