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Study on the control of longitudinal dispersion in oscillatory flows in pipes and on the presentation method of its phenomena

Research Project

Project/Area Number 10650173
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionOsaka University

Principal Investigator

INABA Takehiko  department of mechanophysics engineering Osaka university, professor, 大学院・工学研究科, 教授 (00029307)

Co-Investigator(Kenkyū-buntansha) SAITOH Ken-ichi  department of mechanophysics engineering Osaka university, research associate, 大学院・工学研究科, 助手 (90294032)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1999: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1998: ¥2,100,000 (Direct Cost: ¥2,100,000)
Keywordspipe flow / oscillatory flow / heat transfer enhancement / pipe bundles / pipe with wavy wall / phase lag
Research Abstract

Longitudinal heat transfer between two fluid reservoirs of different temperature is highly enhanced by fluid pulsation in capillary pipes that connect the reservoirs. The heat transfer is known to be proportional to the product of the longitudinal temperature gradient and the square of the pulsating fluid displacement from analyses for single circular pipes. Pipe bundles are used in practical applications to obtain a sufficient amount of heat transfer. There exist spaces between each three pipes in circular pipe bundles, which deteriorate the heat transfer characteristics. To avoid this disadvantage, pipes of triangular, square and hexagonal section as well as of circular on were considered. Although the triangular pipe showed the best heat transfer characteristics as a single pipe, it was cleared that the wall thickness and its heat conduction coefficient were important parameters to determine the performance as pipe bundles from the analysis under the conditions of the same cross sec … More tional area, wall thickness and fluid pulsation amplitude. The effect of wavy wall was also investigated changing the wave number of the wavy wall, its amplitude and the fluid pulsation frequency and amplitude. The heat transfer was enhanced with the amplitude of the wall waviness. The wavy wall pipes were superior to smooth ones in dynamic response of heat transfer controled by fluid pulsation amplitude and frequency.
The mechanism of the heat transfer of this apparatus was investigated closely. We found a region where heat was transferred toward higher temperature end and this occurred in the region where the phase lag between the pulsations of fluid and temperature exceeded π/2. Then visualization methods have been investigated to explain these unseen phenomena to nonexperts including students as well as experts. It was found effective that each image should contain limited informations presented by primitive variables. The phase difference between the pulsations of fluid and temperature was most effectively presented by animations using wire frame model of different colors. The heat flow was obtained quantitatively solving the governing equations and expressed by the motion of virtual particles which represented enthalpy. The lateral motion of the particles was very subtle unlike the impressions given by the conventional qualitative explanation of the mechanism. The visualization method successfully showed that the small lateral motion of heat flow resulted in a significant enhancement of longitudinal heat transfer. Less

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] 稲葉武彦: "科学データの可視化に関する一考察-半透明表示の効用-"日本図学会1998年度本部例会講演会資料. 1-4 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 若松洋: "流体脈動による軸方向拡散に及ぼす波状壁の影響"日本機械学会講演論文集(関西支部第74期定時総会講演会). No.994-1. 4-39-4-40 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 渡邉智也: "管内脈動流による長手方向熱拡散促進-管端付近の挙動-"日本機械学会講演論文集(関西支部第74期定時総会講演会). No.994-1. 4-41-4-42 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 稲葉武彦: "管束内脈動流による軸方向熱拡散に及ぼす管断面形状の影響"日本機械学会論文集B編. 65巻・636号. 2821-2827 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 柿本隆: "流体脈動による熱拡散現象の表示法に関する研究"日本機械学会第12回計算力学講演会講演論文集. No.9-5. 593-594 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T. Inaba: "Longitudinal Heat Transfer in Oscillatory Flows in Pipe Bundles of Various Cross Sections"JSME International Journal. (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T. Inaba: "A Consideration on the Visualization of Scientific Data-Effectiveness of Semitramsparancy in Presentation-"Preprint of 1998 Annual Meeting of the Japan Society for Graphic Sci-ence. 1-4 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H. Wakamatsu: "Effect of Wavy Pipe Wall on Longitudinal D-iffusion in Oscillatory Pipe Flow"Proceedings of JSME. No.994-1. (4-) 39-40 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T. Watanabe: "Enhanced Longitudinal Thermal Diffusion in Oscillatory Pipe Flow -Behavior near a Pipe End-"Proceedings of JSME. No.994-1. (4-) 41-42 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T. Inaba: "The Effect of the Pipe Cross-sectional Shape on the Longitudinal Heat Transfer in Oscillatory Flows in Pipe Bundles"Trans. JSME, Ser. B. 65-636. 2821-2827 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T. Kakimoto: "Study on the Presentation Method of the Mech-anism of Longitudinal Thermal Diffusion in Oscillatroy Flows in Pipes"Proceedings of JSME. No.99-5. 593-594 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T. Inaba: "Longitudinal Heat Transfer in Oscillatory Flows in Pipe Bundles of Various Cross Sections"JSME International Journal. (in print). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 稲葉 武彦: "管束内脈動流による軸方向熱拡散に及ぼす管断面形状の影響"日本機械学会論文集B編. 65巻・636号. 2821-2827 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 柿本 隆: "流体脈動による熱拡散現象の表示法に関する研究"日本機械学会第12回計算力学講演会講演論文集. No.99-5. 593-594 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.Inaba: "Longitudinal Heat Transfer in Oscillatory Flows in Pipe Bundles of Various Cross Section"JSME International Journal. (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] 稲葉 武彦: "科学データの可視化に関する一考察 -半透明表示の効用-" 日本図学会1998年度本部例会講演会資料. 1-4 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 若松 洋: "流体脈動による軸方向拡散に及ぼす波状壁の影響" 日本機械学会関西支部第74期定常総会講演会講演論文集. (1999)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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