Suppression and Emergence of Granular Segregation under Cyclic Shear

Matt Harrington, Joost H. Weijs, and Wolfgang Losert
Phys. Rev. Lett. 111, 078001 – Published 16 August 2013

Abstract

While convective flows are implicated in many granular segregation processes, the associated particle-scale rearrangements are not well understood. A three-dimensional bidisperse mixture segregates under steady shear, but the cyclically driven system either remains mixed or segregates slowly. Individual grain motion shows no signs of particle-scale segregation dynamics that precede bulk segregation. Instead, we find that the transition from nonsegregating to segregating flow is accompanied by significantly less reversible particle trajectories and the emergence of a convective flow field.

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  • Received 15 February 2013

DOI:https://doi.org/10.1103/PhysRevLett.111.078001

© 2013 American Physical Society

Authors & Affiliations

Matt Harrington1,*, Joost H. Weijs2, and Wolfgang Losert1,†

  • 1Department of Physics and IREAP, University of Maryland, College Park, Maryland 20742, USA
  • 2Physics of Fluids Group and J.M. Burgers Centre for Fluid Dynamics, University of Twente, Post Office Box 217, 7500 AE Enschede, The Netherlands

  • *mjharrin@umd.edu
  • wlosert@umd.edu

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Vol. 111, Iss. 7 — 16 August 2013

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