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Granular convection in microgravity

Murdoch, N.; Rozitis, B.; Nordstrom, K.; Green, S. F.; Michel, P.; de Lophem, T.-L. and Losert, W. (2013). Granular convection in microgravity. Physical Review Letters, 110(1), article no. 018307.

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DOI (Digital Object Identifier) Link: http://doi.org/10.1103/PhysRevLett.110.018307
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Abstract

We investigate the role of gravity on convection in a dense granular shear flow. Using a microgravity-modified Taylor-Couette shear cell under the conditions of parabolic flight microgravity, we demonstrate experimentally that secondary, convective-like flows in a sheared granular material are close to zero in microgravity, and enhanced under high gravity conditions, though the primary flow fields are unaffected by gravity. We suggest that gravity tunes the frictional particle-particle and particle-wall interactions, which have been proposed to drive the secondary flow. In addition, the degree of plastic deformation increases with increasing gravitational forces, supporting the notion that friction is the ultimate cause.

Item Type: Journal Article
Copyright Holders: 2013 American Physical Society
ISSN: 0031-9007
Extra Information: 5 pp.
Academic Unit/Department: Science > Physical Sciences
Science
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
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Item ID: 36569
Depositing User: Simon Green
Date Deposited: 08 Feb 2013 10:50
Last Modified: 18 Jan 2016 16:24
URI: http://oro.open.ac.uk/id/eprint/36569
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