The KSFM Journal of Fluid Machinery (한국유체기계학회 논문집)

Korean Society for Fluid machinery (한국유체기계학회)
권호 표지
DOI QR코드

DOI QR Code

Laminar Film Condensation Model of Pure Steam in a Vertical Tube

수직관 내 순수 증기의 층류 액막 응축 모델

  • Kim, Dong Eok (Dept. of Precision Mechanical Engineering, Kyungpook National University)
  • 김동억 (경북대학교 정밀기계공학과)
  • Received : 2014.03.26
  • Accepted : 2014.05.15
  • Published : 2014.06.01
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, a new model for calculating the liquid film thickness and condensation heat transfer coefficient in a vertical condenser tube is proposed by considering the effects of gravity, liquid viscosity, and vapor flow in the core region of the flow. In order to introduce the radial velocity profile in the liquid film, the liquid film flow was regarded to be in Couette flow dragged by the interfacial velocity at the liquid-vapor interface. For the calculation of the interfacial velocity, an empirical power-law velocity profile had been introduced. The resulting liquid film thickness and heat transfer coefficient obtained from the proposed model were compared with the experimental data from other experimental study and the results obtained from the other condensation models. In conclusion, the proposed model physically explained the liquid film thinning effect by the vapor shear flow and predicted the condensation heat transfer coefficient from experiments reasonably well.

Keywords

References

  1. W. Nusselt, 'Die ober achenkondensation des wasserdampfes-the surface condensation of water' Zeitschrift Vereines Deutscher Ingenieure, 27, 541-546(1916).
  2. W. M. Rohsenow, J. H. Webber and A. T. Ling, 'Effect of vapour velocity on laminar and turbulent film condensation' Trans. ASME, 78, 1637-1643(1956).
  3. W. H. McAdams, "Heat transmission 3rd ed.", McGraw-Hill, New York(1954).
  4. F. Dobran and R. S. Thorsen, 'Forced flow laminar filmwise condensation of a pure saturated vapor in a vertical tube' Int. J. Heat Mass Transfer, 23, 161-177(1980). https://doi.org/10.1016/0017-9310(80)90194-5
  5. F. Blangetti and M. K. Naushahi, 'Influence of mass transfer on the momentum transfer in condensation and evaporation phenomena' Int. J. Heat Mass Transfer, 23, 1694-1695(1980). https://doi.org/10.1016/0017-9310(80)90231-8
  6. A. Nakayama and H. Koyama, 'An integral procedure for a two-phase boundary layer in laminar film condensation' Int. J. Multiphase Flow, 12, 135-144(1986). https://doi.org/10.1016/0301-9322(86)90009-1
  7. S. L. Chen and M. T. Ke, 'Forced convective film condensation inside vertical tubes' Int. J. Multiphase Flow, 19, 1045-1060(1993). https://doi.org/10.1016/0301-9322(93)90077-8
  8. J. H. Goodykoontz and R. G. Dorsch, 'Local heat-transfer coefficients for condensation of steam in vertical down flow with 5/8 in. diameter tube' Report NASA TN, D3326(1966).
  9. J. H. Goodykoontz and R. G. Dorsch, 'Local heat-transfer coefficients and static pressures for condensation of high velocity steam within a tube' Report NASA TN, D3953(1967).
  10. S. Z. Kuhn, V. E. Schrock and P. F. Peterson, 'An investigation of condensation from steam-gas mixtures flowing downward inside a vertical tube' Nuc. Eng. Des., 177, 53-69(1997). https://doi.org/10.1016/S0029-5493(97)00185-4
  11. P. K. Panday, 'Two-dimensional turbulent film condensation of vapours flowing inside a vertical tube and between parallel plates: a numerical approach' Int. J. Refrigeration, 26, 492-503(2003). https://doi.org/10.1016/S0140-7007(02)00162-7
  12. S. Oh and S. T. Revankar, 'Analysis of the complete condensation in a vertical tube passive condenser' Int. Comm. Heat Mass Transfer, 32, 716-727(2005). https://doi.org/10.1016/j.icheatmasstransfer.2004.10.013
  13. K. Y. Lee, 'The effects of noncondensable gas on steam condensation in a vertical tube of Passive Residual Heat Removal System' Ph. D. Thesis., POSTECH, Korea(2008).
  14. W. J. Minkowycz and E. M. Sparrow, 'Condensation heat transfer in the presence of noncondensabls, interfacial resistance, superheating, variable properties and diffusion' Int. J. Heat Mass Transfer, 9, 1125-1144(1966). https://doi.org/10.1016/0017-9310(66)90035-4
  15. B. R. Munson, D. F. Young and T. H. Okiishi, "Fundamentals of fluid mechanics 4th ed.", John Wiley & Sons, New York(2002).

Cited by

  1. 2014년 유체공학일반 분야 연구동향 vol.18, pp.2, 2014, https://doi.org/10.5293/kfma.2015.18.2.096