Issue |
Europhys. Lett.
Volume 40, Number 2, October II 1997
|
|
---|---|---|
Page(s) | 159 - 164 | |
Section | Condensed matter: structure, thermal and mechanical properties | |
DOI | https://doi.org/10.1209/epl/i1997-00439-9 | |
Published online | 01 September 2002 |
Experimental study on the mechanism of convection modes in vibrated granular beds
Department of Chemical Engineering and Materials Science,
Shizuoka University, 3-5-1 Johoku, Hamamatsu 432, Japan
Received:
23
December
1996
Accepted:
11
September
1997
This paper describes a mechanism of the newly found convection mode of
vibrated granular beds which gives rise to multi-pairs of convection
rolls.
In beds of glass beads with mean diameters
mm, neither the ambient air pressure nor vessel materials
significantly affect the critical vibrational acceleration
above which the convection mode changes.
Measurements of air pressure within vibrating granular beds
at two locations, near the side wall and in the middle of the bed,
show different period-doubling bifurcations.
There are differences in the phase and the magnitude of pressures
between the two measured points.
On the basis of these experimental findings we propose mechanisms for
two convection modes in vibrated granular beds.
PACS: 64.60.Ht – Dynamic critical phenomena / 46.10.+z – Mechanics of discrete systems
© EDP Sciences, 1997
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