Phys. Rev. Lett. 101, 088001 (2008) [4 pages]Isolating Segregation Mechanisms in a Split-Bottom CellReceived 20 February 2008; published 21 August 2008 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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.088001
DOI:
10.1103/PhysRevLett.101.088001
PACS:
45.70.Mg, 45.70.Qj, 81.05.Rm, 05.65.+b
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