International Journal of Energy and Power Engineering

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Study on the Experiments and the Numerical Analysis of Exchange Flow Behavior in the Unstably Stratified Field

Received: 27 May 2015    Accepted: 7 June 2015    Published: 19 June 2015
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Abstract

In the flow mechanism of unstably stratified field, occurs after Rayleigh-Taylor instability. Buoyancy-driven exchange flows were investigated the helium-air flow in the vertical narrow pathway between upper air chamber and lower helium chamber. Exchange flows may occur following the opening of a window for ventilation, when fire breaks out in a room, as well as when a pipe ruptures in a high temperature gas-cooled nuclear reactor. The numerical analysis and experiment in this paper was carried out in a test chamber filled with helium and the flow was visualized using the smoke wire method. The flow behavior was recorded by a high-speed camera combined with a computer system. The image of the flow was transferred to digital data, and the flow velocity was measured by PTV and PIV software. The mass fraction in the test chamber was measured using electronic balance. The detected data was arranged by the densimetric Froude number of the exchange flow rate derived from the dimensional analysis. A method of mass increment was developed and applied to measure the exchange flow rate. As the result, it is revealed that three dimensional structure of counter current exchange flow in the narrow flow path such as rotation and circulation flows by the optical system, mass inclement method and numerical analysis of moving particle method as well as HSMAC method.

DOI 10.11648/j.ijepe.20150403.16
Published in International Journal of Energy and Power Engineering (Volume 4, Issue 3, June 2015)
Page(s) 178-183
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Buoyancy, Exchange Flow, Helium, Moving Particle Method, Clockwise Flow

References
[1] Fumizawa,M.; Nuclear Reactors (ISBN 978-953-51-0018-8) , Edited by Amir Zacarias Mesquita, InTech, pp.47-56 (2012)
[2] Fumizawa,M.; Proc. HT2005 ASME Summer Heat Transfer Conference, HT2005 -72131, Track 1-7-1 , pp.1-7 (2005).
[3] Fumizawa,M.;Nuclear Reactors (ISBN 978-953-51-0967-9) , Edited by Amir Zacarias Mesquita, InTech, pp.177-191 (2013)
[4] M.M.El-Wakil, Nuclear Energy Conversion, Thomas Y. Crowell Company Inc., USA (1982)
[5] Epstein,M., Trans. ASME J. Heat Transfer, pp.885 -893 (1988)
[6] Mercer, A. and Thompson.H., J. Br. Nucl. Energy Soc., 14, pp.327-340 (1975),
[7] Kang,T. et al., NURETH-5, pp.541-546 (1992)
[8] Merzkirch.W., "Flow Visualization”, Academic Press (1974)
[9] Feng,J. et al., Chemical Engineering Journal, Volume 86, pp.243-250 (2002)
[10] Prometech software web-site, http://www.prometech.co.jp/ (2015)
[11] Keulegan, G. H., U. S. N. B. S. Report 5831 (1958)
[12] Fumizawa,M. et. al., J. At. Energy Soc. Japan, Vol.31, pp.1127-1128 (1989)
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  • APA Style

    Motoo Fumizawa, Yoshiharu Saito, Naoya Uchiyama, Takahiro Nakayama. (2015). Study on the Experiments and the Numerical Analysis of Exchange Flow Behavior in the Unstably Stratified Field. International Journal of Energy and Power Engineering, 4(3), 178-183. https://doi.org/10.11648/j.ijepe.20150403.16

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    ACS Style

    Motoo Fumizawa; Yoshiharu Saito; Naoya Uchiyama; Takahiro Nakayama. Study on the Experiments and the Numerical Analysis of Exchange Flow Behavior in the Unstably Stratified Field. Int. J. Energy Power Eng. 2015, 4(3), 178-183. doi: 10.11648/j.ijepe.20150403.16

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    AMA Style

    Motoo Fumizawa, Yoshiharu Saito, Naoya Uchiyama, Takahiro Nakayama. Study on the Experiments and the Numerical Analysis of Exchange Flow Behavior in the Unstably Stratified Field. Int J Energy Power Eng. 2015;4(3):178-183. doi: 10.11648/j.ijepe.20150403.16

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  • @article{10.11648/j.ijepe.20150403.16,
      author = {Motoo Fumizawa and Yoshiharu Saito and Naoya Uchiyama and Takahiro Nakayama},
      title = {Study on the Experiments and the Numerical Analysis of Exchange Flow Behavior in the Unstably Stratified Field},
      journal = {International Journal of Energy and Power Engineering},
      volume = {4},
      number = {3},
      pages = {178-183},
      doi = {10.11648/j.ijepe.20150403.16},
      url = {https://doi.org/10.11648/j.ijepe.20150403.16},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijepe.20150403.16},
      abstract = {In the flow mechanism of unstably stratified field, occurs after Rayleigh-Taylor instability. Buoyancy-driven exchange flows were investigated the helium-air flow in the vertical narrow pathway between upper air chamber and lower helium chamber. Exchange flows may occur following the opening of a window for ventilation, when fire breaks out in a room, as well as when a pipe ruptures in a high temperature gas-cooled nuclear reactor. The numerical analysis and experiment in this paper was carried out in a test chamber filled with helium and the flow was visualized using the smoke wire method. The flow behavior was recorded by a high-speed camera combined with a computer system. The image of the flow was transferred to digital data, and the flow velocity was measured by PTV and PIV software. The mass fraction in the test chamber was measured using electronic balance. The detected data was arranged by the densimetric Froude number of the exchange flow rate derived from the dimensional analysis. A method of mass increment was developed and applied to measure the exchange flow rate. As the result, it is revealed that three dimensional structure of counter current exchange flow in the narrow flow path such as rotation and circulation flows by the optical system, mass inclement method and numerical analysis of moving particle method as well as HSMAC method.},
     year = {2015}
    }
    

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  • TY  - JOUR
    T1  - Study on the Experiments and the Numerical Analysis of Exchange Flow Behavior in the Unstably Stratified Field
    AU  - Motoo Fumizawa
    AU  - Yoshiharu Saito
    AU  - Naoya Uchiyama
    AU  - Takahiro Nakayama
    Y1  - 2015/06/19
    PY  - 2015
    N1  - https://doi.org/10.11648/j.ijepe.20150403.16
    DO  - 10.11648/j.ijepe.20150403.16
    T2  - International Journal of Energy and Power Engineering
    JF  - International Journal of Energy and Power Engineering
    JO  - International Journal of Energy and Power Engineering
    SP  - 178
    EP  - 183
    PB  - Science Publishing Group
    SN  - 2326-960X
    UR  - https://doi.org/10.11648/j.ijepe.20150403.16
    AB  - In the flow mechanism of unstably stratified field, occurs after Rayleigh-Taylor instability. Buoyancy-driven exchange flows were investigated the helium-air flow in the vertical narrow pathway between upper air chamber and lower helium chamber. Exchange flows may occur following the opening of a window for ventilation, when fire breaks out in a room, as well as when a pipe ruptures in a high temperature gas-cooled nuclear reactor. The numerical analysis and experiment in this paper was carried out in a test chamber filled with helium and the flow was visualized using the smoke wire method. The flow behavior was recorded by a high-speed camera combined with a computer system. The image of the flow was transferred to digital data, and the flow velocity was measured by PTV and PIV software. The mass fraction in the test chamber was measured using electronic balance. The detected data was arranged by the densimetric Froude number of the exchange flow rate derived from the dimensional analysis. A method of mass increment was developed and applied to measure the exchange flow rate. As the result, it is revealed that three dimensional structure of counter current exchange flow in the narrow flow path such as rotation and circulation flows by the optical system, mass inclement method and numerical analysis of moving particle method as well as HSMAC method.
    VL  - 4
    IS  - 3
    ER  - 

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Author Information
  • Department of Mechanical Engineering, Shonan Institute of Technology Fujisawa, Kanagawa, Japan

  • Department of Mechanical Engineering, Shonan Institute of Technology Fujisawa, Kanagawa, Japan

  • Department of Mechanical Engineering, Shonan Institute of Technology Fujisawa, Kanagawa, Japan

  • Department of Mechanical Engineering, Shonan Institute of Technology Fujisawa, Kanagawa, Japan

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