Yield Stress and Shear Banding in Granular Suspensions

被引：103

作者：

Fall, Abdoulaye ^{[1
,2
]}

Bertrand, Francoise ^{[2
]}

Ovarlez, Guillaume ^{[2
]}

Bonn, Daniel ^{[1
,3
]}

机构：

[1] Univ Amsterdam, Van der Waals Zeeman Inst, NL-1018 XE Amsterdam, Netherlands

[2] Univ Paris Est, Lab Navier, LMSGC, F-77420 Champs Sur Marne, France

[3] Ecole Normale Super, Phys Stat Lab, F-75231 Paris 05, France

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 17期

关键词：

CONCENTRATED SUSPENSIONS; NONCOLLOIDAL PARTICLES; CONSTITUTIVE LAW; SPHERES; FLUIDS; RESUSPENSION; MECHANICS; RHEOLOGY; ONSET; FLOWS;

D O I：

10.1103/PhysRevLett.103.178301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the emergence of a yield stress in dense suspensions of non-Brownian particles by combining local velocity and concentration measurements using magnetic resonance imaging with macroscopic rheometric experiments. We show that the competition between gravity and viscous stresses is at the origin of the development of a yield stress in these systems at relatively low volume fractions. Moreover, it is accompanied by a shear-banding phenomenon that is the signature of this competition. However, if the system is carefully density matched, no yield stress is encountered until a volume fraction of 62.7 +/- 0.3%.

引用

页数：4

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