Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Numerical Study of the Inertia Effect on Flow Distribution in Micro-gap Plate Heat Exchanger

유동관성에 따른 Micro-Gap 판형 열교환기 내부 유동분배 수치해석

  • Park, Jang Min (School of Mechanical Engineering, Yeungnam Univ.) ;
  • Yoon, Seok Ho (Dept. of Extreme Thermal Systems, Korea Institute of Machinery and Materials) ;
  • Lee, Kong Hoon (Dept. of Extreme Thermal Systems, Korea Institute of Machinery and Materials) ;
  • Song, Chan Ho (Dept. of Extreme Thermal Systems, Korea Institute of Machinery and Materials)
  • 박장민 (영남대학교 기계공학부) ;
  • 윤석호 (한국기계연구원 열공정극한기술연구실) ;
  • 이공훈 (한국기계연구원 열공정극한기술연구실) ;
  • 송찬호 (한국기계연구원 열공정극한기술연구실)
  • Received : 2014.05.19
  • Accepted : 2014.08.25
  • Published : 2014.11.01
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Abstract

This paper presents numerical study on flow and heat transfer characteristics in micro-gap plate heat exchanger. In particular, we investigate the effect of flow inertia on the flow distribution from single main channel to multiple parallel micro-gaps. The flow regime of the main channel is varied from laminar regime (Reynolds number of 100) to turbulent regime (Reynolds number of 10000) by changing the flow rate, and non-uniformity of the flow distribution and temperature field is evaluated quantitatively based on the standard deviation. The flow distribution is found to be significantly affected by not only the header design but also the flow rate of the main channel. It is also observed that the non-uniformity of the temperature field has its maximum at the intermediate flow regime.

본 연구에서는 micro-gap 판형 열교환기 내부의 열유동 특성에 대한 수치해석을 수행하였다. 특히 유량 조건에 따라 열교환기의 주 채널로부터 각 micro-gap 으로의 유동분배에 대한 유동관성의 영향에 대하여 조사하였다. 열교환기 주 채널의 유동을 레이놀즈 수 100 부터 10000 까지 변화시키며 그에 따른 각 micro-gap 으로의 유동분배와 온도분포의 불균일 정도를 평가하였다. 수치해석 결과 유동분배는 유동관성에 의해 크게 영향을 받는 것으로 나타났으며, 관성 효과를 감소시킬 수 있는 헤더 설계를 통해 유동분배 불균일 정도를 줄일 수 있었다. 또한 micro-gap 을 통과한 유체의 온도분포의 불균일 정도는 주유량이 증가함에 따라 증가 후 감소 추세를 나타냈다.

Keywords

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