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Unveiling of the mechanisms of acoustic streaming induced by sharp edges

Abstract : Acoustic waves can generate steady streaming within a fluid owing to the generation of viscous boundary layers near walls of typical thickness δ. In microchannels, the acoustic wavelength λ is adjusted to twice the channel width w to ensure a resonance condition, which implies the use of MHz transducers. Recently, though, intense acoustic streaming was generated by acoustic waves of a few kHz (hence with λ w), owing to the presence of sharp-tipped structures of curvature radius at the tip r c smaller than δ. The present study quantitatively investigates this sharp-edge acoustic streaming via the direct resolution of the full Navier-Stokes equation using the finite element method. The influence of δ, r c , and viscosity ν on the acoustic streaming performance is quantified. Our results suggest choices of operating conditions and geometrical parameters, in particular the dimensionless tip radius of curvature r c /δ and the liquid viscosity.
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https://hal.archives-ouvertes.fr/hal-03051910
Contributor : Philippe Brunet <>
Submitted on : Thursday, December 10, 2020 - 1:29:20 PM
Last modification on : Wednesday, June 2, 2021 - 4:27:37 PM
Long-term archiving on: : Thursday, March 11, 2021 - 7:32:34 PM

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Chuanyu Zhang, Xiaofeng Guo, Laurent Royon, Philippe Brunet. Unveiling of the mechanisms of acoustic streaming induced by sharp edges. Physical Review E , American Physical Society (APS), 2020, 102 (4), ⟨10.1103/physreve.102.043110⟩. ⟨hal-03051910⟩

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