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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50348

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: Cavitation bubble
Kelvin-helmholtz vortices
Stagnation ring
Counter jet
Particle image velocimetry
Date: 2011-06
Issue Date: 2018-10-05T01:51:03Z
Publisher: Journal of Mechanics
Abstract: Abstract: This study utilized a U-shape platform device to generate a single cavitation bubble for the detail
analysis of the flow field characteristics and the cause of the counter jet during the process of bubble collapse
induced by pressure wave. A series of bubble collapse flows induced by pressure waves of different
strengths are investigated by positioning the cavitation bubble at different stand-off distances to the
solid boundary. It is found that the Kelvin-Helmholtz vortices are formed when the liquid jet induced by
the pressure wave penetrates the bubble surface. 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 impacted by the
penetrated jet. The liquid inside the stagnation ring is 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 flows will vary. Depending on
the strengths of the pressure waves applied, either just the Kelvin-Helmholtz vortices form around the
penetrated jet or the penetrated jet impacts the boundary directly to generate the stagnation ring and the
counter jet flow. This phenomenon used the particle image velocimetry method can be clearly revealed
the flow field variation of the counter jet. If the bubble surface is in contact with the solid boundary, the
liquid jet can only splash radially without producing the stagnation ring and the counter jet. The complex
phenomenon of cavitation bubble collapse flows are clearly manifested in this study.
Relation: 27(2)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50348
Appears in Collections:[系統工程暨造船學系] 期刊論文

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