Spatiotemporal oscillations and rheochaos in a simple model of shear banding

被引：126

作者：

Fielding, SM ^{[1
]}

Olmsted, PD

机构：

[1] Univ Leeds, Polymer IRC, Leeds LS2 9JT, W Yorkshire, England

[2] Univ Leeds, Sch Phys & Astron, Leeds LS2 9JT, W Yorkshire, England

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 08期

关键词：

D O I：

10.1103/PhysRevLett.92.084502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study a simple model of shear banding in which the flow-induced phase is destabilized by coupling between flow and microstructure (wormlike micellar length). By varying the strength of instability and the applied shear rate, we find a rich variety of oscillatory and chaotic shear banded flows. At low shear and weak instability, the induced phase pulsates next to one wall of the flow cell. For stronger instability, high shear pulses ricochet across the cell. At high shear we see oscillating bands on either side of central defects. We discuss our results in the context of recent experiments.

引用

页数：4

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