Suppression and emergence of granular segregation under cyclic shear
Matt Harrington1, Joost H Weijs, Wolfgang Losert
1Department of Physics and IREAP, University of Maryland, College Park, Maryland 20742, USA. mjharrin@umd.edu
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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