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MICRO-HEAT TRANSFER MECHANISM IN A BOUNDARY LAYER INDUCED BY ACOUSTIC OSCILLATION AND THE DEVELOPMENT OF THERMOACOUSTIC THEORY

Research Project

Project/Area Number 09650257
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Thermal engineering
Research InstitutionKANSAI UNIVERSITY

Principal Investigator

OZAWA Mamoru  KANSAI UNIVERSITY FACULTY OF ENGINEERING PROFESSOR, 工学部, 教授 (60112009)

Co-Investigator(Kenkyū-buntansha) UMEKAWA Hisashi  KANSAI UNIVERSITY FACULTY OF ENGINEERING ASSISTANT, 工学部, 助手 (10232894)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1998: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1997: ¥2,600,000 (Direct Cost: ¥2,600,000)
KeywordsAcoustic refrigerator / Temperature distribution along stack / Acoustic streaming / Heat transfer / Control of phase lag / Flow visualization / Osccillation boundary layer / スタック / 熱伝逹 / バイパス / 可視化
Research Abstract

It is well known that the boundary layer is formed by a sinusoidal oscillation. The thickness of this boundary layer (referred to as the depth of penetration) and thermal flow behavior there control the system performance of acoustic resonance-tube refrigerator. The scaling parameters of such heat transfer are derived based on the theoretical and numerical analysis as follows : the Prandtl number, the oscillation Reynolds number, the Strohal number with respect to the amplitude of fluid oscillation and the stack distance, the Strohal number with respect to the amplitude and the stack length and the heat capacity ratio of the stack and the fluid. Comparison between the experimental data of temperature distribution along the stack and the linearized thermoacoustic theory indicated a prime importance of the Strohal number. One of the important factors related to the Strohal. number is an acoustic streaming induced by the existence of fluid viscosity. Then the flow visualizing study was conducted to look insight into the influence of the stack on the streaming. The acoustic streaming showed characteristic feature that two vortices appeared at both sides of the stack and moreover that these two vortices were combined with each other by the through flow between them. This suggested the importance to take such vortices and through flow into account in the development of prediction model. Alternative approach to improve the performance is the control of the phase difference between the velocity and pressure fluctuation, and/or veloci es at both ends of the stack. One of the typical techniques is to install the by-pass between the acoustic driver and the closed end of the resonance tube. Then the by-pass with a resonance box has shown the potential to improve the performance.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] 小澤守: "音波で気体を冷却する(音響冷凍機の原理と研究の現状)" 超音波TECHNO. 9-6. 27-31 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 小澤守: "液体振動による熱輸送(ドリームパイプ)" 伝熱研究. 36-142. 46-52 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 河本明: "音響共鳴管内に置かれたスタックの温度分布(第2報,広範囲な系統的実験と支配パラメータの導出)" 日本機械学会論文集. 64-623. 2224-2231 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] A.Kawamoto: "Temperature Distribution in an Acoustic Resonance Tube : Discussion on Advanced linearized Theory" Heat Transfer-Japanese Research. 27-8. 551-567 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] A.Kawamoto: "Stack Temperature Distribution of Thermoacoustic Refrigerator Model" ISTP-10. 789-794 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Ozawa: "Flow Visualization of Acoustic Streaming in a Resonance Tube Refrigerator" Technology Reports of Kansai University. 41. 35-44 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Ozawa: "Cooling by Sound (Principles of Acoustic Refrigerator)" Ultra-Sonic Technology. 9-6. 27-31 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Ozawa: "Heat Transport by Sinusoidal Motion of Liquid (Dream Pipe)" J.Heat Transfer Society of Japan. 36-142. 46-52 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] A.Kawamoto, M.Ozawa and F.Arikawa: "Stack Temperature Distribution (2nd Report, Systematic Experiment and the Scaling Parameter)" Trans.JSME,Ser.B. 64-623. 2224-2231 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] A.Kawamoto, M.Ozawa and F.Arikawa: "Temperature Distribution in an Acoustic Resonance Tube : Discussion on Advanced Linearized Theory" Heat Transfer-Japanese Research. 27-8. 551-567 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] A.Kawamoto and M.Ozawa: "Stack Temperature Distribution of Thermoacoustic Refrigerator Model" Transport Phenomena in Thermal Science and Process Engineering (ISTP-10). Vol.3. 789-794 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Ozawa, K.Kunihiro and A.Kawamoto: "Flow Visualization of Acoustic Streaming in a Resonance Tube Refrigerator" Technology Reports of Kansai University. 41. 35-44 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 河本,明: "音響共鳴管内におかれたスタックの温度分布(第2報 広範囲な栄流的実験と支配パラメータの導出)" 日本機械学会論文集. 64-623. 2224-2231 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] A.Kawamoto: "Temparature Distribution Atong Stack in an Acoustic Resonance Tube:Discussion Advanced Linearized Theory" Heat Transfer-Japanese Research. 27-8. 551-567 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] M.Ozawa: "Flow Visualization of Acoustic Streaming in a Resonance Tube Refrigerator" Technology Reports of Kansai University. 41. 1-10 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 篠木,政利: "スターリング冷凍機における再生器の熱流動特性" 日本機械学会スターリングサイクルシンポジウム講座論文集. 98-19. 29-32 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 河本,明: "音響共鳴管内スタックの温度分布パターン" 日本機械学会スターリングサイクルシンポジウム講座論文集. 98-19. 33-36 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] A.Kawamoto: "Stack Tomperature Distribution of Thermoacauotic Refrigerator Model" Transport Phenomena in Thaermal Science and Procass Engineary. Vol.3. 789-794 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 河本,明: "音響共鳴管内に置かれたスタックの温度分布(広範囲な系統的実験と支配パラメータの導出)" 日本機械学会論文集. (掲載決定). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 小澤,守: "往復振動流の熱伝達特性とスケーリングパラメータ" 日本機械学会第1回スターリングサイクルシンポジウム講演論文集. 111-113 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 國廣,賢治: "スタックを有する共鳴管内音響流の可視化" 日本伝熱シンポジウム講演論文集. (発表予定). (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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