Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
1998-03-10
Physics
Condensed Matter
Soft Condensed Matter
8 pages with postscript figures, RevTex, to appear in Phys. Rev. E
Scientific paper
10.1103/PhysRevE.57.4528
The surface shape of a spinning bucket of granular material is studied using a continuum model of surface flow developed by Bouchaud et al. and Mehta et al. An experimentally observed central subcritical region is reproduced by the model. The subcritical region occurs when a metastable surface becomes unstable via a nonlinear instability mechanism. The nonlinear instability mechanism destabilizes the surface in large systems while a linear instability mechanism is relevant for smaller systems. The range of angles in which the granular surface is metastable vanishes with increasing system size.
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