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Study on formula for predicting convective heat transfer coefficient in urban canopy layer taken account of atmospheric stability

Research Project

Project/Area Number 16560529
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Architectural environment/equipment
Research InstitutionTOKYO POLYTECHNIC UNIVERSITY

Principal Investigator

OHBA Masaaki  Tokyo Polytechnic University, Faculty of Engineering, Professor, 工学部, 教授 (90130947)

Co-Investigator(Kenkyū-buntansha) KOBAYASHI Nobuyuki  Tokyo Polytechnic University, Faculty of Engineering, President, 学長 (70097301)
KURITA Tsuyosi  Wind Engineering Center Co., Ltd, Researcher, 技術部・研究員
OHGURO Masayuki  Taisei Construction Ltd., Researcher, 建築技術研究所, 主任研究員
Project Period (FY) 2004 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2005: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2004: ¥2,300,000 (Direct Cost: ¥2,300,000)
KeywordsConvective heat transfer coefficient / Thermally stratified wind tunnel / Urban canopy laver / Atmospheric stability / Bulk Richardson number / 対流熱伝達率
Research Abstract

The present study attempted to elucidate the formula for predicting convective heat transfer coefficient in urban canopy layer by using a thermally stratified wind tunnel. The following results were obtained by the reserach for two years.
1.Characteristics of kinematics and heat flux in unstable flow
The wind velocity and temperature in unstable layer were measured by using hot-wire and cold-wire simultaneously. The turbulence intensity on U and W component was found to be higher when bulk Richardson number indicated unstable. The horizontal momentum fluxes were kept constant regardless of bulk Richardson numbers. Vertical heat fluxes had maximum values at a height of 1/5 to 1/4 of thermal boundary layer thickness regardless of bulk Richardson numbers.
2.Thermal characteristics in the wake near behind two-dimensional fence
Compared to the case without 2-D fence, the temperature behind the fence increased and vertical heat fluxes indicated negative value at a height of fence.
3.Experimental formula for predicting convective heat transfer coefficients in urban canopy layer
The bulk Richardson number of approaching flow was varied in a range of 0 to -0.26 according to the change of wind velocity in a condition that the floor panel of thermal stratified wind tunnel was kept constant. As a result, the convective heat transfer coefficient was higher when the instability of airflow increased. The experimental formula was achieved expressing the convective heat transfer coefficient as a function of bulk Richardson number and wind velocity. The convective heat transfer coefficient increased when bulk Richardson number indicated unstable. In order to compare with the formula of the convective heat transfer coefficients proposed by other researchers, experimental data must be accumulated for obtaining a high-precision experimental regression formula.

Report

(3 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • Research Products

    (14 results)

All 2006 2005 2004

All Journal Article (14 results)

  • [Journal Article] 都市キャノピー層を対象とした温度と風速の特性に関する実験的研究その2 運動量フラックスと熱フラックスの特性2006

    • Author(s)
      栗田 剛, 大場正昭
    • Journal Title

      日本建築学会大会学術講演梗概集(関東) (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Experimental Study on Characteristics of Temperature and Wind velocity in Urban Canopy Layer Part 2 Study on airflow characteristics in unstable layer measured by hot-wire and cold-wire2006

    • Author(s)
      Tsuyoshi Kurita, Masaaki Ohba
    • Journal Title

      Summaries of technical papers of annual meeting A.I.J

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] A Study on Formula for Predicting Convective Heat Transfer Coefficient in Urban Canopy Layer Taken Account of Atmospheric Stability2005

    • Author(s)
      Tsuyoshi KURITA, Masaaki Ohba
    • Journal Title

      10th Americas Conference on Wind Engineering

      Pages: 200-201

    • NAID

      130004644226

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 不安定流れ場における温度・気流性状に関する風洞実験2005

    • Author(s)
      栗田 剛, 大場正昭
    • Journal Title

      日本風工学会誌 Vol30,No2

      Pages: 109-110

    • NAID

      10015692131

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 都市キャノピー層を対象とした温度と風速の特性に関する実験的研究その1 運動量フラックスと熱フラックスの特性2005

    • Author(s)
      栗田 剛, 大場正昭
    • Journal Title

      日本建築学会大会学術講演梗概集(近畿)

      Pages: 743-744

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 温度成層風洞を用いた都市域の対流熱伝達率に関する基礎的研究(その2)不安定成層流れの特性2005

    • Author(s)
      栗田 剛, 大場正昭
    • Journal Title

      大気環境学会年会講演要旨集

      Pages: 257-257

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] A Study on Formula for Predicting Convective Heat Transfer Coefficient in Urban Canopy Layer Taken Account of Atmospheric Stability2005

    • Author(s)
      Tsuyoshi Kurita, Masaaki Ohba
    • Journal Title

      10th Americas Conference on Wind Engineering

      Pages: 200-201

    • NAID

      130004644226

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Wind Tunnel Study of Heat and Momentum Transfer on Unstable Flow2005

    • Author(s)
      Tsuyoshi Kurita, Masaaki Ohba
    • Journal Title

      Wind engineers, JAWE Vol.30,No.2

      Pages: 109-110

    • NAID

      10015692131

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Experimental Study for Characteristics of Temperature and Wind velocity on Urban Canopy Layers Part 1 Characteristics of kinematics flux and heat flux2005

    • Author(s)
      Tsuyoshi Kurita, Masaaki Ohba
    • Journal Title

      Summaries of technical papers of annual meeting A.I.J

      Pages: 743-744

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Fundamental study for convective heat transfer coefficient in urban canopy layer using thermally stratified wind tunnel Part 2 Characteristics of unstable flow2005

    • Author(s)
      Tsuyoshi Kurita, Masaaki Ohba
    • Journal Title

      Summaries of technical papers of annual meeting JSAE

      Pages: 257-257

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Fundamental Study on Formula for Predicting Convective Heat Transfer Coefficient above Heated Panels Using Thermally Stratified Wind Tunnel2005

    • Author(s)
      T.Kurita, M.Ohba
    • Journal Title

      10th ACWE Book of Extended Abstracts

      Pages: 200-201

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 大気安定度を考慮した都市キャノピー層の対流熱伝達率予測に関する基礎的研究2004

    • Author(s)
      栗田 剛, 大場正昭他
    • Journal Title

      第18回風工学シンポジウム論文集

      Pages: 75-80

    • NAID

      130004644226

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Study on Formula for Predicting Convective Heat Transfer Coefficient in Urban Canopy Layer Taken Account of Atmospheric Stability2004

    • Author(s)
      Tsuyoshi Kurita et al.
    • Journal Title

      Proceedings of 18th national symposium on wind engineering

      Pages: 75-80

    • NAID

      130004644226

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 大気安定度を考慮した都市キャノピー層の対流熱伝達率に関する基礎的研究2004

    • Author(s)
      栗田剛, 大場正昭, 名和健太郎
    • Journal Title

      第18回風工学シンポジウム論文集

      Pages: 75-80

    • Related Report
      2004 Annual Research Report

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Published: 2004-04-01   Modified: 2016-04-21  

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