Edwards, AN and Vriend, N. M. (2016) Size segregation in a granular bore. Physical Review Fluids, 1 (6). ISSN 2469-990X DOI https://doi.org/10.1103/PhysRevFluids.1.064201
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Abstract
We investigate the effect of particle-size segregation in an upslope propagating granular bore. A bidisperse mixture of particles, initially normally graded, flows down an inclined chute and impacts with a closed end. This impact causes the formation of a shock in flow thickness, known as a granular bore, to travel upslope, leaving behind a thick deposit. This deposit imprints the local segregated state featuring both pure and mixed regions of particles as a function of downstream position. The particle-size distribution through the depth is characterized by a thin purely small-particle layer at the base, a significant linear transition region, and a thick constant mixed-particle layer below the surface, in contrast to previously observed S-shaped steady-state concentration profiles. The experimental observations agree with recent progress that upward and downward segregation of large and small particles respectively is asymmetric. We incorporate the three-layer, experimentally observed, size-distribution profile into a depth-averaged segregation model to modify it accordingly. Numerical solutions of this model are able to match our experimental results and therefore motivate the use of a more general particle-size distribution profile.
Item Type: | Article |
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Uncontrolled Keywords: | NILAREP; |
Subjects: | 02 - Geodynamics, Geophysics and Tectonics |
Divisions: | 02 - Geodynamics, Geophysics and Tectonics 08 - Green Open Access |
Journal or Publication Title: | Physical Review Fluids |
Volume: | 1 |
Identification Number: | https://doi.org/10.1103/PhysRevFluids.1.064201 |
Depositing User: | Sarah Humbert |
Date Deposited: | 06 May 2020 17:16 |
Last Modified: | 06 May 2020 17:16 |
URI: | http://eprints.esc.cam.ac.uk/id/eprint/4726 |
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