Breakdown of Energy Equipartition in Vibro-Fluidized Granular Media in Micro-Gravity
CHEN Yan-Pei1,2, Pierre Evesque2, HOU Mei-Ying1**
1Key Laboratory of Soft Matter Physics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 2Lab MSSMat, Ecole Centrale de Paris, UMR 8579 CNRS, 92295 Châtenay-Malabry Cedex, France
Breakdown of Energy Equipartition in Vibro-Fluidized Granular Media in Micro-Gravity
CHEN Yan-Pei1,2, Pierre Evesque2, HOU Mei-Ying1**
1Key Laboratory of Soft Matter Physics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 2Lab MSSMat, Ecole Centrale de Paris, UMR 8579 CNRS, 92295 Chatenay-Malabry Cedex, France
We present a micro-gravity experimental study of intermediate number density vibro-fluidized inelastic spheres in a rectangular container. Local velocity distributions are investigated, and are found to deviate measurably from a symmetric distribution for the velocity component of the vibrating direction when dividing particles along the vibration direction into several bins. This feature does not exist in the molecular gas. We further study the hydrodynamic profiles of pressures p and temperatures T in positive and negative components, such as py+ and py− and Ty+ and Ty−, in accordance with the sign of velocity components of the vibrating direction. Along vibration direction, granular media are found to be not only inhomogeneous and anisotropic, but also different greatly in positive and negative components. Energy equipartition breaks down in this case.
We present a micro-gravity experimental study of intermediate number density vibro-fluidized inelastic spheres in a rectangular container. Local velocity distributions are investigated, and are found to deviate measurably from a symmetric distribution for the velocity component of the vibrating direction when dividing particles along the vibration direction into several bins. This feature does not exist in the molecular gas. We further study the hydrodynamic profiles of pressures p and temperatures T in positive and negative components, such as py+ and py− and Ty+ and Ty−, in accordance with the sign of velocity components of the vibrating direction. Along vibration direction, granular media are found to be not only inhomogeneous and anisotropic, but also different greatly in positive and negative components. Energy equipartition breaks down in this case.
CHEN Yan-Pei, Pierre Evesque, HOU Mei-Ying. Breakdown of Energy Equipartition in Vibro-Fluidized Granular Media in Micro-Gravity[J]. 中国物理快报, 2012, 29(7): 74501-074501.
CHEN Yan-Pei, Pierre Evesque, HOU Mei-Ying. Breakdown of Energy Equipartition in Vibro-Fluidized Granular Media in Micro-Gravity. Chin. Phys. Lett., 2012, 29(7): 74501-074501.
2012, Vol. 29 
