Shear Thickening in Non-Brownian Suspensions: An Excluded Volume Effect

被引：77

作者：

Picano, Francesco ^{[1
,2
]}

Breugem, Wim-Paul ^{[3
]}

Mitra, Dhrubaditya ^{[4
,5
]}

Brandt, Luca ^{[1
,2
]}

机构：

[1] KTH Mech, Linne FLOW Ctr, SE-10044 Stockholm, Sweden

[2] KTH Mech, SeRC, SE-10044 Stockholm, Sweden

[3] Delft Univ Technol, Lab Aero & Hydrodynam, NL-2628 CA Delft, Netherlands

[4] Royal Inst Technol, NORDITA, SE-10691 Stockholm, Sweden

[5] Stockholm Univ, SE-10691 Stockholm, Sweden

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 09期

基金：

瑞典研究理事会;

关键词：

CONCENTRATED SUSPENSIONS; FLOW; MICROSTRUCTURE; DISPERSIONS; RHEOLOGY;

D O I：

10.1103/PhysRevLett.111.098302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Shear thickening appears as an increase of the viscosity of a dense suspension with the shear rate, sometimes sudden and violent at high volume fraction. Its origin for noncolloidal suspension with non-negligible inertial effects is still debated. Here we consider a simple shear flow and demonstrate that fluid inertia causes a strong microstructure anisotropy that results in the formation of a shadow region with no relative flux of particles. We show that shear thickening at finite inertia can be explained as an increase of the effective volume fraction when considering the dynamically excluded volume due to these shadow regions.

引用

页数：5

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