Bubble Generation by a Cylinder Moving Beneath a Free Surface

• KUMAGAI Ichiro

  Faculty of Engineering, Hokkaido University

• MURAI Yuichi

  Faculty of Engineering, Hokkaido University

• TASAKA Yuji

  Faculty of Engineering, Hokkaido University

• NAKAMURA Naoya

  ATOX Co., Ltd.

抄録

Wave breaking and air bubble generation by a 2-D cylinder moving beneath a free surface were experimentally investigated. Measurements of the free surface profile and visualization of the air bubbles yield the threshold and the regime diagrams of the bubble generation, which depend on the cross-sectional shape of the cylinder, Reynolds number, effective Froude number, normalized depth of the cylinder and angle of attack. As the Reynolds and Froude numbers increase, the surface deformation becomes substantial in the downstream of the cylinder. A breaking wave with air entrainment occurs when the ratio of the wave height to the wave length is greater than ∼0.1. Our results provide useful information for design of facilities such as marine constructions and a hydrofoil air pump for drag reduction of ships.

収録刊行物

• Journal of Fluid Science and Technology

  Journal of Fluid Science and Technology 6 (6), 851-859, 2011

  一般社団法人 日本機械学会

キーワード

• Multi-Phase Flow
• Wave
• Bubble
• Cylinder
• Breaking Wave
• Air-Water Interface

詳細情報

• CRID: 1390282680223660288
• NII論文ID: 130000977698
• DOI: 10.1299/jfst.6.851
• ISSN: 18805558
• Web Site: http://www.jstage.jst.go.jp/article/jfst/6/6/6_6_851/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可