Size segregation in a granular bore

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
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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