Issue
EPL
Volume 80, Number 1, October 2007
Article Number 14007
Number of page(s) 5
Section Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics
DOI http://dx.doi.org/10.1209/0295-5075/80/14007
Published online 12 September 2007
EPL, 80 (2007) 14007
DOI: 10.1209/0295-5075/80/14007

Evaporation transition in vibro-fluidized granular matter

J. E. Fiscina1 and M. O. Cáceres2, 3

1  Experimental Physics, Saarland University - D-66123, Saarbücken, Germany
2  Centro Atómico Bariloche, Instituto Balseiro, CONICET - 8400, Bariloche, Argentina
3  The Abdus Salam ICTP - 34014 Trieste, Italy


received 10 May 2007; accepted in final form 17 August 2007; published October 2007
published online 12 September 2007

Abstract
Using laser facility, we investigate the speed distribution in the gas phase of a vibrated 3D granular matter bed. Invoking a volume-exclusion principle in a dissipative theory we present a kinetic model to explain the non-Maxwellian distribution, the mean free path and its associated granular-matter global temperature. We reveal that the fluidized gap is a lattice-gas with a constant packing factor.

PACS
45.70.-n - Granular systems.
05.40.-a - Fluctuation phenomena, random processes, noise, and Brownian motion.
05.70.Ln - Nonequilibrium and irreversible thermodynamics.

© Europhysics Letters Association 2007