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

Autor:	Fardin, M. A., Ober, T. J., Gay, C., Grégoire, G., McKinley, G. H., Lerouge, S.
Rok vydání:	2011
Předmět:	Condensed Matter - Soft Condensed Matter Physics - Fluid Dynamics
Druh dokumentu:	Working Paper
DOI:	10.1209/0295-5075/96/44004
Popis:	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. Comment: 6 pages, 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1108.2731 Zobrazit plný text záznamu View this record from Arxiv