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Bubbles breaking the wall: Two-dimensional stress and stability analysis / Jon Alm Eriksen, Benjy Marks, Bjørnar Sandnes, Renaud Toussaint, Bjornar Sandnes

Physical Review E, Volume: 91, Issue: 5

Swansea University Author: Bjornar Sandnes

Abstract

Suspensions can be deformed through rearrangement of grains during the motion of a gas-liquid interface. Regions of jammed beads at the interface, can lead to intermittent behavior in the dynamics. We study the stability of layers of saturated jammed beads around stuck air bubbles, and the deformati...

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Published in: Physical Review E
ISSN: 1539-3755 1550-2376
Published: 2015
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa21343
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Abstract: Suspensions can be deformed through rearrangement of grains during the motion of a gas-liquid interface. Regions of jammed beads at the interface, can lead to intermittent behavior in the dynamics. We study the stability of layers of saturated jammed beads around stuck air bubbles, and the deformation mechanism leading to air channel formations in these layers. We describe a two-dimensional extension of a previous model of the eective stress in the jammed packing. We discuss how the tangential stress component alters the yield stress, in particular how arching eects may impact the yield threshold. We further develop a linear stability analysis, to study undulations which develop under certain experimental conditions at the air-liquid interface. The linear analysis gives estimates for the most unstable wavelengths for the initial growth of the perturbations. The estimates correspond well with peak to peak length measurements of the experimentally observed undulations.
Keywords: Granular matter, pattern formation, multiphase flow, force chains, stress, linear stability analysis, DEM
College: College of Engineering
Issue: 5