| Project/Area Number |
22K20403
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| 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
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| Research Institution | Tokyo University of Agriculture and Technology |
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Principal Investigator |
Kusuno Hiroaki 東京農工大学, 工学(系)研究科(研究院), 特任助教 (90966029)
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| Project Period (FY) |
2022-08-31 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| 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)
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| Keywords | 気泡 / 非ニュートン / 偏光計測 / 偏光 / 抗力 / 境界層 / 光弾性 |
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| 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．
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| 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.
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| 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．
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