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Title: Fast transient microjets induced by hemispherical cavitation bubbles
Authors: Gonzalez Avila, Silvestre Roberto
Song, Chaolong
Ohl, Claus-Dieter
Keywords: DRNTU::Engineering::Mechanical engineering::Fluid mechanics
Issue Date: 2015
Source: Gonzalez Avila, S. R., Song, C., & Ohl, C.-D. (2015). Fast transient microjets induced by hemispherical cavitation bubbles. Journal of fluid mechanics, 767, 31-51.
Series/Report no.: Journal of fluid mechanics
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 m 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∼4600. We demonstrate that these microjets can penetrate into soft material; thus they can be potentially used as a needleless drug delivery device.
DOI: 10.1017/jfm.2015.33
Rights: © 2015 Cambridge University Press. This paper was published in Journal of Fluid Mechanics and is made available as an electronic reprint (preprint) with permission of Cambridge University Press. The paper can be found at the following official DOI: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles
SPMS Journal Articles

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