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Effect of Turbulence Parameter on Heat and Particle Diffusion in a Atmospheric Turbulenc

Research Project

Project/Area Number 17560145
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionToyohashi University of Technology

Principal Investigator

MAKITA Hideharu  Toyohashi Univ. of Tech., Department of Engineering, Professor, 工学部, 教授 (40135413)

Project Period (FY) 2005 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2006: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2005: ¥2,500,000 (Direct Cost: ¥2,500,000)
KeywordsFluid Engineering / Atmospheric Turbulence / Hear and Mass Transfer / Turbulent Diffusion / Meandering Motion / Wind Tunnel Experiments / Thermo Anemometer / Flow Visualization
Research Abstract

The present research aimed to examine the effect of turbulence parameter on heat and particle diffusion in a large-scale turbulence, R_λ=400 (Re_M =10^6〜10^7), generated by a turbulent shear flow generator. Its velocity and temperature fields were measured by a thermo-anemometer and a I-type cold-and X-type hot-wire probe. The streamwise evolution of thermal plume was obtained through statistical analysis on velocity and temperature fluctuations.
(1) The meandering motion of thermal plume was observed in a wind tunnel. The variation of probability density function of mean temperature gave good agreement with the Taylor's diffusion theorem and short time diffusion process was realized.
(2) The meandering motion was affected by the large-scale turbulent eddy. When the streamwise interval of thermal plume, LI, was almost same as the longitudinal integral scale, LI didn't change in the stremwise distance. When the spanwise length of the thermal plume equaled the lateral integral scale, its diffusion shifted to long time diffusion process.
(3) Compared with thermal diffusion in a grid turbulence field, heat flux was extremely large and spanwise thermal transportation was very active in the large-scale turbulence. As a result, the diffusion coefficient was K=180cm2/s for Rλ=430.

Report

(3 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • Research Products

    (15 results)

All 2007 2006 2005

All Journal Article (15 results)

  • [Journal Article] 大規模乱流中に置かれた連続点源からの熱拡散場の平均・変動特性2007

    • Author(s)
      蒔田, 宮田, 関下
    • Journal Title

      宇宙航空研究開発機構特別資料 SP

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Experiment of Heat Diffusion in a Uniform Turbulent Shear Flow2007

    • Author(s)
      H.Makita, Y.Nagao, N.Miyata, K.Taniguchi
    • Journal Title

      Proceedings of Annual Meeting of Tokai Branch JSME

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Characteristics of Mean and Fluctuating Temperature in a Thermal Plume from a Point Source in Large-Scale, Turbulence Fields2007

    • Author(s)
      H.Makita, N.Miyata, N.Sekishita
    • Journal Title

      Proceedings of the JAXA Workshops on "Investigation and Control of Boundary-Layer Transition" SP

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 大気乱流拡散の実験的シミュレーション2006

    • Author(s)
      蒔田, 関下
    • Journal Title

      日本機械学会 流体工学部門講演会 06-21

      Pages: 263-263

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] 大規模一様せん断乱流中で放出された熱プルームの拡散実験2006

    • Author(s)
      蒔田・他4名
    • Journal Title

      日本機械学会 東海学生会 第38回学生員卒業研究発表講演会

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Experimental Simulations of Atmospheric Turbulent Diffusion2006

    • Author(s)
      H.Makita, N.Sekishita
    • Journal Title

      Proceedings of Fluid Engineering Conference 2006 JSME No.06-21

      Pages: 263-263

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 大規模乱流中における熱噴流場の輸送機構の解明2005

    • Author(s)
      蒔田秀治, 宮田仁奈, 関下信正
    • Journal Title

      日本機械学会第83期流体工学部門講演会 講演論文集 No.05-32

      Pages: 250-250

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 大規模乱流場における粒子拡散に関する風洞実験(乱流レイノルズ数の変化による変動濃度特性について)2005

    • Author(s)
      小杉淳, 蒔田秀治
    • Journal Title

      日本機械学会第83期流体工学部門講演会 講演論文集 No.05-32

      Pages: 251-251

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 大規模乱流場における粒子拡散に関する風洞実験(変動濃度特性について)2005

    • Author(s)
      小杉淳, 蒔田秀治
    • Journal Title

      日本機械学会2005年度年次大会 講演論文集 No.05-1

      Pages: 301-301

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Analysis on Transport Mechanism of a Thermal Jet in a Large-Scale Quasi-Isotropic Turbulence2005

    • Author(s)
      H.Makita, N.Miyata, N.Sekishita
    • Journal Title

      Proceedings of Fluid Engineering Conference 2005 JSME, No.05-32

      Pages: 250-250

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Wind Tunnel Simulation on Particle Diffusion in Atmospheric Turbulence (Variation of Characteristics of Concentration Fluctuation for Turbulent Reynolds Number)2005

    • Author(s)
      A.Kosugi, H.Makita
    • Journal Title

      Proceedings of Fluid Engineering Conference 2005 JSME No.05-32

      Pages: 251-251

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Wind Tunnel Experiments on Atmospheric Turbulent Particle Diffusion (Characteristics of Concentration Fluctuation)2005

    • Author(s)
      A.Kosugi, H.Makita
    • Journal Title

      Proceedings of Mechanical Engineering Congress 2005 JSME No.05-01, Vol2

      Pages: 301-301

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 大規模乱流中における熱噴流場の輸送機構の解明2005

    • Author(s)
      蒔田秀治, 宮田仁奈, 関下信正
    • Journal Title

      日本機械学会第83期流体工学部門講演会講演論文集 No.05-32

      Pages: 250-250

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 大規模乱流場における粒子拡散に関する風洞実験(乱流レイノルズ数の変化による変動濃度特性について)2005

    • Author(s)
      小杉淳, 蒔田秀治
    • Journal Title

      日本機械学会第83期流体工学部門講演会講演論文集 No.05-32

      Pages: 251-251

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 大規模乱流場における粒子拡散に関する風洞実験(変動濃度特性について)2005

    • Author(s)
      小杉淳, 蒔田秀治
    • Journal Title

      日本機械学会2005年度年次大会講演論文集 No.05-1,2

      Pages: 301-301

    • Related Report
      2005 Annual Research Report

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Published: 2005-04-01   Modified: 2016-04-21  

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