Inception and dynamics of traveling-bubble-type cavitation in a venturi

被引：0
作者：
Sato, Keiichi [1 ]
Hachino, Kouji [1 ]
Saito, Yasuhiro [1 ]
机构：
[1] Dept. of Mech. and Mech. Syst. Eng., Kanazawa Institute of Technology, Ishikawa, 921-8501, 7-1 Ogigaoka, Nonoichi
来源：
Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B | 2004年 / 70卷 / 689期
关键词：
Bubble dynamics; Cavitation inception; Cavitation susceptibility; High-speed-video observation; Venturi flow;
D O I：
10.1299/kikaib.70.69
中图分类号：
学科分类号：
摘要：
The inception of cavitation is basically caused by a bubble nucleus which flows into the low pressure region in liquid flow. Therefore the phenomenon is dependent on the tensile strength or the nuclei concentration of tested water. In the present paper, to establish a measurement method of cavitation susceptibility using a venturi tube, the following points are investigated, such as the relation between the occurrence rate of cavitation bubbles and cavitation number, the measurement of positions and local pressure of bubble occurrence, and the high-speed video observation of bubble aspects from inception to collapse. As the result, the main points obtained are as follows. A traveling-bubble cavitation appears dominantly in a nozzle-type venturi with little possibility of flow separation. Cavitation aspects and bubble occurrence rate change with cavitation number and water quality. The various behaviors of traveling bubble cavitation in a venturi are observed using a high-speed video camera system.
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页码：69 / 76
页数：7
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