Numerical Analysis of Nonspherical Bubble Collapse Behavior and Induced Impulsive Pressure during First and Second Collapses near the Wall Boundary

• OCHIAI Naoya

  Graduate School of Engineering, Tohoku University

• IGA Yuka

  Institute of Fluid Science, Tohoku University

• NOHMI Motohiko

  EBARA Corporation

• IKOHAGI Toshiaki

  Institute of Fluid Science, Tohoku University

抄録

Cavitation often involves an abrupt phase change phenomenon. This phenomenon causes cavitation erosion on the material surface. In particular, violent bubble collapse near the material surface causes severe erosion. Numerical simulation is a powerful approach by which to clarify the high-speed, complex bubble collapse behavior near the wall boundary. In the present study, numerical analysis of nonspherical bubble collapse behavior and induced impulsive pressure at several initial standoff distance from the wall boundary is performed using a locally homogeneous model of a gas-liquid two-phase medium. The second collapse is confirmed to be more violent than the first collapse, and a circular erosion pattern is predicted owing to a toroidal bubble collapse attached to the wall boundary at a certain standoff distance. The influence of the symmetry breaking of the initial spherical bubble shape on the collapse behavior is investigated, and the asymmetry is found to influence the second bubble collapse, especially the generation of the high impulsive pressure in the central area.

収録刊行物

• Journal of Fluid Science and Technology

  Journal of Fluid Science and Technology 6 (6), 860-874, 2011

  一般社団法人 日本機械学会

キーワード

• Nonspherical Bubble Collapse
• Numerical Analysis
• Second Collapse
• Impulsive Pressure
• Cavitation Erosion
• Homogeneous Model

詳細情報

• CRID: 1390282680223661696
• NII論文ID: 130000977699
• DOI: 10.1299/jfst.6.860
• ISSN: 18805558
• Web Site: http://www.jstage.jst.go.jp/article/jfst/6/6/6_6_860/_pdf
• 本文言語コード: en
• データソース種別:
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