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2013 Fiscal Year Final Research Report

Experimental study for multi-scale vortex structure around a rotating circular cylinder in the stratified fluid and the measurement of fluctuating wall shear stress by electro-chemical method

Research Project

  • PDF
Project/Area Number 23560213
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Fluid engineering
Research InstitutionHiroshima Institute of Technology

Principal Investigator

FUKUSHIMA Chiharu  広島工業大学, 工学部, 教授 (30262752)

Project Period (FY) 2011 – 2013
Keywords流体工学 / 環境対応 / 密度成層 / せん断応力 / 渦
Research Abstract

An experimental study has conducted to understand the relationship between multi-scale vortex structures developed around a rotating circular stratified flow and the fluctuating wall shear stress. In order to examine the validity of the electro-chemical method for wall shear stress, preliminary experiments were achieved in the pipe flow, circular Couette flow, and flow around a circular cylinder at rest. As the results, electro-chemical method had not established satisfactory, because fluctuating wall shear stress contains unsolved noise. The flow induced by impulsively rotating circular cylinder, rolls up the mushroom-type vortex ring array, and the evolution of the vortices lead to subsequent large-scale layered formation, i.e. multi-scale vortex structure. During the layered formation and the rearrangement of the vortices, the flow exhibits oscillating motion. Those typical spatial and temporal scales of velocity and density field were extracted.

  • Research Products

    (3 results)

All 2013 2012

All Presentation (3 results)

  • [Presentation] 成層流体中で回転運動を開始した円筒まわりの流れ(速度場-密度場の同時観察による層構造内部の調査)2013

    • Author(s)
      飛田真吾,福島千晴,中西助次
    • Organizer
      日本機械学会中国四国支部第51期総会・講演会
    • Place of Presentation
      高知工科大学(高知県香美市)
    • Year and Date
      2013-03-08
  • [Presentation] 電気化学的手法を用いた壁面せん断応力の測定(一様流中の円柱周りの流れ)2013

    • Author(s)
      近藤瑞生,福島千晴,中西助次
    • Organizer
      日本機械学会中国四国支部第51期総会・講演会
    • Place of Presentation
      高知工科大学(高知県香美市)
    • Year and Date
      2013-03-08
  • [Presentation] 成層流体中で回転運動を開始した円筒まわりの流れ(速度場-密度場変化の同時観察)2012

    • Author(s)
      福島千晴,飛田真吾,中西助次
    • Organizer
      日本機械学会中国四国支部第50期総会・講演会
    • Place of Presentation
      広島大学(東広島市)
    • Year and Date
      2012-03-08

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Published: 2015-07-16  

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