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Capillary bulldozing of sedimented granular material confined in a millifluidic tube / Guillaume Dumazer, Bjornar Sandnes, Knut Jørgen Måløy, Eirik G. Flekkøy

Physical Review Fluids, Volume: 5, Issue: 3

Swansea University Author: Bjornar Sandnes

Abstract

The motion of a capillary interface across a deformable granular material in a confined geometry shows the complex interplay between viscous forces, solid friction and capillary forces. In a horizontal quasi one-dimensional geometrical confinement, a millifluidic tube, the displacement of a three-ph...

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Published in: Physical Review Fluids
ISSN: 2469-990X
Published: American Physical Society (APS) 2020
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa53645
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Abstract: The motion of a capillary interface across a deformable granular material in a confined geometry shows the complex interplay between viscous forces, solid friction and capillary forces. In a horizontal quasi one-dimensional geometrical confinement, a millifluidic tube, the displacement of a three-phase flow consisting of two fluids and a mobile granular phase exhibits viscous or frictional displacement regimes, as shown in [{} 117 , 028002 (2016)]. In the present paper we explore in details the dynamics in both regimes by making use of a new set of data. The viscous displacement regime which is characterized by a fluidization of the immersed granular material dragged by the flow driving the displacement of the capillary interface is interpreted from a rheological point of view. The frictional displacement regime which displays a self-structuring of the granular material left in the tube behind the invading capillary interface, is interpreted with a model based on the Janssen’s law able to predict the typical size of the plugs obtained.
Issue: 3