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Relaxation of turbulent flow and heat transfer in rectangular ducts with a step change in surface roughness

Research Project

Project/Area Number 11650220
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Thermal engineering
Research InstitutionNagoya University

Principal Investigator

HIROTA Masafumi  Nagoya Univ., Mechanical Eng ., Assoc. Professor, 工学研究科, 助教授 (30208889)

Co-Investigator(Kenkyū-buntansha) NAKAYAMA Hiroshi  Nagoya Univ., Mechanical Eng., Research Assoc., 工学研究科, 助手 (40303656)
FUJITA Hideomi  Nagoya Univ., Mechanical Eng., Professor, 工学研究科, 教授 (10023136)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2000: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1999: ¥2,500,000 (Direct Cost: ¥2,500,000)
KeywordsComplex turbulent flow / Heat transfer / Relaxation process / Surface roughness / Secondary flow / Velocity field / Temperature field / Simultaneous measurement
Research Abstract

In turbulent flow through a duct with a rough-to-smooth step change of the surface roughness, the flow near the wall responds to this roughness change promptly. In the core region, however, the response of the flow is delayed relative to the vicinity of the wall, and thus the whole flow field attains to the new equilibrium state after a some distance downstream from the rough-to-smooth junction. This process of the streamwise variation of the field is called as relaxation process. In this study, the relaxation processes of turbulent flow and heat transfer in a rectangular channel with a rough-to-smooth step change of the surface roughness have been investigated experimentally.
As the first step, we have made clear the characteristics of the flow and temperature fields for a fully developed turbulent flow and heat transfer in a rectangular duct with rough walls, which correspond to the initial states at the rough-to-smooth step change of the surface roughness. Based on the detailed data, the mechanism of the turbulent transport process of momentum and heat has been clarified. Then, the relaxation process of the flow field in a rectangular duct with a rough-to-smooth step change of the surface roughness has been investigated. The streamwise variations of the mean velocity and the turbulent stress fields have been made clear. In ptarticular, it has been found that turbulence intensities once overshoot the level for the rough duct, then undershoot that for the smooth duct, and finally attain to the new equilibrium state. Next, the relaxation process of the temperature field in the same flow system has been investigated. From a comparison of the streamwise variations of the turbulent shear stresses and turbulent heat fluxes, we have elucidated that the temperature field attains to the new equilibrium state after a shorter distance from the rough-to-smooth junction than the flow field.

Report

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

    (28 results)

All Other

All Publications (28 results)

  • [Publications] 廣田真史: "対向2面に粗面をもつ正方形流路内の乱流熱伝達"日本機械学会論文集(B編). 65-639. 3762-3770 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 廣田真史: "粗面をもつ矩形流路内助走区間における局所熱(物質)伝達"流体熱工学研究. 34-2. 29-36 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masafumi Hirota: "Turbulent Heat Transfer in a Square Duct with Two Opposite Rib-Roughened Walls"Proc.1st Int.Symp.on Turbulence and Sear Flow Phenomena. Vol.1. 1255-1260 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masafumi Hirota: "Turbulent Flow in a Rectangular Duct with a Step Change in Surface Roughness"Proc.3rd Int.Symp.Turbulence, Heat and Mass Transfer. Vol.1. 167-174 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 廣田真史: "1面に粗面をもつ正方形流路内の乱流熱伝達"日本機械学会論文集(B編). 67-653. 154-161 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 廣田真史: "壁面粗度の急変を伴う長方形流路内乱流の弛緩過程"日本機械学会論文集(B編). 67-655. (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 廣田真史: "粗面をもつ正方形流路内の乱流熱伝達における乱流熱流束の生成"日本機械学会1999年度年次大会講演論文集. Vol.4. 135-136 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 廣田真史: "粗・滑面をもつ長方形流路内乱流の弛緩過程に関する研究"日本機械学会関西支部第257回講演会講演論文集. Vol.1. 5-21-5-22 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 廣田真史: "壁面粗度の急変を伴う正方形流路内乱流熱伝達の弛緩過程"日本流体力学会2000講演論文集. Vol.1. 91-92 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masafumi Hirota: "Heat Transfer for Turbulent Flow in a Square Duct with Two Rough Walls on Opposite Sides"Trans. Japan Society of Mechanical Engineers (B). 65-639. 3762-3770 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masafumi Hirota: "Local heat transfer characteristics in the entrance region of the rectangular duct with ribbed walls"Thermal and Fluid Engineering Research. 34-2. 29-36 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masafumi Hirota: "Turbulent Heat Transfer in a Square Duct with Two Opposite Rib-Roughened Walls"Proc. 1st Int. Symp. Turbulence and Shear Flow Phenomena. Vol.1. 1244-1260 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masafumi Hirota: "Turbulent Flow in Rectangular Duct with a Step Change in Surface Roughness"Proc. 3rd Int. Symp. Turbulence, Heat and Mass Transfer. Vol.1. 167-174 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masafumi Hirota: "Experimental Study on Turbulent Heat Transfer in a Square Duct with One Rib-Roughened Wall"Trans. Japan Society of Mechanical Engineers (B). 67-653. 154-161 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masafumi Hirota: "Relaxation Process of Turbulent Flow in a Rectangular Duct with a Step Change in Surface Roughness"Trans. Japan Society of Mechanical Engineers (B). 67-655. (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Gen-ichi Koarai: "Production of Turbulent Heat Flux in Turbulent Heat Transfer in a Square Duct with Rough Walls"Proc. 1999 JSME Annual Meeting. Vol.4. 135-136 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masafumi Hirota: "Response of Turbulent Flow in Rectangular Duct to a Step Change in Surface Roughness"Proc. 257th JSME Kansai Branch Annual Meeting. Vol.1. 5-21-5-22 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masafumi Hirota: "Relaxation of Turbulent Heat Transfer in a Square Duct with a Step Change in Surface Roughness"Proc. 2000 Meeting of Japan Society of Fluid Mechanics. Vol.1. 91-92 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masafumi Hirota: "Turbulent Heat Transfer in a Square Duct with Two Opposite Rib-Roughened Walls"Proc.1st Iht.Symp.on Turbulcnce and Sear Flow Phenomena. Vol.1. 1255-1260 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] 廣田真史: "対向2面に粗面をもつ正方形流路内の乱流熱伝達"日本機械学会論文集(B編). 65-639. 3762-3770 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] Masafumi Hirota: "Turbulent Flow in a Rectangular Duct with a Step Change in Surface Roughness"Proc.3rd Int.Symp.Turbulence,Heat and Mass Transfer. Vol.1. 167-174 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 廣田真史: "壁面粗度の急変を伴う正方形流路内乱流熱伝達の弛緩過程"日本流体力学会2000講演論文集. Vol.1. 91-92 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 廣田真史: "1面に粗面をもつ正方形流路内の乱流熱伝達"日本機械学会論文集(B編). 67-653. 154-161 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 廣田真史: "壁面粗度の急変を伴う長方形流路内乱流の弛緩過程"日本機械学会論文集(B編). 67-655. (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Masafumi Hirota: "Turbulent Heat Transfer in a Square Duct with Two Opposite Rib-Roughened Walls"Proc.1st Int.Symp.on Turbulence and Sear Flow Phenomena. Vol.1. 1255-1260 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 廣田真史: "対向2面に粗面をもつ正方形流路内の乱流熱伝達"日本機械学会論文集(B編). 65-639. 3762-3770 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 廣田真史: "粗・滑面をもつ長方形流路内乱流の弛緩過程に関する研究"日本機械学会関西支部第257回講演会講演論文集. Vol.1. 5-21-5-22 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Masafumi Hirota: "Turbulent Flow in a Rectangular Duct with a Step Change in Surface Roughness"Proc.3rd Int.Symp.Turbulence,Heat and Mass Transfer. Vol.1. (2000)

    • Related Report
      1999 Annual Research Report

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

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