边界形状对二维斜面颗粒流的影响

Effect of the shape of boundary wall on the distribution of two-dimensional granular flow in an inclined channel.

用实验方法研究了不同边界形状下二维斜面颗粒流在通道中的分布.结果表明,边界形状对二维斜面颗粒流有重要影响,粗糙边界条件下,颗粒流量密度在通道中横向呈对称马鞍型分布,且峰值位置与边界形状有关.对锯齿形边界,颗粒流量密度的峰值位置随斜面倾角（sinθ）的增大往中心区域移动,墙体附近20～30 d（d为颗粒直径）区域内颗粒流量密度随斜面倾角的变化呈指数衰减,衰减指数在2～3之间;对于半圆形边界,峰值位置始终出现在墙体附近20～30 d区域内,并且此区域内的颗粒流量密度随斜面倾角（sinθ）基本呈线性变化.

The distribution of two-dimensional granular flow in an inclined channel with different shape of boundarY walls was investigated. The results showed that the shape of boundary walls is important to the distribution of twodimensional granular flow. When the boundary wails are rough, the density of granular flux near the boundary wall is higher than the center of the channel with its peak locality related to the shape of boundary walls. As for the zigzag wall, the peak moves to the channel center and the density of the granular flux near the wall is decaying expo nentially with increasing inclination of the channel （sinθ）, the exponential is between 2 and 3. But as for the hemi cycle boundary walls, the peak would not move and the density of granular flux near the boundary wall is linear with increasing inclination of the channel （sinθ）.