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

  • 제24권5호
  • /
  • Pages.699-708
  • /
  • 2000
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  • 1226-4881(pISSN)
  • /
  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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극세관 헬리컬 코일 증발관내 R-22의 열전달 및 압력손실 특성

Characteristics of Heat Transfer and Pressure Drop of R-22 Inside an Evaporating Tube with Small Diameter Helical Coil

  • 김주원 (부경대학교 대학원 냉동공학과) ;
  • 김정훈 (부경대학교 대학원 냉동공학과) ;
  • 서석기 (부경대학교 대학원 냉동공학과) ;
  • 김정훈 (부경대학교 해양산업개발연구소) ;
  • 김종수 (부경대학교 냉동공조공학과)
  • 발행 : 2000.05.01
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초록

To make compact evaporator, experiments that show characteristics of evaporating heat transfer and pressure drop in the helically coiled small diameter tube were taken in this research. The experiments were performed with HCFC-22 in the helically coiled small diameter tube; inner diameter=1.0(mm), tube length=2.0(m), and curvature diameter=31, 34, 46.2(mm). The experiments were also carried out with the following test conditions; saturation pressure=0.588(MPa), mass velocity=$150{\sim}500(kg/m^2s)$, and heat flux=$1{\sim}5(kW/m^2)$. The experiment results are that the empirical correlation to predict heat transfer coefficient for single phase flow in helically coiled small diameter tube was obtained. It was found that dry-out is occurred at low-quality region for evaporation heat transfer because of breaking of annular liquid film. The friction factor of single phase flow of helically coiled tube was agreed with Prandtl's correlation. Finally, It was proposed for correlation that can precisely predict the friction factor of two phase flow of helically coiled tube.

키워드

참고문헌

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