Skip to Main content Skip to Navigation
New interface
Journal articles

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

Abstract : 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.
Complete list of metadata

https://hal.archives-ouvertes.fr/hal-00093813
Contributor : Stéphane Toulin Connect in order to contact the contributor
Submitted on : Wednesday, June 30, 2021 - 5:43:41 PM
Last modification on : Friday, August 5, 2022 - 11:54:22 AM
Long-term archiving on: : Friday, October 1, 2021 - 7:05:33 PM

File

2005-072-tap.pdf
Files produced by the author(s)

Identifiers

Citation

Pierre Evesque, Fabien Palencia, Carole Lecoutre-Chabot, Daniel Beysens, Yves Garrabos. Granular gas in weightlessness: the limit case of very low densities of non interacting spheres. Microgravity Science and Technology, 2005, 16 (1), pp.280-284. ⟨10.1007/BF02945991⟩. ⟨hal-00093813⟩

Share

Metrics

Record views

275

Files downloads

26