Texture of granular surface flows: experimental investigation and biphasic non-local model
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We investigate here the rheology of dense granular surface flow. First, steady surface flows in a rotating drum are studied experimentally and a large number of clusters of `jammed' grains embedded in the flowing layer is evidenced. The clusters size is power-law distributed, from the grain size scale up to the thickness of the flowing layer. Theoretical implications are then discussed and a non-local biphasic rheological law is proposed. The resulting model succeeds quantitatively to account for the unusual shape of the velocity profile within granular surface flows as well as for the different scalings observed in rotating drum experiments.
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