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

The Korean Society of Mechanical Engineers (대한기계학회)
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A modeling of in-tube condensation heat transfer considering liquid entrainment

액적이탈을 고려한 관내 응축열전달계수 계산 모델

  • Kwon, Jeongtae (Dept. of Mechanical Engineering, Graduate School of Pohang University of Science and Technology) ;
  • Ahn, Yehchan (Dept. of Mechanical Engineering, Graduate School of Pohang University of Science and Technology) ;
  • Kim, Moohwan
  • 권정태 (포항공과대학교 대학원 기계공학과) ;
  • 안예찬 (포항공과대학교 대학원 기계공학과) ;
  • 김무환 (포항공과대학교 기계공학과)
  • Published : 1998.07.01
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Abstract

Local condensation heat transfer coefficients in tubes were calculated by solving momentum and energy equations for annular film with liquid entrainment. The turbulent eddy distribution across the liquid film has been proposed and the calculated heat transfer coefficients were presented. Also turbulent Prandtl number effects on condensation heat transfer were discussed from three Pr$\_$t/ models. Finally, the calculated condensation heat transfer coefficients of R22 were compared with some correlations frequency referred to in open literature. This calculation model considering liquid entrainment predicted well the in-tube condensation heat transfer coefficient of R22 than the model not considering liquid entrainment. The effect of entrainment on heat transfer was predominant for high quality and high mass flux when the liquid film was turbulent.

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