Is there a critical acceleration for the onset of convection?

Details Is there a critical acceleration for the onset of convection? Is there a critical acceleration for the onset of convection?

2002-04-02

arxiv.org/abs/cond-mat/0204058v1

In: H.J.Herrmann, J.-P. Hovi, and S.Luding (eds): ``Physics of Dry Granular Materials'', Kluwer (Dortrecht, 1998), p.625

Physics

Condensed Matter

Materials Science

7 pages, 1 figure

Scientific paper

Suppose granular material is shaken vertically with z(t)=A_0 cos(\omega_0 t).
Can we expect to find convection if A_0\omega_0^2 < g? By means of theoretical
analysis and computer simulation we find that there is no critical
\Gamma=|A_0|\omega_0^2/g for the onset of convection. Instead we propose a
modified criterion which coincides with \Gamma=1 for small frequency \omega_0.

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