Physical investigation of the inception and collapse of cavitation bubbles by pressure waves

2015 Fiscal Year Final Research Report

• Project/Area Number: 25289034
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: Osaka Prefecture University
• Principal Investigator: Takahira Hiroyuki 大阪府立大学, 工学(系)研究科(研究院), 教授 (80206870)
• Co-Investigator(Kenkyū-buntansha): OGASAWARA TOSHIYUKI 大阪府立大学, 工学研究科, 助教 (00552184)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 流体工学 / キャビテーション / 気泡 / 圧力波 / 相変化

Outline of Final Research Achievements

The shock wave-bubble interaction was investigated numerically using an improved ghost fluid method by considering the nonequilibrium phase transition through the bubble interface. The simulation was in good agreement with the corresponding experiment. Also, the cavitation inception by the backscattering of ultrasound from a bubble was investigated experimentally and numerically. The relationship between the cavitation inception location and the pressure field around the bubble was characterized. The growth mechanism of cavitation cloud by the backscattering of ultrasound was clarified. The growth and collapse of a bubble between two parallel rigid walls were also investigated experimentally and numerically. The regimes of bubble collapse between the walls were obtained, and the influence of liquid jets and shock waves by bubble collapse on the material damages was clarified.

Free Research Field

機械工学・流体工学