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

  • 제24권2호
  • /
  • Pages.241-250
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  • 2000
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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알루미늄 다채널 평판관내 R-22 응축에 관한 연구

R-22 Condensation in Flat Aluminum Multi-Channel Tubes

  • 김정오 (인천대학교 대학원 기계공학과) ;
  • 조진표 (인천대학교 기계공학과) ;
  • 김내현 (인천대학교 기계공학과)
  • 발행 : 2000.02.01
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초록

In this study, condensation heat transfer tests were conducted in flat aluminum multi-channel tubes using R-22. Two internal geometries were tested ; one with smooth inner surface and the other with micro-fins. Data are presented for the followin~ range of variables ; vapor quality($0.1{\sim}0.9$), mass flux($200{\sim}600kg/m^2s$) and heat flux($5{\sim}15kW/m^2$). The micro-fin tube showed higher heat transfer coefficients compared with those of the smooth tube. The difference increased as the vapor quality increased. Surface tension force acting on the micro-fin surface at the high vapor quality is believed to be responsible. Different from the trends of the smooth tube, where the heat transfer coefficient increased as the mass flux increased, the heat transfer coefficient of the micro-fin tube was independent of the mass flux at high vapor quality, which implies that the surface tension effect on the fin overwhelms the vapor shear effect at the high vapor quality. Present data(except those at low mass flux and high quality) were well correlated by equivalent Reynolds number, Existing correlations overpredicted the present data at high mass flux.

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참고문헌

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