中国物理B ›› 2016, Vol. 25 ›› Issue (8): 84501-084501.doi: 10.1088/1674-1056/25/8/084501
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
Yifeng Mei(梅一枫), Yanpei Chen(陈延佩), Wei Wang(王维), Meiying Hou(厚美瑛)
Yifeng Mei(梅一枫)1, Yanpei Chen(陈延佩)1, Wei Wang(王维)1, Meiying Hou(厚美瑛)2
摘要:
The free path of a vibro-fluidized two-dimensional (2D) inelastic granular gas confined in a rectangular box is investigated by 2D event-driven molecular simulation. By tracking particles in the simulation, we analyze the local free path. The probability distribution of the free path shows a high tail deviating from the exponential prediction. The anisotropy of the free path is found when we separate the free path to x and y components. The probability distribution of y component is exponential, while x component has a high tail. The probability distribution of angle between the relative velocity and the unit vector joined two particle centers deviates from the distribution of two random vectors, indicating the existence of the dynamic heterogeneities in our system. We explain these results by resorting to the kinetic theory with two-peak velocity distribution. The kinetic theory agrees well with the simulation result.
中图分类号: (Granular systems)