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Criterion for purely elastic Taylor-Couette instability in the flows of shear-banding fluids

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 spatio-temporal fluctuations. Recently, it has been suggested that those fluctuations originate from a purely elastic instability of the flow. In cylindrical Couette geometry, the instability is reminiscent of the Taylor-like instability observed in viscoelastic polymer solutions. In this letter, we describe how the criterion for purely elastic Taylor-Couette instability should be adapted to shear-banding flows. We derive three categories of shear-banding flows with curved streamlines, depending on their stability.
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https://hal.archives-ouvertes.fr/hal-01053556
Contributor : Guillaume Grégoire Connect in order to contact the contributor
Submitted on : Thursday, July 31, 2014 - 12:28:42 PM
Last modification on : Saturday, June 25, 2022 - 8:54:38 PM

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Marc-Antoine Fardin, T. J. Ober, Cyprien Gay, Guillaume Grégoire, Gareth Mckinley, et al.. Criterion for purely elastic Taylor-Couette instability in the flows of shear-banding fluids. EPL - Europhysics Letters, 2011, 96, pp.4404. ⟨10.1209/0295-5075/96/44004⟩. ⟨hal-01053556⟩

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