シリコンオイルによる水平チャネル内気泡流の摩擦抵抗特性

• 大石 義彦

  北海道大学大学院工学研究院エネルギー環境システム部門

• 村井 祐一

  北海道大学大学院工学研究院エネルギー環境システム部門

• 田坂 裕司

  北海道大学大学院工学研究院エネルギー環境システム部門

書誌事項

タイトル別名

• Friction Drag Characteristics in Horizontal Air-Silicone Oil Bubbly Channel Flow
• (1st report; Measurement of Frictional Drag and Gain Evaluation)
• (第1報　摩擦抵抗計測とゲイン評価)

抄録

Experiments on a bubbly channel flow utilizing silicone oil as the test fluid were performed to elucidate mechanisms of frictional drag reduction by bubbles: Using silicone oil overcomes problems of contaminations on bubble interfaces and allows large deformations of bubbles even at small Reynolds numbers (Re_m) because of its small surface tension. The local friction drag coefficient measured by a shear stress sensor indicated that the bubble injection introduces drag reduction even at low Reynolds number turbulent flows (Re_m ~ 1900) at which the reduction has never been observed in water channel. We also introduced evaluations of the drag reduction using a gain factor that includes energy spent for bubble injections. The gain factor for an actual ship was estimated on the experimental results to investigate applicability of the drag reduction technique for vessels.

収録刊行物

• 混相流

  混相流 28 (1), 71-80, 2014

  日本混相流学会

キーワード

• Drag reduction
• Shear stress
• Turbulence flow
• PTV
• Bubbly flow

詳細情報

• CRID: 1390282679414225536
• NII論文ID: 130004514129
• DOI: 10.3811/jjmf.28.71
• ISSN: 18815790
• ISSN: 09142843
• 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