Improvement of efficiency on frictional drag reduction by repetitive bubble injection

• Project/Area Number: 23760143
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Fluid engineering
• Research Institution: Hokkaido University
• Principal Investigator: TASAKA Yuji 北海道大学, 大学院・工学研究院, 准教授 (00419946)
• Co-Investigator(Renkei-kenkyūsha): MURAI Yuichi 北海道大学, 大学院・工学研究院, 教授 (80273001)
• Project Period (FY): 2011 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2011: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
• Keywords: 混相流 / 抵抗低減 / 流れ制御 / 流体計測 / 船舶省エネ技術 / 気泡流れ / 摩擦抵抗低減 / 気泡流 / 船舶 / 省エネ / 流体力学 / 乱流制御

Research Abstract

In order to improve efficiency of frictional drag reduction technique by injecting bubbles, we investigated flow of bubble mixture and developed measurement system for efficient flow control. Experimental investigations in a bubbly channel flow suggested basic mechanism of bubble clustering from a point of view of bubble-bubble interactions. We also developed a monitoring tool of flows and bubbles using ultrasonic wave. Applicability of the tool for actual vessels was discussed.

Research Products

• [Journal Article] 船舶のCO2排出削減へ向けた翼型気泡発生装置の最適化 (2012)
  • Author(s): 熊谷一郎，大藪剛志，櫛田崇文，村井祐一，田坂裕司，高橋義明
  • Journal Title: 日本機械学会論文集B編 Volume: 78 Pages: 500-503
  • NAID: 130002050690
  • Peer Reviewed
• [Presentation] Ultrasonic flow field measurement of a rotating flow with free surface (2012)
  • Author(s): Yuji TASAKA
  • Organizer: 8th Intl. Sym. On Ultrasonic Doppler Method forFluid Mechanics and Fluid Eng.
  • Place of Presentation: Schlosshotel Dresden-Pillnitz, Dresden, Germany
  • Year and Date: 2012-09-21
• [Presentation] 水平チャネル内流れにおける摩擦低減条件での気泡群の挙動 (2012)
  • Author(s): 大石義彦
  • Organizer: 日本機械学会第90期日本機械学会流体工学部門講演会
  • Place of Presentation: 同志社大学今出川キャンパス(京都)
• [Presentation] 水平チャネル乱流場における気泡クラスタリング (2012)
  • Author(s): 峠幸寛
  • Organizer: 日本混相流学会年会講演会2012
  • Place of Presentation: 東京大学柏キャンパス(千葉県柏市)
• [Presentation] 水平チャネル乱流場における気泡クラスタリング (2012)
  • Author(s): 峠幸寛
  • Organizer: 日本混相流学会年会講演会2012
  • Place of Presentation: 東京大学柏キャンパス（千葉県柏市）
• [Presentation] 水平チャネル内流れにおける摩擦低減条件での気泡群の挙動 (2012)
  • Author(s): 大石義彦
  • Organizer: 日本機械学会 第90期日本機械学会流体工学部門講演会
  • Place of Presentation: 同志社大学今出川キャンパス（京都）
• [Presentation] Shallow DOF-imaging of turbulent boundary layer accompanied with bubble cluster (2011)
  • Author(s): Yukihiro TOHGE, Yuji TASAKA, Ichiro KUMAGAI, Yuichi MURAI
  • Organizer: Proc. 7th Intl. Sym. Meas. Tech. for Multiphase Flow
  • Place of Presentation: Tianjin University, Tianjin, China
• [Presentation] Angled wing air induction for microbubble drag reduction (2011)
  • Author(s): Yuichi MURAI, Ichiro KUMAGAI, Yuji TASAKA, Yoshiaki TAKAHSHI
  • Organizer: Bulletin of 64th Annual Meeting of the Division of Fluid Dynamics, American Physical Society
  • Place of Presentation: The Baltimore Convention Center, Baltimore, USA
• [Presentation] Improvement on efficiency of frictional drag reduction by repetitive bubble injection (2011)
  • Author(s): Yuji TASAKA, Yuichi MURAI, Hun-Jin PARK, Yukihiro TOHGE
  • Organizer: Bulletin of 64th Annual Meeting of the Division of Fluid Dynamics, American Physical Society
  • Place of Presentation: The Baltimore Convention Center, Baltimore, USA
• [Book] Ultrasonic Doppler Velocity Profiler for Fluid Flow (2012)
  • Author(s): Yasushi Takeda
  • Publisher: Springer
• [Book] "Ultrasonic Doppler Velocity Profiler for Fluid Flow” in the series of “Fluid Mechanics and Its Applications (2012)
  • Author(s): Yasushi Takeda
  • Total Pages: 274
  • Publisher: Springer