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Time scales in shear banding of wormlike micelles

Radulescu, O., Olmsted, P.D., Decruppe, J.P., Lerouge, S., Berret, J.F. and Porte, G. (2003) Time scales in shear banding of wormlike micelles. Europhysics Letters, 62 (2). pp. 230-236. ISSN 1286-4854

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Abstract

Transient stress and birefringence measurements are performed on wormlike micellar solutions that "shear band", i.e. undergo flow-induced coexistence of states of different viscosities along a constant stress "plateau". Three well-defined relaxation times are found after a strain rate step between two banded flow states on the stress plateau. Using the Johnson-Segalman model, we relate these time scales to three qualitatively different stages in the evolution of the bands and the interface between them: band destabilization, reconstruction of the interface, and travel of the fully formed interface. The longest timescale is then used to estimate the magnitude of the (unknown) "gradient" terms that must be added to constitutive relations to explain the history independence of the steady flow and the plateau stress selection.

Item Type: Article
Copyright, Publisher and Additional Information: © 2003 EDP Sciences. Reproduced in accordance with the publisher's self-archiving policy.
Academic Units: The University of Leeds > Faculty of Maths and Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds)
The University of Leeds > University of Leeds Research Centres and Institutes > Interdisciplinary Research Centre in Polymer Science and Technology (Leeds)
Depositing User: Repository Officer
Date Deposited: 08 Feb 2007
Last Modified: 08 Feb 2013 17:03
Published Version: http://dx.doi.org/10.1209/epl/i2003-00351-x
Status: Published
Publisher: EDP Sciences
Refereed: Yes
Identification Number: 10.1209/epl/i2003-00351-x
URI: http://eprints.whiterose.ac.uk/id/eprint/1954

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