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The Effect of Non-condensable Gas on Direct Contact Condensation of Steam/Air Mixture 원문보기

Journal of the Korean Nuclear Society = 원자력학회지, v.33 no.6, 2001년, pp.585 - 595  

Lee, Hanchoon (Pohang University) ,  Kim, Moohwan (Pohang University) ,  Park, Suki (Korea Electric Power Research Institute)

Abstract ▼ AI-Helper 아이콘AI-Helper

A series of experiments have been carried out to investigate the effects of non-condensable gas on the direct contact film condensation of vapor mixture under an adiabatic wall condition. The average heat transfer coefficient of the direct contact condensation was obtained at the atmospheric pressur...

주제어

#direct contact condensation   #film condensation   #non-condensable gas   #steam/air mixture  

AI 본문요약
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제안 방법

  • In the present study, experiments for condensation of the steam/air mixture into the water film on the nearly vertical wall (87°) were carried out. The air mass fraction, the velocity of the mixture, the water film flow rate, and the film subcooling at the inlet were selected as the experimental parameters affecting the direct contact condensation heat transfer coefficients. The average Nusselt members were correlated with the water film Reynolds number, mixture Reynolds number, air mass fraction of mixture and Jacob number.
  • [7] studied condensation of steam on subcooled water in a concurrent horizontal channel. They obtained the local heat transfer coefficients by measuring the velocity profile of pure steam and calculating the condensing mass flow rate. Their experimental correlation showed that the film Reynolds number is more dominant than the vapor Reynolds number for the heat transfer coefficients.
  • Most of the previous researches on condensation were interested in the heat transfer through the wall with condensation. This study was carried out to analyze the direct contact condensation from the mixture to the water film on the adiabatic wall without heat discharging through the condensing wall. In the present study, experiments for condensation of the steam/air mixture into the water film on the nearly vertical wall (87°) were carried out.

대상 데이터

  • Experimental apparat나s is composed of a test section and facilities supplying water film, air, and steam. A schematic diagram is shown in Fig.
  • 2 shows the side view of the test section. The total length of the test section is 1, 750 mm, and the size of the part at which condensation heat transfer occurs is 150W x 100D x 1510Lmm3. Experiments were carried out on condensation of external mixture flow for a vertical flat plate.

이론/모형

  • A transport property of mixture like viscosity (I丄mix) was calculated by the method of Wilke [10].
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참고문헌 (10)

  1. W. M. Rohsenow, 'Heat Transfer and Temperature Distribution in Laminar-Film Condensation,' J. Heat Transfer, 78, pp. 1645-1648 (1956) 

  2. W. M. Rohsenow, J. H. Webber, and A. T. Ling, 'Effect of Vapor Velocity on Laminar and Turbulent-film Condensation,' J. Heat Transfer, 78, pp. 1637-1643 (1956) 

  3. H. C. Kang and M. H. Kim, 'Measurement of Three-dimensional Wave Form and Interfacial Area in an Air-Water Stratified Flow,' Nuclear Eng. and Design, 136, pp. 347-360 (1992) 

    상세보기 crossref

  4. S. K. Park, Effects of Wavy interface on Film Condensation of Steam/Air Mixture on a Vertical Surface, Ph. D. dissertation, Pohang University of Science and Technology (POSTECH) (1996) 

  5. H. J. Kim and S. G. Bankoff, 'Local Heat Transfer coefficients for Condensation in Stratified Countercurrent Steam-Water Flows,' J. Heat. Transfer, 105, pp. 706-712 (1983) 

  6. H. J. Kim, S. C. Lee, and S. G. Bankoff, 'Heat Transfer and Interfacial Drag in Countercurrent Steam-Water Stratified Flow,' Int. J. Multiphase Flow,' 11, 5, pp. 593-606 (1985) 

    상세보기 crossref

  7. I. S. Lim, R. S. Tankin, and M. C. Yuen, 'Condensation Measurement of Horizontal Cocurrent Steam/Water Flow,' J. Heat. Transfer, 106, pp. 425-432 (1984) 

  8. T. S. Chan and M. C. Yuen, 'The Effects of Air on Condensation of Stratified Horizontal Concurrent Steam/Water Flow,' J. Heat. Transfer, 112, pp. 1092-1095 (1990) 

  9. H. W. Coleman and W. G. steele Jr., Experimentation and Uncertainty Analysis for Engineers, John Wiley & sons inc., NewYork (1989) 

  10. R. C. Reid, J. M. Prausnitz, and B. E. Poling, The properties of gas & liquids, 4th Ed., McGraw-Hill, pp. 407-410 (1986) 

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