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Open AccessArticle

PIV-Based Acoustic Pressure Measurements of a Single Bubble near the Elastic Boundary

1
Department of Research and Development, China Academy of Launch Vehicle Technology, Beijing 100076, China
2
School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
*
Authors to whom correspondence should be addressed.
Micromachines 2020, 11(7), 637; https://doi.org/10.3390/mi11070637
Received: 21 May 2020 / Revised: 22 June 2020 / Accepted: 23 June 2020 / Published: 29 June 2020
(This article belongs to the Special Issue Acoustofluidics)
The objective of this paper was to investigate acoustic pressure waves and the transient flow structure emitted from the single bubble near an elastic boundary based on the particle image velocimetry (PIV). A combination of an electric-spark bubble generator and PIV were used to measure the temporal bubble shapes, transient flow structure, as well as the mid-span deflection of an elastic boundary. Results are presented for three different initial positions near an elastic boundary, which were compared with results obtained using a rigid boundary. A formula relating velocity and pressure was proposed to calculate the acoustic pressure contours surrounding a bubble based on the velocity field of the transient flow structure obtained using PIV. The results show the bubbles near the elastic boundary presented a “mushroom” bubble and an inverted cone bubble. Based on the PIV-measured acoustic pressure contours, a significant pressure difference is found between the elastic boundary and the underside of the bubble, which contributed to the formation of the “mushroom” bubble and inverted cone bubble. Furthermore, the bubbles had opposite migration direction near rigid and elastic boundaries, respectively. In detail, the bubble was repelled away from the elastic boundary and the bubble was attracted by the rigid boundary. The resultant force made up of a Bjerknes force and buoyancy force dominated the migration direction of the bubble. View Full-Text
Keywords: particle image velocimetry (PIV); single bubble; acoustic pressure; flow structure particle image velocimetry (PIV); single bubble; acoustic pressure; flow structure
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MDPI and ACS Style

Yu, Q.; Xu, Z.; Zhao, J.; Zhang, M.; Ma, X. PIV-Based Acoustic Pressure Measurements of a Single Bubble near the Elastic Boundary. Micromachines 2020, 11, 637.

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