Directed jetting from collapsing cavities exposed to focused ultrasound

B. Gerold; P. Glynne-Jones; C. McDougall; D. McGloin; S. Cochran; A. Melzer; P. Prentice

doi:10.1063/1.3676414

Directed jetting from collapsing cavities exposed to focused ultrasound

B. Gerold^*, P. Glynne-Jones, C. McDougall, D. McGloin, S. Cochran, A. Melzer, P. Prentice

^*Corresponding author for this work

Physics

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

We demonstrate directed jetting from pulsed laser-induced cavities subjected to a burst of focused ultrasound. Alignment of the ultrasound focus and the pressure amplitudes in the vicinity of the cavity dictate the direction and length of the resulting jet, respectively. We interpret our observations in terms of radiation forces exerted on the cavity, due to the pressure gradient introduced to the ultrasound focus by its presence. We support our hypothesis with a linear analysis of the force distribution across the cavity surface, at the moment of maximum inflation, which shows reasonable predictive agreement with the observed jet characteristics.

Original language	English
Article number	024104
Journal	Applied Physics Letters
Volume	100
Issue number	2
DOIs	https://doi.org/10.1063/1.3676414
Publication status	Published - 9 Jan 2012

Bibliographical note

Funding Information:
We are grateful to Prof John Blake and his group for continuing and constructive discussions regarding our observations. The authors acknowledge the EPSRC loan pool, particularly A. Walker, for the loan of the high speed camera. This work was supported by EU FP7 IAPP Grant No. 230674 (Nanoporation Project) and a UK EPSRC grant, “Sonotweezers.” B.G. is also supported by a UK EPSRC DTA award. D.M. thanks the Royal Society for support. P.P. acknowledges the Norwegian Research Council for an Yggdrasil mobility award.

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AU - Cochran, S.

AU - Melzer, A.

AU - Prentice, P.

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AB - We demonstrate directed jetting from pulsed laser-induced cavities subjected to a burst of focused ultrasound. Alignment of the ultrasound focus and the pressure amplitudes in the vicinity of the cavity dictate the direction and length of the resulting jet, respectively. We interpret our observations in terms of radiation forces exerted on the cavity, due to the pressure gradient introduced to the ultrasound focus by its presence. We support our hypothesis with a linear analysis of the force distribution across the cavity surface, at the moment of maximum inflation, which shows reasonable predictive agreement with the observed jet characteristics.

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Directed jetting from collapsing cavities exposed to focused ultrasound

Abstract

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