Abstract
When a compressible gas displaces a granular mixture in a quasi 2D space, friction causes stick slip motion. A localized slip event at the interface allows expansion of the compressed gas and a sudden forward motion of the front. The reservoir volume of gas determines the available elasticity in the system, and thereby the size of the expansion. Large expansions take the shape of bubbles, and in this paper we study the accumulation of granular material around the inflating gas bubble, and the rheological response of the system during this short expansion phase.
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Sandnes, B., Flekkøy, E.G. & Måløy, K.J. Stick slip displacement of confined granular mixtures: Bubble expansion. Eur. Phys. J. Spec. Top. 204, 19–25 (2012). https://doi.org/10.1140/epjst/e2012-01549-7
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DOI: https://doi.org/10.1140/epjst/e2012-01549-7