Vertically shaken column of spheres. Onset of fluidization

2002/03/19 by Simon Renard, Thomas Schwager, Thorsten Poeschel +1
Physics and Astronomy · #cond-mat.mtrl-sci

paper · pdf

published as Europ. Phys. J. C, Vol. 4, 233 (2001) · 7 pages, 11 figures

arxiv created 2002/03/19 · arxiv updated 2009/11/30

Abstract

The onset of surface fluidization of granular material in a vertically vibrated container, z=A cos(ωt), is studied experimentally. Recently, for a column of spheres it has been theoretically found that the particles lose contact if a certain condition for the acceleration amplitude z ≡ Aω²/g = f(ω) holds. This result is in disagreement with other findings where the criterion z=z_crit=const. was found to be the criterion of fluidization. We show that for a column of spheres a critical acceleration is not a proper criterion for fluidization and compare the results with theory.

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