Capillary bulldozing of sedimented granular material confined in a millifluidic tube

Guillaume Dumazer, Bjørnar Sandnes, Knut Jørgen Måløy, and Eirik G. Flekkøy
Phys. Rev. Fluids 5, 034309 – Published 30 March 2020

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 [Phys. Rev. Lett. 117, 028002 (2016).]. In the present paper we explore in detail 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 by using a model based on the Janssen law to predict the typical size of the plugs obtained.

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  • Received 25 March 2019
  • Accepted 26 February 2020

DOI:https://doi.org/10.1103/PhysRevFluids.5.034309

©2020 American Physical Society

Physics Subject Headings (PhySH)

Nonlinear DynamicsFluid DynamicsPolymers & Soft Matter

Authors & Affiliations

Guillaume Dumazer1,2, Bjørnar Sandnes3, Knut Jørgen Måløy1, and Eirik G. Flekkøy1

  • 1PoreLab, The Njord center, University of Oslo, P.O. Box 1048 Blindern Oslo, Norway
  • 2Mines Saint-Etienne, Univ. Lyon, CNRS, UMR 5307 LGF, Centre SPIN, F-42023 Saint-Etienne, France
  • 3College of Engineering, Swansea University, Bay Campus, Swansea SA1 8EN, United Kingdom

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Vol. 5, Iss. 3 — March 2020

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