Journal of computational fluids engineering (한국전산유체공학회지)

Korean Society of Computational Fluids Engineering (한국전산유체공학회)
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NUMERICAL STUDY OF THE HIGH-SPEED BYPASS EFFECT ON THE AERO-THERMAL PERFORMANCE OF A PLATE-FIN TYPE HEAT EXCHANGER

평판-휜 열교환기의 열-수력학적 성능에 대한 고속 바이패스 영향의 수치적 연구

  • Lee, Jun Seok (School of Mechanical Engineering, Pusan National University) ;
  • Kim, Minsung (School of Mechanical Engineering, Pusan National University) ;
  • Ha, Man Yeong (School of Mechanical Engineering, Pusan National University) ;
  • Min, June Kee (School of Mechanical Engineering, Pusan National University)
  • Received : 2017.02.13
  • Accepted : 2017.03.20
  • Published : 2017.03.31
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Abstract

The high-speed bypass effect on the heat exchanger performance has been investigated numerically. The plate-fin type heat exchanger was modeled using two-dimensional porous approximation for the fin region. Governing equations of mass, momentum, and energy equations for compressible turbulent flow were solved using ideal-gas assumption for the air flow. Various bypass-channel height were considered for Mach numbers ranging 0.25-0.65. Due to the existence of the fin in the bypass channel, the main flow tends to turn into the core region of the channel, which results in the distorted velocity profile downstream of the fin region. The boundary layer thickness, displacement thickness, and the momentum thickness showed the variation of mass flow through the fin region. The mass flow variation along the fin region was also shown for various bypass heights and Mach numbers. The volumetric entropy generation was used to assess the loss mechanism inside the bypass duct and the fin region. Finally, the correlations of the friction factor and the Colburn j-factor are summarized.

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References

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