摘要
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 p+y and p-y and T+y and T-y,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.
作者
陈延佩
Pierre Evesque
厚美瑛
CHEN Yan-Pei;Pierre Evesque;HOU Mei-Ying(Key Laboratory of Soft Matter Physics,Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190;Lab MSSMat,Ecole Centrale de Paris,UMR 8579 CNRS,92295 Châtenay-Malabry Cedex,France)
基金
Supported by the Knowledge Innovation Project of the Chinese Academy of Sciences under Grant No KJCX2-YW-L08
the National Natural Science Foundation of China under Grant No 10720101074 and 11034010
the Special Fund for Earthquake Research of China under Grant No 201208011,and CNRS,CNES Special Funds.