Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session T32: Porous Media Flows: Mass and Heat Transfer II
4:25 PM–6:09 PM,
Monday, November 20, 2023
Room: 158AB
Chair: Simon Toedtli, Johns Hopkins University
Abstract: T32.00005 : Flow- and interface-driven compaction of a confined soft porous medium: When does friction matter?*
5:17 PM–5:30 PM
Presenter:
Callum Cuttle
(University of Oxford)
Authors:
Callum Cuttle
(University of Oxford)
Christopher W MacMinn
(University of Oxford)
Térence Desclaux
(Toulouse Institute of Fluid Mechanics - IMFT)
In this talk, we reveal the surprisingly prominent role friction can play in distorting these classical results. We perform experiments on water-saturated granular packings of hydrogel beads, which have extremely low friction coefficients, in a rectilinear Hele-Shaw cell. We find that, for piston-like compaction driven by the injection of a pressurised gas bubble, the compaction is strongly influenced by friction between the beads and the confining walls of the cell, resulting in solid stresses that are focused near the moving air-packing interface and screened further into the packing by friction. Accounting for frictional tangential stresses in a rigorous poromechanical model reveals that the frictional stress term is effectively amplified by a factor equal to the axial length of the packing divided by the depth of the cell. Hence, even very slippery porous media can exhibit friction-dominated compaction when strongly confined.
Consistent with previous studies of compaction in packings of hydrogel beads, we find a much weaker influence of frictional effects when compaction is driven by a background flow. We probe into the distinctions between flow- and piston-driven compaction using both experiments and modelling.
*This work was supported by the European ResearchCouncil (ERC) under the European Union's Horizon 2020 Programme [Grant No. 805469].
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