边界对颗粒介质上小球运动的影响

为了认识物体在颗粒介质表面上运动的规律,搭建了宽度可调的颗粒介质倾斜槽,并用高速摄像机观测小球在颗粒介质上的运动行为。在不同密度小球和不同颗粒介质尺寸两种情况下分析了运动距离与槽宽球径比的关系,得出如下结论:运动距离随槽宽球径比增大而减小;槽宽球径比对小球运动距离的影响呈指数式减小;小球密度对小球运动距离的影响存在着3个区域;有效摩擦系数与颗粒槽边界存在一定关系。

Effects of boundary conditions on the moving of spheres on a granular medium

In order to recognize the motion rules of an object on granular medium, a granular medium sloping flume of adjustable width was built to observe the moving behaviors of spheres on a granular medium by high speed camera. The relations between the moving distance of the  sphere and the flume width/sphere diameter ratio were respectively studied with different density of sphere and different size of granular medium. It was  found that the moving distance decreased with the flume width/sphere diameter ratio, and the boundary effect degree decreased with the flume width/sphere diameter ratio exponentially, and the density of the  sphere affected the moving distance in three regions, and there were a certain relationship between the  effective friction coefficient and the  moving distance of the sphere.