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Flow structure of bubbles in non-newtonian fluid bu visualization of unsteady stress field

Research Project

Project/Area Number 22K20403
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0301:Mechanics of materials, production engineering, design engineering, fluid engineering, thermal engineering, mechanical dynamics, robotics, aerospace engineering, marine and maritime engineering, and related fields
Research InstitutionTokyo University of Agriculture and Technology

Principal Investigator

Kusuno Hiroaki  東京農工大学, 工学(系)研究科(研究院), 特任助教 (90966029)

Project Period (FY) 2022-08-31 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords気泡 / 非ニュートン / 偏光計測 / 偏光 / 抗力 / 境界層 / 光弾性
Outline of Research at the Start

本研究では,主応力差に比例する位相差と方位角を検出できる光弾性法より実験的に場を計測し,非ニュートン流体中を上昇する球形気泡の流動構造,特に境界層と後流の発達メカニズムを実験的に解明する.本研究の特徴は,数値解析検証を経て実験的に気泡近傍の位相差を計測する点,境界層および後流の発達メカニズムから順に非ニュートン流体効果を議論する点にある.

Outline of Final Research Achievements

In this research, the stress field in the vicinity of a bubble was experimentally measured using a polarization measurement technique, which can detect the phase retardation and azimuth angle that would be proportional to the principal stress difference, and the non-Newtonian fluid effect was discussed in turn from the flow structure of a bubble rising in a non-Newtonian fluid.
The validity of the stress measurement results around bubbles in Newtonian fluid using a polarization measurement technique was verified in detail. The results were compared with numerical analysis, and plane stresses were estimated by using an axisymmetric reconstruction method that differs from that used for solids.
In addition, a numerical code that can be applied to various viscoelastic models was developed to validate the polarization measurement around bubbles in viscoelastic fluids with significantly varying bubble rise velocities.

Academic Significance and Societal Importance of the Research Achievements

流体の偏光計測手法によって応力積算値を可視化し,軸対称問題であればそれを再構成することで平面応力場を導出することができれば,様々な流体計測が可能になる.また,非ニュートン流体においても,流動構造の違いによって偏光計測のから予想される流動場が異なることから,様々な非ニュートン流体の流動特性の計測に利用できると考えられる.
気泡周りの流動構造を実験的に観測したことにより,その結果は気泡など多くの粘弾性流体特有の流動現象のメカニズム解明や数値解析の検証に用いることができると考えられる.

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (5 results)

All 2023 2022 Other

All Presentation (4 results) (of which Int'l Joint Research: 2 results) Remarks (1 results)

  • [Presentation] 偏光計測による界面活性剤水溶液中を上昇する気泡周りの流れ可視化2023

    • Author(s)
      楠野宏明
    • Organizer
      混相流シンポジウム2023
    • Related Report
      2023 Annual Research Report
  • [Presentation] How does the flow structure of a gradually contaminating bubble evolve2023

    • Author(s)
      Hiroaki Kusuno
    • Organizer
      76th Annual Meeting of the Division of Fluid Dynamics
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Polarization measurement of flow structure around a moving bubble/solid in a quiescent liquid2023

    • Author(s)
      Hiroaki KUSUNO
    • Organizer
      International conference on multiphase flow
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 偏光計測による単一気泡周りの流動構造解析2022

    • Author(s)
      楠野宏明
    • Organizer
      流体工学部門講演会
    • Related Report
      2022 Research-status Report
  • [Remarks]

    • URL

      http://web.tuat.ac.jp/~tagawayo/publications/conferences.html

    • Related Report
      2022 Research-status Report

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Published: 2022-09-01   Modified: 2025-01-30  

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