Effect of number density on velocity distributions in a driven quasi-two-dimensional granular gas

被引：3
|
作者：
Shah, Sajjad Hussain [1 ,2 ]
Li Yin-Chang [1 ]
Hou Mei-Ying [1 ,2 ]
机构：
[1] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
[2] Beijing Inst Technol, Dept Phys, Beijing 100081, Peoples R China
来源：
CHINESE PHYSICS B | 2010年 / 19卷 / 10期
基金：
中国国家自然科学基金;
关键词：
granular matter; velocity distribution; FLUCTUATIONS; LIQUIDS; MATTER; STATE;
D O I：
10.1088/1674-1056/19/10/108203
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The motion of mono-disperse spherical steel particles in a vibration driven quasi-two-dimensional (2D) square cell is studied. The cell is horizontally vibrated to eliminate the effect of gravity compaction. The velocity distributions at different particle number densities are studied and found to obey the form exp[-beta(vertical bar upsilon(y)vertical bar/sigma(y))(alpha)], in which upsilon(y) and sigma(y) are velocity and its variance in the transverse direction, and alpha and beta are fitting parameters. The value of alpha is found to decrease with the number density of particles increasing. To investigate the effect of the bottom plate, the molecular dynamics simulation without considering any bottom friction is performed. The accordance between the simulation result and the experimental result shows that the influence of bottom plate friction force on the high energy tail of the velocity distribution can be neglected.
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页数：6
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