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Synthetic jet generation by high-frequency cavitation

Published online by Cambridge University Press:  21 June 2017

Milad Mohammadzadeh Open the ORCID record for Milad Mohammadzadeh [Opens in a new window] ,
Silvestre Roberto Gonzalez-Avila ,
Kun Liu ,
Qi Jie Wang  and
Claus-Dieter Ohl
Milad Mohammadzadeh
Affiliation:
School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore, Singapore
Silvestre Roberto Gonzalez-Avila
Affiliation:
School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore, Singapore
Kun Liu
Affiliation:
School of Electrical and Electronic Engineering, Nanyang Technological University, 639798 Singapore, Singapore
Qi Jie Wang
Affiliation:
School of Electrical and Electronic Engineering, Nanyang Technological University, 639798 Singapore, Singapore
Claus-Dieter Ohl*
Affiliation:
School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore, Singapore
*
†Email address for correspondence: cdohl@ntu.edu.sg
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Abstract

Cavitation bubbles are nucleated at a high repetition rate in water by delivering a pulsed laser through a fibre optic. Continuous high-frequency cavitation drives a stream away from the fibre tip. Using high-speed photography and particle image velocimetry, the stream is characterised as a synthetic jet, generated by trains of vortices induced by non-spherical bubble collapse. At low laser power, the bubbles collapse before the arrival of a subsequent laser pulse. Yet, by increasing the laser power, a system of bubbles is formed which leads to complex bubble–bubble interactions. The synthetic jet is observed regardless of the bubble formation regime, demonstrating the stability of the phenomenon. Synthetic jet generation by repetitive bubble collapse extends the well-studied acoustic streaming from small-amplitude bubble oscillations.

JFM classification

Drops and Bubbles: Bubble dynamics Drops and Bubbles: Cavitation Wakes/Jets: Jets
Type
Rapids
Information
Journal of Fluid Mechanics , Volume 823 , 25 July 2017 , R3
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Copyright
© 2017 Cambridge University Press 

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Mohammadzadeh et al. supplementary movie

Motion of fluorescent microparticles due to high-frequency cavitation on a fibre optic tip. A complex flow field is observed near the tip, with particles going back and forth as bubbles form and collapse. The particles are radially attracted toward the fibre axis, driving a jet that is directed away from the cavitation site. The laser is running at 40 kHz and 20 W.

Download Mohammadzadeh et al. supplementary movie(Video)
Video 4.4 MB

Mohammadzadeh et al. supplementary movie

Bubble formation at the tip of a fibre optic that delivers a pulsed laser at a repetition rate of f=40kHz into water. From top to bottom, the average laser power P=2.5, 5, 10, and 15W. At low laser power, the bubble collapses before the next laser pulse. However, by increasing the laser power, the bubble grows large enough such that it has not collapsed when the next laser pulse arrives. This leads to formation of a secondary bubble at the tip of the initial bubble, which moves away from the fibre tip as it collapses.

Download Mohammadzadeh et al. supplementary movie(Video)
Video 4.2 MB