Inertio-elastic instability of non shear-banding wormlike micelles

Homogeneous polymer solutions are well known to exhibit viscoelastic flow instabilities: purely elastic when inertia is negligible and inertio-elastic otherwise. Recently, shear-banding wormlike micelle solutions were also discovered to follow a similar phenomenology. In the shear-banding regime, in...

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Published inSoft matter Vol. 10; no. 10; pp. 1450 - 1454
Main Authors Perge, Christophe, Fardin, Marc-Antoine, Manneville, Sébastien
Format Journal Article
LanguageEnglish
Published England 14.03.2014
Subjects
Fluid dynamics
Fluid flow
Inertia
Instability
Micelles
Phenomenology
Stability
Vortices
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Summary:Homogeneous polymer solutions are well known to exhibit viscoelastic flow instabilities: purely elastic when inertia is negligible and inertio-elastic otherwise. Recently, shear-banding wormlike micelle solutions were also discovered to follow a similar phenomenology. In the shear-banding regime, inertia is usually negligible so only purely elastic flows have been reported. Here, we investigate a non-shear-banding solution where inertia becomes significant, leading to flow patterns akin to the inertio-elastic regime of dilute polymer solutions. We show that the instability follows a supercritical bifurcation and we investigate the structure of the inertio-elastic vortices that develop above the onset.
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ISSN:1744-683X
1744-6848
DOI:10.1039/c3sm52868e