• 제목/요약/키워드: vapor condensation

검색결과 251건 처리시간 0.051초

Nucleation Theory

  • 곽호영
    • 기계저널
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    • 제22권1호
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    • pp.34-39
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    • 1982
  • 본 해설에서는 nucleation현상의 한 예로 과포화상태에 있는 증기 (vapor)의 응축과 정(condensation)을 중심으로 설명하고자 한다. 제 2절에서는 nucleation 현상의 예와 그 응용에 대해서 설명하기로 하고 제 3절에서는 열역학적인 면에서 제 4절은 운동론적인 면에서 제 5절은 nucleation theory의 문제점에 관해 고찰해 보려 한다.

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관표면에서의 곡면응축막의 열전달 (Condensation Heat Transfer to Rivulets of Condensate on Horizontal tubes)

  • 배순훈;최영순
    • 대한설비공학회지:설비저널
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    • 제4권1호
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    • pp.18-22
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    • 1975
  • A simple analysis has been made of the condensation of vapor onto rivulets of condensate which are formed by non-wetting narrow Taflon strips circumferencially located in a certain interval on horizontal tubes. Heat transfer to the rivulets increased over $50\%$ above that to the Nusselt uniform thickness film. Results are directly applicable to condenser tubes in large steam condensers.

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열전달 촉진관에서 HFC32/HFC152a 혼합냉매의 외부 응축열전달계수 (External Condensation Heat Transfer Coefficients of HFC32/HFC152a Mixtures on Enhanced Tubes)

  • 이요한;강동규;김현주;이호생;정동수
    • 설비공학논문집
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    • 제26권7호
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    • pp.315-321
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    • 2014
  • In this study, external condensation heat transfer coefficients (HTCs) of two non-azeotropic refrigerant mixtures of HFC32/HFC152a at various compositions were measured on both 26 fpi low-fin and Turbo-C enhanced tubes, of 19.0 mm outside diameter. All data were taken at the vapor temperature of $39^{\circ}C$, with a wall subcooling of 3~8 K. Test results showed that the HTCs of the tested mixtures on the enhanced tubes were much lower than the ideal values calculated by mass fraction weighting of the pure component HTCs. Also, the reduction of HTCs due to the diffusion vapor film was much larger than that of a plain tube. Unlike HTCs of pure fluids, HTCs of the mixtures measured on enhanced tubes increased, as the wall subcooling increased, which was due to the sudden break-up of the vapor diffusion film with an increase in wall subcooling. Finally, the heat transfer enhancement ratios for mixtures were found to be much lower, than those of pure fluids.