• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Experimental Study of Turbulence Structure in Pulsatile Pipe Flow

Research Project

Project/Area Number 62550131
Research Category

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

Allocation TypeSingle-year Grants
Research Field Fluid engineering
Research InstitutionOsaka University

Principal Investigator

IGUCHI Manabu  Fac. Eng. Osaka University, Assistant, 工学部, 助手 (00043993)

Project Period (FY) 1987 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1988: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1987: ¥1,100,000 (Direct Cost: ¥1,100,000)
KeywordsUnsteady Flow / Pulsatile Pipe Flow / Propagation of Turbulence / Ordered Motions / Reynolds Shear Stress / Relaminarization / Transient Flow / 乱流スラグ / うず動粘性係数 / バースト周波数
Research Abstract

1. A couditional sampling technic based on four quadrant classification was used to clarify the turbulence structure in pulsatile pipe flows. The pulsation frequency was chosen to be about one tenth of mean burst frequency. Turbulence was generated near the wall by the same ordered motions as in a steady turbulent pipe flow. It propagated monotonically in the radial direction while decaying, but the decay rate was not affected by pulsation.
2. A time lag t exists between the fundamental components of the cross-sectional mean velocity um and the root mean square value u'rms of the axial velocity component u'. The smallest value of t was designated by tg, and tnd the radial position at which t = tg was defined as the generation position of turbulence yg. yg was well approximated by yg 20.
3. The radial propagation time of turbulence ( t- tg) was not affected by pulsation. Meanwhile, tg depended on pulsation and increased with increasing pulsation frequency. Both ( t- tg) and tg were dependent on the time-averaged Reynolds number Re ta. They decreased with increasing Re ta.
4. Near the generation position ( t- tg) is well correlated by inner variables, u^^-_*,ta and .
5. The measured values of ( t- tg) near the pipe center were well correlated by u^^-_*,ta and pipe radius R.
6. Two empirical equations for ( t- tg) were proposed.
7. Models for the Reynolds shear stress and eddy visocosity in pulsatile pipe flow were proposed.
8. Standing wave appeared when f was increased up to about 20 Hz, and relaminarization of flow occured under temporal as well as spatial accelerations. Turbulence structure in the relaminarizing process was investigated.
9. The behavior of turbulent slugs in transient pipe flow was clarified.

Report

(3 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • 1987 Annual Research Report
  • Research Products

    (33 results)

All Other

All Publications (33 results)

  • [Publications] 井口学: 日本機械学会論文集B編. 53. 706-713 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 井口学: 日本機械学会論文集B編. 53. 3546-3554 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Manabu Iguchi: JSME Int.J.31. 623-631 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 井口学: 日本機械学会論文集B編. 54. 308-313 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 井口学: 日本油空圧学会油空圧機器の動特性研究委員会報告書. 51-59 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 井口学: 日本油空圧学会油空圧機器の動特性研究委員会報告書. 70-80 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 井口学: 日本機械学会論文集B編. 54. 541-546 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Manabu Iguchi: JSME Int.J.32. (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Manabu Iguchi: JSME Int.J.32. (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 近江宗一: 日本機械学会PーSC104流体機械・管路系内流れの非定常特性とその解析に関する調査研究分科会成果報告書. 2-5 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 井口学: 日本機械学会PーSC104流体機械・管路系内流れの非定常特性とその解析に関する調査研究分科会成果報告書. 6-10 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Manabu IGUCHI: "Turbulence Structure in a Relatively Low Frequency Pulsatile Pipe Flow" Trans. Jpn. Soc. Mech. Eng.53. 706-713 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Manabu IGUCHI: "The Structure of Turbulence in Pulsatile Pipe Flow Accompanied by Relaminarization" Trans. Jpn. Soc. Mech. Eng.53. 3546-3554 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Manabu IGUCHI: "The Structure of Turbulence in Pulsatile Pipe Flow Accompanied by Relaminarization" JSME International Journal. 31. 623-631 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Manabu IGUCHI: "Pulsatile Turbulent Flow in a Pipe" Reports on the Dynamic Response of Fluid in Pipes used in Hydraulics and Pneumatics (Jpn. Hydraulics & Pneumatics Society). 1. 51-59 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Manabu IGUCHI: "Turbulent Transition in Oscillatory Flow in Pipes and Ducts" Reports on the Dynamic Response of Fluid in Pipes used in Hydraulics and Pneumatics (Jpn. Hydraulics & Pneumatics Society). 1. 70-80 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Manabu IGUCHI: "Radial Propagation of Turbulence in Pulsatile Pipe Flow (in Japanese)" Trans. Jpn. Soc. Mech. Eng., Ser. B. 54. 308-313 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Manabu IGUCHI: "Behavior of Turbulent Slug in Transient Pipe Flow (in Japanese)" Trans. Jpn. Soc. Mech. Eng., Ser. B. 54. 541-546 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Manabu IGUCHI: "Radial Propagation of Turbulence in Pulsatile Pipe Flow" JSME International Journal. 32. (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Manabu IGUCHI: "Behavior of Turbulent Slug in Transient Pipe Flow" JSME International Journal. 32. (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Munekazu OHMI: "Initiation and Propagation Characteristics of Turbulent Slug in Pulsatile Pipe Flow (in Japanese)" Reports on the Unsteady Flows in Hydraulic Machines and Pipes (P-SC104, Jpn. Soc. Mech. Eng.). 1. 2-5 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Manabu IGUCHI: "Turbulence Structure in Pulsatile Pipe Flow (in Japanese)" Reports on the Unsteady Flows in Hydraulic Machines and Pipes (P-SC104, Jpn. Soc. Mech. Eng.). 1. 6-10 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 井口学: 日本油空圧学会 油空圧機器の動特性研究委員会報告書. 51-59 (1987)

    • Related Report
      1988 Annual Research Report
  • [Publications] 井口学: 日本油空圧学会 油空圧機器の動特性研究委員会報告書. 70-80 (1987)

    • Related Report
      1988 Annual Research Report
  • [Publications] 井口学: 日本機械学会論文集B編. 54. 541-546 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Manabu,Iguchi: JSME Int.J.32. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] Manabu,Iguchi: JSME Int.J.32. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] 近江宗一: 日本機械学会PーSC104流体機械・管路系内流れの非定常特性とその解析に関する調査研究分科会成果報告書. 2-5 (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] 井口学: 日本機械学会PーSC104流体機械・管路系内流れの非定常特性とその解析に関する調査研究分科会成果報告書. 6-10 (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] 井口学: 日本機械学会論文集B編. 53. 706-713 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] 井口学: 日本機械学会論文集B編. 53. 3546-3554 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] Manabu Iguchi: JSME Int. J.

    • Related Report
      1987 Annual Research Report
  • [Publications] 井口学: 日本機械学会論文集B編. 54. 308-313 (1988)

    • Related Report
      1987 Annual Research Report

URL: 

Published: 1987-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi