通道宽度对二维粗糙边界斜面颗粒流的影响

在此之前已经报道了二维斜面颗粒流在通道中的分布规律以及二维斜面粗糙边界附近的颗粒 流量密度（ξ=ρ·ν）分布.本文则主要研究通道宽度W对边界附近颗粒流量密度(ξ=ρ· ν)分布的影响.结果表明，颗粒流量密度随通道宽度的变化（ξ W）存在一临界通道宽度W c.在本实验条件下临界通道宽度Wc=70d.当通道宽度小于临界宽度Wc时 ，通道中距边界20d—30d区间内的相对颗粒流量密度随斜面倾斜角的变化可描述为ξ∝( sinθ)α，α是与通道宽度W有关的参数，其数值在032至085之间.关键词：二维颗粒流颗粒物质颗粒流量密度

The effect of channel width on the distribution of two-dimensional granular flow in an inclined channel

We have investigated the distribution of two_dimensional granular flow in inclin ed channel and the distribution of the density of granular flux (ξ=ρ·ν) near the rough boundary walls. The results showed that the transverse distributi on of the density of granular flux is symmetric about the channel center, and th ere exists a strong extremum near the wall; the distribution of the density of g ranular flux near the walls is nonlinear with increasing inclination. In this paper, we turn attention to the effect of channel width on the distribution of the density of granular flux. There is a critical channel width for the distribu tion of the density of granular flux. In our experimental condition, the critica l width is 700mm (Wc=70d,d being the granular diameter), and there i s a weak extremum in the curve of the density of granular flux distribution when the channel width is in the range from 70 to 80d. When the channel width is smaller than the critical width, the density of granular flux can be expressed by ξ∝(sinθ)α with,032≤α≤085 the value of α is related with the channel width.