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An experimental study on the effect of polymers on the sustaining mechanism of turbulent heat transfer in turbulent water duct flow

Research Project

Project/Area Number 11650222
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Thermal engineering
Research InstitutionKyoto Institute of Technology

Principal Investigator

HAGIWARA Yoshimichi  Kyoto Institute of Technology Faculty of Engineering and Design, Professor, 工芸学部, 教授 (50144332)

Co-Investigator(Kenkyū-buntansha) TANAKA Mitsuru  Kyoto Institute of Technology Faculty of Engineering and Design, Research Associate, 工芸学部, 助手 (20281115)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 2000: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1999: ¥2,100,000 (Direct Cost: ¥2,100,000)
KeywordsTurbulent heat transfer / Coherent structure / Turbulent water duct flow / Sustaining mechanism / Polymer lumps / Flow visualization / particle tracking velocimetry / Laser induced fluorescence / 維持機構
Research Abstract

We developed new techniques for simultaneous visualization of near-wall coherent structure, lumps of entangled polymers and thermal field in a turbulent water duct flow with an introduction of dilute polymer solution from a transverse slot into the buffer region. The main conclusions obtained are as follows.
1.The fine particles of fluorescence color, the hydrogen bubbles, dye introduced into the viscous sublayer were found to be effective for the simultaneous visualization for the entangled polymers, the streamwise vortices, and the low-speed streaks, respectively.
2.The green-color images contain reflected light from the bubbles, while the red-color images contain fluorescence from the color particles and the dye. Therefore, the motions of bubbles, color particles and dye can be measured independently.
3.The eruptive flow induced by the streamwise vortices was measured by applying a PTV technique to the motion of bubbles. It was observed that the evolution of streamwise vortices, and thus the eruptive flow and the lift-up of low-speed streaks were attenuated by the polymer lumps.
4.The planer laser-induced fluorescence(PLIF)technique is found to be promising for the measurement of thermal filed in the buffer layer.
5.The combination of PLIF, the visualization method with color particles and hydrogen bubbles, and the image-capturing system with two cameras were found to be promising to the simultaneous observation of thermal field, the vortices and the entangled polymers.
6.A decrease in the temperature at the buffer layer due to the flow induced by the streamwise vortices was measured. It was observed that the entangled polymers attenuated the generation and evolution of the vortices and thus the aforementioned temperature fluctuation.

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] Y.Hagiwara ほか3名: "Numerical simulation of the interactions of highly entangled polymers with coherent structure in a turbulent channel flow"Int.J.Heat and Fluid Flow. Vol.21. 589-598 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Hagiwara ほか3名: "Direct interaction between highly-entangled polymers and small-scale coherent structures in a turbulent polymer-solution flow"Advances in Turbulence VIII. 487-490 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Hagiwara: "Effects of polymers, particle clusters or droplets on the evolution of coherent structure in near-wall turbulence"Proc.US-Japan Seminar on Two-phase Flow Dynamics. 465-473 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Hagiwara ほか2名: "Visualization for local attenuation of heat transfer by entangled polymers in turbulent dilute polymer-solution flow using PLIF"Proc.3^<rd> Pacific Symposium on Flow Visualization and Image Processing. (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 今村太郎 ほか3名: "水乱流中の高分子塊と低速ストリークおよび縦渦の同時可視化"第37回日本伝熱シンポジウム講演論文集. 第3巻. 855-856 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Hagiwara et al.: "Numerical simulation of the interactions of highly entangled polymers with coherent structure in a turbulent channel flow"Int.J.Heat and Fluid Flow. Vol.21. 589-598 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Hagiwara et al.: "Direct interaction between highly-entangled polymers and small-scale coherent structures in a turbulent polymer-solution flow"Advances in Turbulence VIII. 487-490 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Hagiwara: "Effects of polymers, particle clusters or droplets on the evolution of coherent structure in near-wall turbulence"Proc.US-Japan Seminar on Two-phase Flow Dynamics. 465-473 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Hagiwara et al.: "Visualization for local attenuation of heat transfer by entangled polymers in turbulent dilute polymer-solution flow using PLIF"Proc.3^<rd> Pacific Symposium on Flow Visualization and Image Processing. (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Imamura et al.: "The Simultaneous visualization of polymer lumps, low-speed streaks and quasi-streamwise vortices in a turbulent duct flow(in Japanese)"Proc.37^<th> National Heat Transfer Symposium, Japan. Vol.3. 855-856 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Hagiwara ほか3名: "Numerical simulation of the interactions of highly entangled polymers with coherent structure in a turbulent channel flow"Int.J.Heat and Fluid Flow. Vol.21. 589-598 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Y.Hagiwara ほか3名: "Direct interaction between highly-entangled polymers and small-scale coherent structures in a turbulent polymer-solution flow"Advances in Turbulence VIII. 487-490 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Y.Hagiwara: "Effects of polymers, particle clusters or droplets on the evolution of coherent structure in near-wall turbulence"Proc.US-Japan Seminar on Two-phase Flow Dynamics. 465-473 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Y.Hagiwara ほか2名: "Visualization for local attenuation of heat transfer by entangled polymers in turbulent dilute polymer-solution flow using PLIF"Proc.3^<rd> Pacific Symposium on Flow Visualization and Image Processing. (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 今村太郎ほか3名: "水乱流中の高分子塊と低速ストリークおよび縦渦の同時可視化"第37回日本伝熱シンポジウム講演論文集. (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Hagiwara ほか3名: "Direct ineraction between highly-entangled polymers and small-scale coherent structures in a turbulent polymer-solution flow"Proc. 8th European Turbulence Conf.. (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Hagiwara ほか3名: "Numerical simulation of the interactions of highly entangled polymers with coherent structure in a turbulent channel flow"Turbulence and Shear Flow-1. 313-318 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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