paper

Flow of wet granular materials

arXiv:cond-mat/0412337 · doi:10.1103/PhysRevLett.94.028301

Abstract

The transition from frictional to lubricated flow of a dense suspension of non-Brownian particles is studied. The pertinent parameter characterizing this transition is the Leighton number , which represents the ratio of lubrication to frictional forces. The Leighton number defines a critical shear rate below which no steady flow without localization exists. In the frictional regime the shear flow is localized. The lubricated regime is not simply viscous: the ratio of shear to normal stresses remains constant, as in the frictional regime; moreover the velocity profile has a single universal form in both frictional and lubricated regimes. Finally, a discrepancy between local and global measurements of viscosity is identified, which suggests inhomogeneity of the material under flow.

Accepted for publication by Physical Review Letters (december 2004)

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