The collapse of a granular column in a viscous liquid is experimentally investigated. The morphology of the deposits is shown to be mainly controlled by the initial volume fraction of the granular mass and not by the aspect ratio of the column, an observation which differs from dry granular collapse. Two different regimes are identified corresponding to initially loose and dense packings. Loose packings give rise to thin and long deposits, the dynamics being fast. A positive liquid pressure is measured below the column. For dense packings, the runout distance is twice less, the flow is slow, and a negative pore pressure is measured during the flow. These observations suggest that the dynamics of the granular collapse in a fluid is strongly affected by the dilatancy or contractancy behavior of the granular medium.
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July 2011
Research Article|
July 01 2011
Granular collapse in a fluid: Role of the initial volume fraction
L. Rondon;
L. Rondon
a)
Laboratoire IUSTI, UMR 6595 CNRS,
Aix Marseille University
, 5 rue Enrico Fermi, 13465 Marseille Cedex 13, France
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O. Pouliquen;
O. Pouliquen
b)
Laboratoire IUSTI, UMR 6595 CNRS,
Aix Marseille University
, 5 rue Enrico Fermi, 13465 Marseille Cedex 13, France
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P. Aussillous
P. Aussillous
c)
Laboratoire IUSTI, UMR 6595 CNRS,
Aix Marseille University
, 5 rue Enrico Fermi, 13465 Marseille Cedex 13, France
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a)
Electronic mail: loic.rondon@polytech.univ-mrs.fr.
b)
Electronic mail: olivier.pouliquen@univ-provence.fr.
c)
Electronic mail: pascale.aussillous@polytech.univ-mrs.fr.
Physics of Fluids 23, 073301 (2011)
Article history
Received:
December 24 2010
Accepted:
May 05 2011
Citation
L. Rondon, O. Pouliquen, P. Aussillous; Granular collapse in a fluid: Role of the initial volume fraction. Physics of Fluids 1 July 2011; 23 (7): 073301. https://doi.org/10.1063/1.3594200
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