Discontinuous decompaction of a falling sandpile

被引：25

作者：

Duran, J ^{[1
]}

Mazozi, T ^{[1
]}

Luding, S ^{[1
]}

Clement, E ^{[1
]}

Rajchenbach, J ^{[1
]}

机构：

[1] THEORET POLYMERPHYS,D-79104 FREIBURG,GERMANY

来源：

PHYSICAL REVIEW E | 1996年 / 53卷 / 02期

关键词：

D O I：

10.1103/PhysRevE.53.1923

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

We investigate experimentally and via computer simulations the frail of a two dimensional granular material in a rectangular container with friction only at the lateral walls. We study the decompaction modes of the granular assembly, which is a basic question relevant to the general dynamics of a noncohesive powder. We observe during the fall the possible occurrence of successive cracks splitting the initial pile into smaller blocks as time passes. These cracks preferentially occur in the lower part of the array, resulting in an ascending decompaction wave in the bulk. We show experimentally how this effect is related to the surface roughness of the boundaries. A heuristic continuum theory is proposed that rationalizes the experimental results. Furthermore, event driven simulations, including particle rotations and friction, parallel nicely the experimental observations. In the simulations, we find strong pressure fluctuations at the boundaries correlated to the occurrence of arches.

引用

页码：1923 / 1930

页数：8