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Granular Convection in Microgravity

Murdoch, Naomi and Rozitis, B. and Nordstrom, K. and Green, S. F. and Michel, Patrick and Lophem, T.-L. de and Losert, W. Granular Convection in Microgravity. (2013) Physical Review Letters, 110 (1). ISSN 0031-9007

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.110.018307

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:Article
Additional Information:Thanks to American Physical Society editor. The definitive version is available at https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.110.018307
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Université Nice Sophia Antipolis (FRANCE)
Other partners > Observatoire de la Côte d'Azur (FRANCE)
Other partners > University of Maryland (USA)
Other partners > The Open University (United Kingdom)
Laboratory name:
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Deposited By: Naomi Murdoch
Deposited On:25 Apr 2017 13:58

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