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Shear-induced alignment and dynamics of elongated granular particles
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Börzsönyi, Tamás, Szabó, Balázs, Wegner, Sandra, Harth, Kirsten, Török, János, Somfai, Ellák, Bien, Tomasz and Stannarius, Ralf (2012) Shear-induced alignment and dynamics of elongated granular particles. Physical Review E, Volume 86 (Number 5). Article number 051304 . doi:10.1103/PhysRevE.86.051304 ISSN 1539-3755.
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Official URL: http://dx.doi.org/10.1103/PhysRevE.86.051304
Abstract
The alignment, ordering, and rotation of elongated granular particles was studied in shear flow. The time evolution of the orientation of a large number of particles was monitored in laboratory experiments by particle tracking using optical imaging and x-ray computed tomography. The experiments were complemented by discrete element simulations. The particles develop an orientational order. In the steady state the time- and ensemble-averaged direction of the main axis of the particles encloses a small angle with the streamlines. This shear alignment angle is independent of the applied shear rate, and it decreases with increasing grain aspect ratio. At the grain level the steady state is characterized by a net rotation of the particles, as dictated by the shear flow. The distribution of particle rotational velocities was measured both in the steady state and also during the initial transients. The average rotation speed of particles with their long axis perpendicular to the shear alignment angle is larger, while shear aligned particles rotate slower. The ratio of this fast/slow rotation increases with particle aspect ratio. During the initial transient starting from an unaligned initial condition, particles having an orientation just beyond the shear alignment angle rotate opposite to the direction dictated by the shear flow.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Research Centres > Centre for Complexity Science Faculty of Science, Engineering and Medicine > Science > Physics |
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Journal or Publication Title: | Physical Review E | ||||
Publisher: | American Physical Society | ||||
ISSN: | 1539-3755 | ||||
Official Date: | 2012 | ||||
Dates: |
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Volume: | Volume 86 | ||||
Number: | Number 5 | ||||
Page Range: | Article number 051304 | ||||
DOI: | 10.1103/PhysRevE.86.051304 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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