颗粒介质表面再生区域形状研究

J4 ›› 2012, Vol. 47 ›› Issue (7): 34-38.

颗粒介质表面再生区域形状研究

余幼胜^1,2,胡林^1*

1.贵州大学理学院, 贵州贵阳 550025; 2.凯里学院物理与电子工程学院, 贵州凯里 556000

收稿日期:2012-02-20 出版日期:2012-07-20 发布日期:2012-09-01
通讯作者: 胡林(1953- ),女,教授，研究方向为软物质物理. Email:hulin53@sina.com
作者简介:余幼胜(1985- ),男,助教,硕士,研究方向为软凝聚态物理. Email:yuyoushengtt@163.com
基金资助:
贵州省省长基金项目(黔省专合字(2010)5号);贵州省社发攻关项目(黔科合OZ字［2009］2)

Study of blanket shape on the granular medium surface

YU You-sheng^1,2, HU Lin^1*

1. College of Science, Guizhou University, Guiyang 550025, Guizhou, China;
2. College of Physics and Electronic Engineering, Kaili University, Kaili 556000, Guizhou, China

Received:2012-02-20 Online:2012-07-20 Published:2012-09-01

摘要/Abstract

摘要：

大块物体从山体上滚下时,山体结构将被破坏,其前方堆起的区域称为再生区域。为了认识该自然现象的形成机制,搭建了可调角度的三维颗粒介质槽,利用图片处理技术研究了球形物体在颗粒介质表面运动形成的再生区域形状与球尺寸的关系。实验结果表明再生区域形状呈类抛物线型,并与球尺寸有关，即形状长、半宽度最大值和面积均随着小球尺寸的增大而增大。分析认为,再生区域形成过程中有两种作用机制,即球与颗粒介质作用机制和介质与介质粘滞运动机制,并且前者作用略强于后者;同时发现在粘滞作用区域中,再生区域的形成过程是一种非牛顿流体的运动。

关键词: 颗粒介质;再生区域;形状

Abstract:

When a big object rolling on the surface of the mountain, the mountain structure may be destroyed. Blanket is a region generated by uplift granules stopped in front of the object. In order to understand this natural phenomenon, an angle adjustable three-dimensional granular medium groove was constructed. The relation of blanket shape which is generated by the spherical objects with the particle′s diameter was established by means of image processing technology. Results show that the blanket shape is a quasi-parabola, and it is related to the particle′s diameter, namely the maximum long and halfwidth of blanket and area increases with both particles′ diameter. It is found that the blanket shape formation has two mechanisms of action, namely sphere and granular medium action mechanism and medium and medium viscous mechanism, and the former is little better than the latter. The blanket shape formation is non-Newtonian fluid in the viscous region.

Key words: granular medium; blanket; shape

余幼胜1,2,胡林1*. 颗粒介质表面再生区域形状研究[J]. J4, 2012, 47(7): 34-38.

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