Vibration-induced granular segregation: a phenomenon driven by three mechanisms

Details Vibration-induced granular segregation: a phenomenon driven by three mechanisms Vibration-induced granular segregation: a phenomenon driven by three mechanisms

2004-02-09

arxiv.org/abs/cond-mat/0402256v1

Physics

Condensed Matter

Statistical Mechanics

4 pages. 3 figures, revtex4, to appear in PRL (in press)

Scientific paper

10.1103/PhysRevLett.92.114301

The segregation of large spheres in a granular bed under vertical vibrations is studied. In our experiments we systematically measure rise times as a function of density, diameter and depth; for two different sinusoidal excitations. The measurements reveal that: at low frequencies, inertia and convection are the only mechanisms behind segregation. Inertia (convection) dominates when the relative density is greater (less) than one. At high frequencies, where convection is suppressed, fluidization of the granular bed causes either buoyancy or sinkage and segregation occurs.

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