Cyclones and attractive streaming generated by acoustical vortices

Abstract

Acoustical and optical vortices have attracted large interest due to their ability in capturing and manipulating particles with the use of the radiation pressure. Here we show that acoustical vortices can also induce axial vortical flow reminiscent of cyclones whose topology can be controlled by adjusting the properties of the acoustical beam. In confined geometry, the phase singularity enables generating attractive streaming with a flow directed toward the transducer. This opens perspectives for contact-less vortical flow control.

arXiv comment8 pages, 3 figures

References in corpus (4)

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• Acoustic resonances in microfluidic chips: full-image micro-PIV experiments and numerical simulations
• Droplets displacement and oscillations induced by ultrasonic surface acoustic waves: a quantitative study
• Low power sessile droplet actuation via modulated surface acoustic waves

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• Synthesis of anisotropic swirling surface acoustic waves by inverse filter, towards integrated generators of acoustical vortices
• Taming the degeneration of Bessel beams at anisotropic-isotropic interface: toward 3D control of confined vortical waves
• 3D trapping and dynamic axial manipulation with frequency-tuned spiraling acoustical tweezers
• Acoustic radiation torque on a particle in a fluid: an angular spectrum based compact expression
• Dynamics of sessile and pendant drop excited by surface acoustic waves: gravity effects and correlation between oscillatory and translational motions
• Three-dimensional trapping and assembly of small particles with synchronized spherical acoustical vortices
• Contactless generation and trapping of hydrodynamic knots in sessile droplets by acoustic screw dislocations