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Difference Between Active(Heat)-and passive Scalar Diffusions in Thermally Stratified Flow

Research Project

Project/Area Number 61550176
Research Category

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

Allocation TypeSingle-year Grants
Research Field Thermal engineering
Research InstitutionNational Institute for Environmental Studies

Principal Investigator

UEDA Hiromasa  National Institute for Environmental Studies,Section Head, 大気環境部, 室長 (70026186)

Co-Investigator(Kenkyū-buntansha) MIYAZAKI Takeshi  National Institute for Environmental Stidies,Researcher, 大気環境部, 研究員 (50142097)
MITSUMOTO Sigeki  National Institute for Environmental Stidies,Researcher, 大気環境部, 研究員 (20109903)
KOMORI Satoru  Kyushu University,Associated Professor, 工学部, 助教授 (60127082)
Project Period (FY) 1986 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1987: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1986: ¥800,000 (Direct Cost: ¥800,000)
KeywordsStratified flow / Scalar diffusion / Active-scalar / Turbulent boundary layer / Burger's turbulence / Fine structure turbulence / 乱流微細構造 / 濃度変動測定
Research Abstract

In the thermally stratifed flows temperature fluctuation induces buoyancy force and causes drastic changes in turbulence structure and transport porcesses.When the stratification is extremely stable,for example,it causes a counter-gradient diffusion of heat.However,mass(e.g.diluted pollutant) usually diffuses in the direction of its concentration gradient,even in such a flow field.The purpose of the present study is to make clear experimentally and theoretically the difference between the active-scalar(heat)and passive scalar diffusions.
1.Experimental investigation on scalar diffusion mechanisms:First a simultaneous measuring technique of two-species concentration fluctuations was established,which was besed on the laser-induced luminescence and Mie-scattering and consisted of a line-or area-photodetectory array.Superiority of this technique was confirmed by

Report

(2 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] Hiromasa UEDA: Atmospheric Environment. 20. 757-762 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Hiromasa UEDA: World Congress III of Chemical Engineering in Atmos.Environment. 3. 678-681 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Satoru KOMORI: World Congress III of Chemical Enginnring. 2. 320-323 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Satoru Komori: J.Fluid Mechanics.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Hiromasa UEDA: Transport Phenomena in Turbulent Flows. 1. 749-758 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Itsushi UNO: Quart.J.Roy.Meteorol.Soc.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Itsushi UNO: Boundary-Layer Meteorol.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Takeshi MIYAZAKI: Fluid Dynamics Research. 2. 25-33 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Ueda H.,Komori S.&Fukui K.: "A laboratory experiment on lateral diffusion of scalar quantities in the stratified surface layer." Atmospheric Environment,. Vol.20,No.4,. 757-762. (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Ueda,H.,Komori,S.& Kitada,T.: "Transport phenomena in the thermalinternal boundary layer." World Congress III of Chemical Engineering,. Vol.3,. 678-681. (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Komori,S.,Sawano,R.& Ueda,H.: "Coherent structures associated with bursting events in the wall region of open-channel flow." World Congress III of Chemical Engineering,. Vol.2,. 320-323. (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Komori,S.,Hiraga,Y.,Murakani,Y.& Ueda,H.: "Relationship Between surface renewal and bursting motions in and open-channel flow." Journal of Fluid Mechanics. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Ueda,H.Komori,S.& Fukui,K.: "Large-scale vortical structure in the turbulent boundary layer flow under unstably-stratified conditions." Transport Phenomena in Tufbulent Flows,Edt.by M.Hirata,Hemisphere Pub.Co.,pp.749-758. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Uno.I.& Ueda H.: "Fundamental aspects of the algebraic stress turbulence model to the application of stratified boundary layer." Quart.J.Roy.Meteorol.Soc.(1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Uno,I.,Wakamatsu.S.,Ueda.H.& Nakamura A.: "Turbulent structure of the nocturnal urban boundary layer." Boundary-layer Meteorol.(1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Miyazaki T.: "Diffusion equation coupled to Burger's equation." Fluid Dynamics Research.Vol.2,. 25-33. (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Komori,S.Kanzaki,T.Nurakami,Y.& Ueda,H.: "Simultaneous measurements of two-species concentration fluctuations in a turbulent flow by using a combined laser-induced fluorescence and laser-scattering techniques." Physics Fluids. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Hiromasa Ueda;Satoru Komori;Keisuke Fukui: Atmospheric Environment. 20. 757-762 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] Hiromasa Ueda;Satoru Komori;Toshihiro Kitada: World Congress 【III】 of Chemical Engineering. 3. 678-681 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] Satoru Komori;Hiromasa Ueda;Riichi Sawano: World Congress 【III】 of Chemical Engineering. 2. 320-323 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] Takeshi Miyazaki: Fluid Dynamics Research.

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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