High-frequency ultrasonic speckle velocimetry in sheared complex fluids
By S. Manneville, L. Bécu, A. Colin. 2003
137 citations recorded by the source corpus.
High-frequency ultrasonic pulses at 36 MHz are used to measure velocity profiles in a complex fluid sheared in the Couette geometry. Our technique is based on time-domain cross-correlation of ultrasonic speckle signals backscattered by the moving medium. Post-processing of acoustic data allows us to record a velocity profile in 0.02–2 s with a spatial resolution of 40 μ m over 1 mm. After a careful calibration using a Newtonian suspension, the technique is applied to a sheared lyotropic lamellar phase seeded with polystyrene spheres of diameter 3–10 μ m. Time-averaged velocity profiles reveal the existence of inhomogeneous flows, with both wall slip and shear bands, in the vicinity of a shear-induced “layering” transition. Slow transient regimes and/or temporal fluctuations can also be resolved and exhibit complex spatio-temporal flow behaviors with sometimes more than two shear bands.
Subfields: Biomedical Engineering, Fluid Flow and Transfer Processes, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/42c4e41957f4a517ee23779b1a99a886636b7760
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In Biomedical Engineering
In Fluid Flow and Transfer Processes
In Materials Chemistry
Citations in the corpus
- Recent experimental probes of shear banding (2008, background): “02–2 s depending on the shear rate with a spatial resolution of about 40 μm [127].”
- Ultrasound Imaging Velocimetry: a review (2016, methodology): “Ultrasound-based velocimetry has also been successfully applied in Taylor-Couette flows, for more fundamental rheology studies (Manneville et al. 2004).”
- Gradient and vorticity banding (2008, background): “…dynamic light scattering, and particle tracking velocimetry (Salmon et al. 2003a, e; Hu and Lips 2005; Miller and Rothstein 2007), and ultrasound (Manneville et al. 2004a, b), whereas structural changes can be inferred from birefringence/dichroism measurements (Berret et al. 1997; Hu and Lips…”
- Shear-Induced Transitions and Instabilities in Surfactant Wormlike Micelles (2009, background): “Taking into account this need of high temporal resolution to follow the dynamics of the flow field, some groups have improved their velocimetry technique [249], while others have developed new powerful probes [157, 158,248].”