Is Dissipative Granular Gas in Knudsen Regime Excited by Vibration Biphasic ?

Details Is Dissipative Granular Gas in Knudsen Regime Excited by Vibration Biphasic ? Is Dissipative Granular Gas in Knudsen Regime Excited by Vibration Biphasic ?

2005-06-23

arxiv.org/abs/cond-mat/0506618v1

Poudres & Grains 15, 18-34, (2005), ISSN 1257-3957

Physics

Condensed Matter

Soft Condensed Matter

17 pages + 1 page, 3 Figures

Scientific paper

Compatibility between a recent model (Poudres & Grains 15, 1-17, (2005)) of vibrated granular dissipative gas and recent experimental results in micro-gravity is investigated. It is found a good agreement for the distribution of impacts, which is found to vary exponentially as P(mv) = exp-(v/vo), both experimentally and theoretically; hence it confirms the distribution f(v) of speeds varying as (1/v) exp(-v/vo). However, some discrepancy is found for the variation of the total number of impacts with the number of balls contained in the cell. This is attributed to the existence of a second phase of balls "nearly at rest". Compatibility between results from granular gas experiments in micro-gravity and experiments on Maxwell's demon in 1-g is also discussed. The main idea, which allows understanding these results is to consider the piston as playing the role of an impact generator or of a "velostat" instead of a thermostat. It is shown also that the model predicts completely different behaviours in 1g and in 0g. Pacs # : 05.45.-a, 45.50.-j, 45.70.-n, 81.70.Bt, 81.70.Ha, 83.10.Pp

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