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PULSATING FLOW IN CURVED PIPES SIMULATING AORTA

Research Project

Project/Area Number 05650185
Research Category

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

Allocation TypeSingle-year Grants
Research Field Fluid engineering
Research InstitutionYONAGO NATIONAL COLLEGE OF TECHNOLOGY

Principal Investigator

SUMIDA Masaru  YONAGO NATIONAL COLLEGE OF TECHNOLOGY., DEPT.MECH.ENGR., ASSOCI.PROF., 機械工学科, 助教授 (60113403)

Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1994: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1993: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsPULSATING FLOW / AORTA / CURVED PIPE / OSCILLATING FLOW / VELOCITY DISTRIBUTION / ENTRANCE REGION / 非定常流 / 二次流れ
Research Abstract

The blood flow in the aorta is a complex periodic flow that includes high frequency components. In this aortic arch circulatory faults occur frequently. Thus dealing with fluid dynamics has been of great importance even in our society today. In order to reveal the nature of flow development in the aorta, it is necessary to analyze the flow in curved pipes. The purpose of this project is to solve the problem of the oscillating and pulsating flows in the inlet region of curved pipes modelled on the aorta. By flow visualization method and LDV measurement, the following velocity distribution results were obtained.
1. On the oscillating flow. The flow in the curved pipe is closely related to the flow in the upper stream tangent, and the velocity distribution changes drastically with the phase at the inlet region. The inlet length of the oscillating flow is less than that of the steady flow and becomes shorter as the Womersley number alpha increases.
2. On the pulsating flow. The velocity distributions change rapidly with the phase at OMEGA=15-35゚ around the curved turn. The flow phenomena occurring in the entrance region of the curved pipes are too much complicated for an intermediate Womersley number alpha=10. The flow reversal occurs in the inner half cross-section of the curved pipe with OMEGA*15゚ and at phases with minimum flow rate for all values of alpha. And the depression in the axial velocity profile appears after the fouhth round in the curved pipe for alpha=10. The inlet length of pulsating flow is less than that of steady flow with the same flow rate as the maximum one in pulsating flow.

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] 角田 勝: "曲がり管内振動流に関する研究(第4報、入口付近の速度分布)" 日本機械学会論文集 B編. 60. 63-70 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 角田 勝: "誌上討論,曲がり管内振動流に関する研究(第4報,入口付近の速度分布)" 日本機械学会論文集 B編. 60. 3977 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 角田 勝: "曲がり管内振動流に関する研究(第4報,入口付近の速度分布)" 日本機械学会講演論文集No.930-63. 48-50 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 角田 勝: "曲がり管内振動流および脈動流の二次流れ" 日本伝熱学会、鳥取講演概要集. 70-76 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 角田 勝: "ゆるやかな曲がり管内の入口脈動流れ" 日本機械学会講演論文集No.955-1. (発表予定). (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 角田 勝: "曲がり管内脈動流に関する研究(入口付近の速度分布)" 日本機械学会講演論文集. (発表予定). (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 角田 勝: "曲がり管内振動流に関する研究(第5報,入口付近の速度分布)" 日本機械学会論文集 B編. 61(発表予定). (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Masaru SUMIDA: "Oscillatory Flow in Curved Pipes (4th Report, Velocity distribution in Entrance Region" Trans.Jpn Soc.Mech.Eng.60-569, B. 63-70 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Masaru SUMIDA: "Discussions on "scillatory Flow in Curved Pipes (4th Report, Velocity distribution in Entrance Region"" Trans.Jpn Soc.Mech.Eng.60-579, B. 3977 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Masaru SUMIDA: "Oscillatory Flow in Curved Pipes (4th Report, Velocity distribution in Entrance Region" Prepr.of Jpn Soc.Mech.Eng.No.930-63. 48-50 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Masaru SUMIDA: "Secondary Flow in Oscillting and Pulsating Flows in Curved Pipes" Prepr.Heat Transf.Soc.Jpn, (Tottori). 70-76 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Masaru SUMIDA: "Pulsating Entry Flow in a Weakly Curved Pipe" Prepr.of Jpn Soc.Mech.Eng.No.955-1. (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Masaru SUMIDA: "Pulsating Flow in Curved Pipes (Velocity Distribution in the Entrance Region)" Prepr.of Jpn Soc.Mech.Eng.(1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Masaru SUMIDA: "Pulsating Flow in Curved Pipes (5th Report, Velocity Distribution in the Entrance Region)" Trans.Jpn Soc.Mech.Eng.61, B. (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 角田 勝: "曲がり管内振動流および動脈流の二次流れ" 日本伝熱学会中四国伝熱セミナー・鳥取講演概要集. 70-76 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 角田 勝: "ゆるやかな曲がり管内の入口脈動流れ" 日本機械学会中国四国支部第33期総会 講演会講演論文集. (発表予定). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 角田 勝: "曲がり管内脈動流に関する研究(入口付近の速度分布)" 日本機械学会第72期通常総会講演会講演論文集. (発表予定). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 角田 勝: "曲がり管内振動流に関する研究(第4報,入口付近の速度分布)" 日本機械学会論文集 B編. 60巻569号. 63-70 (1994)

    • Related Report
      1993 Annual Research Report

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Published: 1993-04-01   Modified: 2016-04-21  

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