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Interplay between elastic instabilities and shear-banding: three categories of Taylor–Couette flows and beyond

Content Provider	Royal Society of Chemistry (RSC)
Author	Manneville, S. Grenard, V. Lerouge, S. Divoux, T. McKinley, G. H. Fardin, M. A. Ober, T. J.
Copyright Year	2012
Abstract	In the past twenty years, shear-banding flows have been probed by various techniques, such as rheometry, velocimetry and flow birefringence. In micellar solutions, many of the data collected exhibit unexplained spatiotemporal fluctuations. Recently, it has been suggested that those fluctuations originate from a purely elastic instability of the shear-banding flow. In cylindrical Couette geometry, the instability is reminiscent of the Taylor-like instability observed in viscoelastic polymer solutions. The criterion for purely elastic Taylor–Couette instability adapted to shear-banding flows suggested three categories of shear-banding depending on their stability. In the present study, we report on a large set of experimental data which demonstrates the existence of the three categories of shear-banding flows in various surfactant solutions. Consistent with theoretical predictions, increases in the surfactant concentration or in the curvature of the geometry destabilize the flow, whereas an increase in temperature stabilizes the flow. However, experiments also exhibit some interesting behaviors going beyond the purely elastic instability criterion.
Starting Page	10072
Ending Page	10089
Page Count	18
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	8
Issue Number	39
Journal	Soft Matter
DOI	10.1039/c2sm26313k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Viscoelasticity Taylor Flow birefringence Micellar solutions Polymer Surfactant Molecular geometry
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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