title: Isolating segregation mechanisms in a split-bottom cell.
abstract: We study the segregation of mixtures of particles in a split-bottom cell to isolate three possible driving mechanisms for segregation of densely sheared granular mixtures: gravity, porosity, and velocity gradients. We find that gravity alone does not drive segregation associated with particle size without a sufficiently large porosity or porosity gradient. A velocity gradient, however, appears to be capable of driving segregation associated with both particle size and material density. In all cases, the final segregation state is approached exponentially.
authors.affiliation: St. Anthony Falls Laboratory, Department of Civil Engineering, University of Minnesota, Minneapolis, Minnesota 55414, USA.
authors.forename: K M
authors.initials: KM
authors.lastname: Hill
authors.forename: Yi
authors.initials: Y
authors.lastname: Fan