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Structure of Turbulent Heat Transfer in a Separated and Reattached Flow

Research Project

Project/Area Number 04650170
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Thermal engineering
Research InstitutionTohoku University

Principal Investigator

OTA Terukazu  Tohoku Univ., Faculty Eng., Professor, 工学部, 教授 (00006678)

Co-Investigator(Kenkyū-buntansha) YOSHIKAWA Hiroyuki  Tohoku Univ., Faculty Eng., Res. Assoc., 工学部, 助手 (40221668)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1993: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1992: ¥1,600,000 (Direct Cost: ¥1,600,000)
KeywordsConvective Heat Transfer / Turbulent Flow / Separated Flow / Reattached Flow / Boundary Layr / Heat Exchanger
Research Abstract

The purpose of the present study was to investigate the turbulent heat transfer mechanism in the separated, reattached, and redeveloped regions of two-dimensional air flow over a blunt flat plate with finite thickness. Measurements of heat transfer and flow were conducted using the same plate in order to clarified exactly the correlation between the heat transfer behaviors and the flow ones. The main points obtained are summarized as follows.
The maximum heat transfer coefficient locates at 8.2H( H being half plate thickness ) and the mean reattached point is 9.6H, which was determined as a point of 50% reverse flow rate. That is, the maximum heat transfer point exists somewhat downstream of the flow reattachment. At the point of maximum heat transfer coefficient, the reverse flow rate is only 15% and the temperature fluctuating intensity and the Reynolds stress near the wall are relatively higher compared to those at the reattachment point.
In the separation bubble, the location of the … More maximum temperature fluctuations in different from that of maximum velocity fluctuation and is situated in the outer region of the separated shear layr.
The integral time scale of the temperature fluctuation attains maximum near the dividing boundary in the separation bubble and minimum near the point of the maximum temperature fluctuation intensity. On the other hand, it does not show essential change in the whole region of the redeveloped flow.
The characteristics of the power spectra and probability density function depend strongly upon the flow feature, such as separated, reattached, and redeveloped flow regions. In the reattached flow region, there exists a broad hump of the power spectrum due to the shedding of large-scale eddies from the separation bubble. Furthermore, based on the results of the skewness and the flatness factors, the effect of the separation and reattachment of the flow upon the statistical features of the temperature fluctuation extends far downstream.
The correlation between the temperature fluctuation near the reattachment flow region and the velocity fluctuation of the low frequency flapping motion is found to be very weak and two components of the turbulent heat flux were measured using a triple wire probe. Less

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] 太田照和: "剥離と再付着を伴う鈍い平板まわりの乱流熱伝達" 第29回日本伝熱シンポジウム講演論文集. 14-15 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 太田照和: "傾斜後向きステップまわりの乱流熱伝達" 日本機械学会講演論文集. 931-1. 81-83 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 太田照和: "傾斜後向きステップまわりの乱流熱伝達" 第30回日本伝熱シンポジウム講演論文集. 793-795 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 太田照和: "鈍頭平板まわりの剥離と再付着を伴う流れおよび熱伝達の数値解析" 第30回日本伝熱シンポジウム講演論文集. 73-75 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 太田照和: "Numerical Analysis of a Separated and Reattached Flow over a Blunt Flat Plate" Proc.5th Int.Symp.on Computational Fluid Dynamics. 2. 423-428 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 太田照和: "鈍頭平板まわりの乱流熱伝達" 第31回日本伝熱シンポジウム講演発表予定. (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Ota, T., and Ohi, N.: "Turbulent Heat Transfer in a Separated and Reattached Flow over a Blunt Flat Plate" Proc. 29th NHTS of Japan. 14-15 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Ota, T., and Sugawara, Y.: "Turbulent Heat Transfer around an Inclined Downward Step" Preprint JSME. 931-1. 81-83 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Ota, T., and Sugawara, Y.: "Turbulent Heat Transfer around an Inclined Downward Step" Proc. 30th NHTS of Japan. 793-795 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Ota, T., and Yanaoka, H.: "Numerical Analysis of a Separated and Reattached Flow and Heat Transfer over a Blunt Flat Plate" Proc. 30th NHTS of Japan. 73-75 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Ota, T., and Yanaoka, H.: "Numerical Analysis of a Separated and Reattached Flow over a Blunt Flat Plate" Proc. 5th Int. Symp.CFD, 2. 423-428 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Ota, T., and Kom, T.: "Turbulent Heat Transfer around a Blunt Flat Plate" 31st NHTS of Japan. (in preparation).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 太田照和: "剥離と再付着を伴う鈍い平板まわりの乱流熱伝達" 第29回日本伝熱シンポジウム講演論文集. 14-15 (1992)

    • Related Report
      1993 Annual Research Report
  • [Publications] 太田照和: "傾斜後向きステップまわりの乱流熱伝達" 日本機械学会講演論文集. 931-1. 81-83 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 太田照和: "傾斜後向きステップまわりの乱流熱伝達" 第30回日本伝熱シンポジウム講演論文集. 793-795 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 太田照和: "鈍頭平板まわりの剥離と再付着を伴う流れおよび熱伝達の数値解析" 第30回日本伝熱シンポジウム講演論文集. 73-75 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 太田照和: "Numerical Analysis of a Separated and Reattached Flow over a Blunt Flat Plate" Proc.5th Int.Symp.on Computational Fluid Dynamics. 2. 423-428 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 太田照和: "鈍頭平板まわりの乱流熱伝達" 第31回日本伝熱シンポジウム講演. (発表予定). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] 太田 照和 大井 尚武: "剥離と再付着を伴う鈍い平板まわりの乱流熱伝達" 第29回日本伝熱シンポジウム講演論文集. 14-15 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 太田 照和 菅原 善宏: "傾斜後向きステップまわりの乱流熱伝達" 日本機械学会講演論文集. 931-1. 81-83 (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] 太田 照和 菅原 善宏: "傾斜後向きステップまわりの乱流熱伝達" 第30回日本伝熱シンポジウム講演発表予定. (1993)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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