Phase transition or Maxwell's demon in Granular gas?

Details Phase transition or Maxwell's demon in Granular gas? Phase transition or Maxwell's demon in Granular gas?

2005-06-23

arxiv.org/abs/cond-mat/0506590v1

Poudres & Grains 13, 27-39, (2002), ISSN 1257-3957

Physics

Condensed Matter

Soft Condensed Matter

13 pages + 1 page, 9 figures

Scientific paper

Dynamics of vibro-fluidised granular gas is investigated experimentally using the transfer of grains from a compartment through a horizontal slit at a given height h . It is demonstrated that the transfer rate j varies linearly with the grain number N in the box when N remains small; however j(N) becomes strongly non linear as soon as the number n of layers is larger than 0.3; dj/dN becomes negative for n>0.4.It is found also that the maximum of j(N) increases slightly with the acceleration af_ of the vibration which excites the granular gas. Using dynamical system theory, dynamics equations are written, and a critical bifurcation is found, which explains the existence of a condensation and of a phase transition. This explains how the pseudo " Maxwell's demon" works in granular gases. This experiments contradicts recent modeling . Pacs # : 5.40 ; 45.70 ; 62.20 ; 83.70.Fn

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