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Granular shear flow in varying gravitational environments

Murdoch, N.; Rozitis, B.; Green, S. F.; de Lophem, T. -L.; Michel, P. and Losert, W. (2013). Granular shear flow in varying gravitational environments. Granular Matter, 15(2) pp. 129–137.

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Despite their very low surface 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: Journal Item
Copyright Holders: 2013 Springer-Verlag Berlin Heidelberg
ISSN: 1434-7636
Keywords: microgravity; shear; experiment; granular; asteroid
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 36802
Depositing User: Simon Green
Date Deposited: 11 Mar 2013 09:30
Last Modified: 08 Dec 2018 06:49
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