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J4 ›› 2010, Vol. 45 ›› Issue (9): 79-82.

• 物理学 • 上一篇    下一篇

边界对颗粒介质上小球运动的影响

余幼胜,胡林*,龚程,张光华   

  1. 贵州大学理学院, 贵州 贵阳 550025
  • 收稿日期:2010-04-22 出版日期:2010-09-16 发布日期:2010-10-12
  • 通讯作者: 胡林(1953-),女,教授,博导,研究领域为软物质物理.
  • 作者简介:余幼胜(1985-),男,硕士研究生,研究方向为颗粒物质.Email:yuyoushengtt@163.com
  • 基金资助:

    贵州大学研究生创新基金项目资助项目(校研理工2010041);贵州省社发攻关项目(黔科合OZ字[2009]2)

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

YU You-sheng,  HU Lin*, GONG Cheng, ZHANG Guang-hua   

  1. College of Science, Guizhou University, Guiyang  550025, Guizhou, China
  • Received:2010-04-22 Online:2010-09-16 Published:2010-10-12

摘要:

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。

关键词: 颗粒介质;槽宽球径比;有效摩擦系数

Abstract:

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.

Key words: granular medium; flume width/sphere diameter ratio; effective friction coefficient

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