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Large-amplitude acoustic streaming
Journal of Fluid Mechanics, 2014AbstractA mechanism is proposed for the generation of large-amplitude acoustically-driven streaming flows in which time-mean flow speeds are comparable to the instantaneous speed of fluid particles in a high-frequency sound-wave field. Motivated by streaming observed in high-intensity discharge (HID) lamps, two-dimensional flow of a density-stratified ...
Chini, G. P. +2 more
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Acoustic streaming in a channel
The Journal of the Acoustical Society of America, 2022This paper presents an analysis of acoustic streaming in a 2D channel. The unsteady flow resulting from acoustic excitation of the enclosed fluid is of particular interest. The magnitude of the streaming velocity will depend on the Strouhal, S, and oscillatory Reynolds numbers, R.
Charles Thompson +2 more
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Acoustic streaming in the cochlea
The Journal of the Acoustical Society of America, 2022This presentation examines the fluid motion resulting from airborne and bone conduction excitation in the cochlea. The time-averaged velocity, termed acoustic streaming, driven by the gradient of the Reynolds stress, is of particular interest. The effect of asymmetry in the oval and the round window velocity and its influence pressure gradient across ...
Charles Thompson +3 more
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Acoustic streaming in closed thermoacoustic devices
The Journal of the Acoustical Society of America, 2001A derivation of acoustic streaming in a steady-state thermoacoustic device is presented in the case of zero second-order time-averaged mass flux across the resonator section (nonlooped device). This yields analytical expressions for the time-independent second-order velocity, pressure gradient, and time-averaged mass flux in a fluid supporting a ...
H, Bailliet +3 more
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Chaotic mixing generated by acoustic streaming
Ultrasonics, 2002The acoustic mixer presented in this paper is a closed cylinder containing chemical solutions. The ultrasound was generated in a water bath outside of the cylinder. The mixing efficiency was measured by using a laser-photodiode system and by mixing iodine and sodium thiosulfate.
C, Suri +4 more
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International Journal of Non-Linear Mechanics, 2008
Abstract The phenomenon of secondary motion (acoustic streaming) created by the oscillation of a fluid past a sphere is investigated through numerically solving the full Navier–Stokes equations. The main parameters that affect the structure of acoustic streaming are Reynolds number and Strouhal number.
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Abstract The phenomenon of secondary motion (acoustic streaming) created by the oscillation of a fluid past a sphere is investigated through numerically solving the full Navier–Stokes equations. The main parameters that affect the structure of acoustic streaming are Reynolds number and Strouhal number.
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Applications of Acoustic Streaming
2014In this chapter, we provide a qualitative description of acoustic streaming and review its applications in lab-on-a-chip devices. It covers boundary layer driven streaming, including Schlichting and Rayleigh streaming, Eckart streaming in the bulk fluid, cavitation microstreaming and surface-acousticwave- driven streaming.
Roy Green, Mathias Ohlin, Martin Wiklund
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Quantum mechanical representation of acoustic streaming and acoustic radiation pressure
Physical Review E, 2001We discuss acoustic streaming and acoustic radiation pressure from the viewpoint of energy and momentum of acoustic waves, using a quantum mechanical representation of acoustic waves. We represent the energy epsilon and momentum mu of acoustic waves as epsilon=n(p)homega and mu=n(p)hk; here n(p) is the phonon density, omega is the frequency, k is the ...
M, Sato, T, Fujii
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Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1954
It has been suggested by Eckart (1948), Liebermann (1949) and others that measurement of acoustic streaming in a fluid provides an independent means of evaluating the ratio of the second coefficient of viscosity to the coefficient of shear viscosity.
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It has been suggested by Eckart (1948), Liebermann (1949) and others that measurement of acoustic streaming in a fluid provides an independent means of evaluating the ratio of the second coefficient of viscosity to the coefficient of shear viscosity.
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Acoustic streaming in a rotating fluid
The Journal of the Acoustical Society of America, 1990Acoustic streaming theory is derived that is applicable to a fluid that is slow moving in a reference frame that rotates with a constant angular velocity Ω. A simplified streaming equation is obtained for the special case in which the acoustic angular frequency ω is large relative to Ω, and the change in fluid density due to rotation alone is ...
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