Slow granular flows: The dominant role of tiny fluctuations

被引：13

作者：

van Hecke, Martin ^{[1
]}

机构：

[1] Leiden Univ, Huygens Kamerlingh Onnes Lab, NL-2300 RA Leiden, Netherlands

来源：

COMPTES RENDUS PHYSIQUE | 2015年 / 16卷 / 01期

关键词：

Slow granular flows; Rheology; Nonlocal models; Agitations; WIDE SHEAR ZONES; STRESS FLUCTUATIONS; RATE DEPENDENCE; RHEOLOGY; FRICTION;

D O I：

10.1016/j.crhy.2014.11.004

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

What mechanism governs slow flows of granular media? Microscopically, the grains experience enduring frictional contacts in these flows. However, a straightforward translation to a macroscopic frictional rheology, where the shear stresses are proportional to the normal stresses with a rate-independent friction coefficient, fails to capture important aspects of slow granular flows. There is now overwhelming evidence that agitations, tiny fluctuations of the grain positions, associated with large fluctuation of their contact forces, play a central role for slow granular flows. These agitations are generated in flowing regions, but travel deep inside the quiescent zones, and lead to a nonlocal rheology. (C) 2014 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.

引用

页码：37 / 44

页数：8

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