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Title: Single cavitation bubble generation and observation of the bubble collapse flow induced by a pressure wave
Authors: S.H. Yang
S.Y. Jaw
K.C. Yeh
Contributors: 國立臺灣海洋大學:系統工程暨造船學系
Keywords: Pressure Wave
Cavitation Bubble
Solid Boundary
Bubble Surface
Bubble Collapse
Date: 2009-08
Issue Date: 2018-10-05T02:30:55Z
Publisher: Experiments in Fluids
Abstract: Abstract: This study utilizes a U-shape platform device to generate a single cavitation bubble for a detailed analysis of the flow field characteristics and the cause of the counter jet during the process of bubble collapse caused by sending a pressure wave. A high speed camera is used to record the flow field of the bubble collapse at different distances from a solid boundary. It is found that a Kelvin–Helmholtz vortex is formed when a liquid jet penetrates the bubble surface after the bubble is compressed and deformed. If the bubble center to the solid boundary is within one to three times the bubble’s radius, a stagnation ring will form on the boundary when impinged by the liquid jet. The fluid inside the stagnation ring will be squeezed toward the center of the ring to form a counter jet after the bubble collapses. At the critical position, where the bubble center from the solid boundary is about three times the bubble’s radius, the bubble collapse flow will vary. Depending on the strengths of the pressure waves applied, the collapse can produce a Kelvin–Helmholtz vortex, the Richtmyer–Meshkov instability, or the generation of a counter jet flow. If the bubble surface is in contact with the solid boundary, the liquid jet can only move inside-out without producing the stagnation ring and the counter jet; thus, the bubble collapses along the radial direction. The complex phenomenon of cavitation bubble collapse flows is clearly manifested in this study.
Relation: 47(2) pp.343-355
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50350
Appears in Collections:[系統工程暨造船學系] 期刊論文

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