Ultrasound velocimetry in a shear-thickening wormlike micellar solution: evidence for the coexistence of radial and vorticity shear bands.

The European Physical Journal. E, Soft Matter
Vishweshwara HerlePeter Fischer

Abstract

We carried out pointwise local velocity measurements on 40 mM cetylpyridinium chloride-sodium salicylate (CPyCl-NaSal) wormlike micellar solution using high-frequency ultrasound velocimetry in a Couette shear cell. The studied wormlike solution exhibits Newtonian, shear-thinning and shear-thickening rheological behavior in a stress-controlled environment. Previous rheology, flow visualization and small-angle light/neutron scattering experiments in the shear-thickening regime of this system showed the presence of stress-driven alternating transparent and turbid rings or vorticity bands along the axis of the Couette geometry. Through local velocity measurements we observe a homogeneous flow inside the 1mm gap of the Couette cell in the shear-thinning (stress-plateau) region. Only when the solution is sheared beyond the critical shear stress (shear-thickening regime) in a stress-controlled experiment, we observe inhomogeneous flow characterized by radial or velocity gradient shear bands with a highly sheared band near the rotor and a weakly sheared band near the stator of the Couette geometry. Furthermore, fast measurements performed in the shear-thickening regime to capture the temporal evolution of local velocities indicate coex...Continue Reading

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Citations

Apr 24, 2014·The European Physical Journal. E, Soft Matter·Christophe PergeSébastien Manneville
Feb 17, 2015·Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology·Sara MovassaghianVladimir P Torchilin
Oct 10, 2014·Soft Matter·Marc-Antoine Fardin, Sandra Lerouge
May 10, 2019·Scientific Reports·Steffen M RecktenwaldNorbert Willenbacher

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