Fluctuations of a piston on top of a fluidized granular gas

Brey Abalo, José Javier; Ruiz Montero, María José

doi:10.1063/1.3082270

Fluctuations of a piston on top of a fluidized granular gas

Brey Abalo, José Javier; Ruiz Montero, María José

Published: 2009
Publisher: American Institute of Physics
DOI: 10.1063/1.3082270
Repository: idus.us.es
Language: en

Abstract

A fluidized granular gas in presence of a gravitational field is considered. It is enclosed in a box with a movable piston on the top. Molecular dynamics simulation results show that, if the box is not too wide, the system reaches a stationary state with gradients only in the direction of the field. Here, attention is focussed on the velocity fluctuations of the piston, that are observed to be Gaussian. The relationship between the second moment of this distribution and the granular temperature of the gas just below it is investigated. The ratio between the mean square velocities of the pisto and the gas can be larger or smaller than unity depending on the parameters of the system. A kinetic theory is formulated and its predictions compared with the simulation data.

Full text

AIP Conference Proceedings 1091, 109 (2009); https://doi.org/10.1063/1.3082270 1091, 109 © 2009 American Institute of Physics. Fluctuations of a piston on top of a fluidized granular gas Cite as: AIP Conference Proceedings 1091, 109 (2009); https:// doi.org/10.1063/1.3082270 Published Online: 30 January 2009 J. Javier Brey, and M. J. Ruiz Montero