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Granular shear flow in varying gravitational environments

Murdoch, Naomi and Rozitis, B. and Green, S. F. and De Lophem, T.-L. and Michel, Patrick and Losert, W. Granular shear flow in varying gravitational environments. (2013) Granular Matter, 15 (2). 129-137. ISSN 1434-5021

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Official URL: http://dx.doi.org/10.1007/s10035-013-0395-y

Abstract

Despite their very lowsurface gravities, asteroids exhibit a number of different geological processes involving granular matter. Understanding the response of this granular material subject to external forces in microgravity conditions is vital to the design of a successful asteroid sub-surface sampling mechanism, and in the interpretation of the fascinating geology on an asteroid. We have designed and flown a Taylor–Couette shear cell to investigate granular flow due to rotational shear forces under the conditions of parabolic flight microgravity. The experiments occur under weak compression. First, we present the technical details of the experimental design with particular emphasis on how the equipment has been specifically designed for the parabolic flight environment. Then, we investigate how a steady state granular flow induced by rotational shear forces differs in varying gravitational environments. We find that the effect of constant shearing on the granular material, in a direction perpendicular to the effective acceleration, does not seem to be strongly influenced by gravity. This means that shear bands can form in the presence of a weak gravitational field just as on Earth.

Item Type:Article
Additional Information:Thanks to Springer editor. The definitive version is available at : https://link.springer.com/article/10.1007%2Fs10035-013-0395-y
HAL Id:hal-01662992
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)
Other partners > Université Côte d'Azur (FRANCE)
Laboratory name:
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Deposited By: Naomi Murdoch
Deposited On:13 Dec 2017 15:04

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