Isolating segregation mechanisms in a split-bottom cell

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 w...

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Bibliographic Details
Published in:Physical review letters 2008-08, Vol.101 (8), p.088001-088001, Article 088001
Main Authors: Hill, K M, Fan, Yi
Format: Article
Language:English
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.101.088001