title: Suppression and emergence of granular segregation under cyclic shear.
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.
authors.affiliation: Department of Physics and IREAP, University of Maryland, College Park, Maryland 20742, USA. mjharrin@umd.edu
authors.forename: Matt
authors.initials: M
authors.lastname: Harrington
authors.forename: Joost H
authors.initials: JH
authors.lastname: Weijs
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Losert