Study on the Experiments and the Numerical Analysis of Exchange Flow Behavior in the Unstably Stratified Field
International Journal of Energy and Power Engineering
Volume 4, Issue 3, June 2015, Pages: 178-183
Received: May 27, 2015; Accepted: Jun. 7, 2015; Published: Jun. 19, 2015
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Authors
Motoo Fumizawa, Department of Mechanical Engineering, Shonan Institute of Technology Fujisawa, Kanagawa, Japan
Yoshiharu Saito, Department of Mechanical Engineering, Shonan Institute of Technology Fujisawa, Kanagawa, Japan
Naoya Uchiyama, Department of Mechanical Engineering, Shonan Institute of Technology Fujisawa, Kanagawa, Japan
Takahiro Nakayama, Department of Mechanical Engineering, Shonan Institute of Technology Fujisawa, Kanagawa, Japan
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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.
Keywords
Buoyancy, Exchange Flow, Helium, Moving Particle Method, Clockwise Flow
To cite this article
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, International Journal of Energy and Power Engineering. Vol. 4, No. 3, 2015, pp. 178-183. doi: 10.11648/j.ijepe.20150403.16
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