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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/46462

Title: Flow visualization of bubble collapse flow
Authors: Jaw, S. Y;Chen, C. J;Hwang, R. R
Contributors: 國立臺灣海洋大學:機械與機電工程學系
Date: 2007
Issue Date: 2018-05-17T08:43:12Z
Publisher: Journal of Visualization
Abstract: Abstract:The flow induced by bubble collapse has been investigated for a long time, mainly motivated by the
urge to understand the cavitation phenomena (Vogel et al., 1989), and the applications on the surface
cleaning, metal hardening, or the micro fusion, etc. The collapse of cavitation bubbles formed in the
liquid due to the occurrence of vapor pressure can lead to the production of liquid jets and shock
waves. Detailed characteristics of the bubble collapse flow, such as the velocity and pressure
distributions, are required for engineering applications. However, they are not easy to be measured,
since the bubbles are small in size, generally micro meters to millimeters, and collapse in a very
short time, measured in micro seconds. Experimental studies of the bubble collapse flow using high
speed photography have been reported (Kodama and Tomita, 2000; Brown and Williams, 2000). Most
of them have provided only the qualitative flow characteristics, due to the limitation of the recording
devices. Both the frame transfer rate and the image resolution of the recording devices are not high
enough to reveal the detailed characteristics of the bubble collapse flow.
It is known that the time scale of the bubble collapse is proportional to the square root of the
bubble diameter. A large scale bubble provides better temporal and spatial resolution, which makes
the detailed measurements of bubble collapse flows easier. Measurements of the break-up of a large,
inflated rubber balloon in deep water were reported (Lawson et al., 1999). Experimental and
computational results obtained were well in agreement; however, the rubber balloon is not formed by
surface tension. Therefore, the balloon collapse flow can be quite different from the flow induced by
the collapse of the bubble formed by surface tension. Alternatively, soap bubble is a better choice to
perform the initiative analysis of the bubble collapse flow, since soap bubbles are formed by surface
tension. The pressure inside the soap bubble is known to be max
4
R p =Δ σ higher than the surrounding
atmosphere. In addition, soap bubbles can be easily generated to the size fit for the experiments. The
effects of the surface tension and the pressure gradient to the bubble collapse flow can be clearly
manifested. Flow visualization analyses of soap bubble collapse flow are thus performed in this
study.
Relation: 10(1) pp. 21-24
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/46462
Appears in Collections:[系統工程暨造船學系] 期刊論文

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