Kudrolli A, Henry J
Department of Physics, Clark University, Worcester, Massachusetts 01610, USA.
Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics. 2000 Aug;62(2 Pt A):R1489-92. doi: 10.1103/physreve.62.r1489.
The velocity distribution of spheres rolling on a slightly tilted rectangular two-dimensional surface is obtained by high speed imaging. The particles are excited by periodic forcing of one of the side walls. Our data suggests that strongly non-Gaussian velocity distributions can occur in dilute granular materials even in the absence of significant density correlations or clustering. When the surface on which the particles roll is tilted further to introduce stronger gravitation, the collision frequency with the driving wall increases and the velocity component distributions approach Gaussian distributions of different widths.
通过高速成像获得了在轻微倾斜的矩形二维表面上滚动的球体的速度分布。颗粒由其中一个侧壁的周期性强迫激发。我们的数据表明，即使在没有显著密度关联或团聚的情况下，稀颗粒材料中也可能出现强烈的非高斯速度分布。当颗粒滚动的表面进一步倾斜以引入更强的引力时，与驱动壁的碰撞频率增加，速度分量分布接近不同宽度的高斯分布。
