Fluctuating velocity and momentum transfer in dense granular flows

G. Gioia, S. E. Ott-Monsivais, Kimberly M Hill

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

We show experimentally that in a free-surface granular flow the fluctuating velocity brings about momentum transfer at a considerable rate only very close to the free surface. Away from the free surface, where the flow is dense and stratified (or laminar), the fluctuating velocity plays no prominent dynamic role and stems passively from a kinematic constraint: The strata of particles must shake laterally as they slip past one another in the direction of the mean flow. Based on this insight, we formulate a simple model for the fluctuating velocity of dense granular flows. The predictions of the model agree well with our experimental measurements.

Original languageEnglish (US)
Article number138001
JournalPhysical Review Letters
Volume96
Issue number13
DOIs
StatePublished - Apr 14 2006

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