Shear-banding in surfactant wormlike micelles: elastic instabilities and wall slip
| Autor: | Sandra Lerouge, I. Buchet-Maulien, Julien Browaeys, Sébastien Manneville, Marie-Alice Guedeau-Boudeville, Thibaut Divoux, Marc-Antoine Fardin, Gareth H. McKinley |
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| Přispěvatelé: | Multiscale Material Science for Energy and Environment (MSE 2), Massachusetts Institute of Technology (MIT), Matière et Systèmes Complexes (MSC), Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Laboratoire de Physique de l'ENS Lyon (Phys-ENS), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Matière et Systèmes Complexes (MSC (UMR_7057)), Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), École normale supérieure - Lyon (ENS Lyon)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7) |
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Turbulence
Chemistry Analytical chemistry Laminar flow General Chemistry Velocimetry Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas [PHYS.PHYS.PHYS-ED-PH]Physics [physics]/Physics [physics]/Physics Education [physics.ed-ph] Condensed Matter::Soft Condensed Matter Physics::Fluid Dynamics Shear rate Complex dynamics Shear (geology) Rheology Chemical physics 0103 physical sciences Lubrication 010306 general physics [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft] ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Soft Matter Soft Matter, 2012, 8 (8), pp.2535. ⟨10.1039/C2SM06992J⟩ Soft Matter, Royal Society of Chemistry, 2012, 8 (8), pp.2535. ⟨10.1039/C2SM06992J⟩ |
| ISSN: | 1744-683X 1744-6848 |
| DOI: | 10.1039/c2sm06992j |
| Popis: | We report on the flow dynamics of a wormlike micellar system (CPCl/NaSal/brine) undergoing a shear-banding transition using a combination of global rheology, 1D ultrasonic velocimetry and 2D optical visualisation. The different measurements being performed in a single Taylor–Couette geometry, we find a strong correlation between the induced turbid band observed optically and the high shear rate band. This correspondence reveals that fluctuations observed in the 1D velocity profiles are related to elastic instabilities triggered in the high shear rate band: 3D coherent (laminar) flow and 3D turbulent flow successively develop as the applied shear rate is increased. The specific characteristics of the resulting complex dynamics are found to depend on subtle changes in the sample, due to temporary light exposure. The CPCl molecules exhibit a photochemistry mainly influenced by the photo-induced cleavage of the pyridine ring that yields an unstable aldehyde enamine, which further decays by thermally activated processes. The products of the reaction possibly build up a lubrication layer responsible for pathological flow dynamics. Overall, our results bridge the gap between previous independent optical and local velocity measurements and explain most of the observed fluctuations in terms of a sequence of elastic instabilities which turns out to be widespread among semidilute wormlike micellar systems. |
| Databáze: | OpenAIRE |
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