EVESQUE, Pierre; PALENCIA, Fabien; LECOUTRE-CHABOT, Carole; BEYSENS, Daniel; GARRABOS, Yves

doi:10.1007/BF02945991

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EVESQUE, Pierre
Laboratoire de mécanique des sols, structures et matériaux [MSSMat]

PALENCIA, Fabien
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
ESEME : Équipe du Supercritique pour l'Environnement, les Matériaux et l'Espace : Équipe commune CEA-CNRS (2000-2014)

LECOUTRE-CHABOT, Carole
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
ESEME : Équipe du Supercritique pour l'Environnement, les Matériaux et l'Espace : Équipe commune CEA-CNRS (2000-2014)

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Microgravity Science and Technology. 2005, vol. 16, n° 1, p. 280-284

Springer

Résumé en anglais

Experiments on non interacting balls in a vibrated box are reported. In a first experiment with an electromagnetic vibrator on earth or in board of Airbus A300 of CNES, the 1-ball dynamics exhibit little transverse motion and an intermittent quasi periodic motion along the direction parallel to the vibration. This behaviour proves a significant reduction of the phase space dimension of this billiard-like system from 11-d to 3-d or 1-d. It is caused by dissipation, which generates non ergodic dynamics. This experiment exemplifies the coupling between translation and rotation degrees of freedom during the collisions with the walls, due to solid friction at contacts. This eliminates ball rotation and freezes transverse velocity fluctuations. This trends is confirmed by 3d simulations with JJ Moreau discrete element code. A two-ball experiment performed under zero-g conditions in the Maxus 5 flight confirms the trend; the quasi-periodicity is found much greater, which is probably due to an improvement of experimental conditions. The two balls are not in perfect synchronisation showing the effect of small random noise; but the particles has never collided. This is then the normal dynamics of a gas of non-interacting dilute spherical grains in a vibrated container.< Réduire

Mots clés en anglais

Granular gas

weightlessness

Spheres

Low density

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Granular gas in weightlessness: the limit case of very low densities of non interacting spheres

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