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Fast transient microjets induced by hemispherical cavitation bubbles

Published online by Cambridge University Press:  12 February 2015

Silvestre Roberto Gonzalez Avila ,
Chaolong Song  and
Claus-Dieter Ohl
Silvestre Roberto Gonzalez Avila*
Affiliation:
Nanyang Technological University, School of Physical and Mathematical Sciences, Division of Physics and Applied Physics, 21 Nanyang Link, Singapore 637371, Singapore Nanyang Technological University, Civil and Environmental Engineering, N11-01a-22, 50 Nanyang Avenue, Singapore 639798, Singapore
Chaolong Song
Affiliation:
Nanyang Technological University, School of Physical and Mathematical Sciences, Division of Physics and Applied Physics, 21 Nanyang Link, Singapore 637371, Singapore
Claus-Dieter Ohl
Affiliation:
Nanyang Technological University, School of Physical and Mathematical Sciences, Division of Physics and Applied Physics, 21 Nanyang Link, Singapore 637371, Singapore
*
†Email address for correspondence: [email protected]
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Abstract

We report on a novel method to generate fast transient microjets and study their characteristics. The simple device consists of two electrodes on a substrate with a hole in between. The side of the substrate with the electrodes is submerged in a liquid. Two separate microjets exit through the tapered hole after an electrical discharge is induced between the electrodes. They are formed during the expansion and collapse of a single cavitation bubble. The cavitation bubble dynamics as well as the jets were studied with high-speed photography at up to 500 000 f.p.s. With increasing jet velocity they become unstable and spray formation is observed. The jet created during expansion (first jet) is in most cases slower than the jet created during bubble collapse, which can reach up to $400~\text{m}~\text{s}^{-1}$. The spray exiting the orifice is at least in part due to the presence of cavitation in the microchannel as observed by high-speed recording. The effect of viscosity was tested using silicone oil of 10, 50 and 100 cSt. Interestingly, for all liquids the transition from a stable to an unstable jet occurs at $We\sim 4600$. We demonstrate that these microjets can penetrate into soft material; thus they can be potentially used as a needleless drug delivery device.

JFM classification

Drops and Bubbles: Bubble dynamics Drops and Bubbles: Cavitation Wakes/Jets: Jets
Type
Papers
Information
Journal of Fluid Mechanics , Volume 767 , 25 March 2015 , pp. 31 - 51
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Copyright
© 2015 Cambridge University Press 

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