Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
권호 표지

Interfacial Condensation Heat Transfer for Countercurrent Steam-Water Stratified Flow in a Circular Pipe

  • Published : 2000.04.01
Download PDF
⟨ Previous Next ⟩

Abstract

An experimental study of steam condensation on a subcooled thick water layer (0.018 ~0.032 m) in a countercurrent stratified flow has been performed using a nearly horizontal circular pipe. A total of 103 average interfacial condensation heat transfer coefficients were obtained and parametric effects of steam and water flow rates and the degree of subcooling on condensation heat transfer were examined. The measured local temperature and velocity distributions in the thick water layer revealed that there was a thermal stratification due to the lack of full turbulent thermal mixing in the lower region of the water layer Two empirical Nusselt number correlations, one in terms of average steam and water Reynolds numbers, and the water Prandtl number, and the other in terms of the Jakob number in place of the Prandtl number, which agree with most of the data within $\pm$ 25%, were developed based on the bulk flow properties. Comparisons of the present data with existing correlations showed that the present data were significantly lower than the values predicted by existing correlations.

Keywords

References

  1. Kim, H. J. and Bankoff, S. G., 'Local heat transfer coefficients for condensation in strarified countercurrent steam-water flows,' J. Heat Transfer Trans. ASME, 105, 706-712 (1983)
  2. Kim. H. J., Lee, S. C., and Bankoff, S. G., 'Heat tranfrer and interfacial drag in countercurrent steam-water stratified flow,' Int. J. Multiphase Flow, 11, 593-606 (1985) https://doi.org/10.1016/0301-9322(85)90081-3
  3. Lim, I. S., Tankin, R. S., and Yuen, M. C., 'Condensation measurement of horizontal cocurrent steam/water flow,' J. Heat Transfer.Trans. ASME, 106, 425-432 (1984)
  4. Kline, S. J. and McClintock, F. A., 'Describing uncertainties in single-sample experiments,' Mechanical Engineering, 75, 3-8 (1953)
  5. Linehan, J. H., Petrick, M., and El-Wakil, M. M., 'The condensation of a saturated vapor on a subcooled film during stratified flow,' Chem. Eng. Prog. Symp. Series, 66, 11-20 (1970)
  6. Mandhane, J. M., Gregory G. A., and Aziz, K., 'A flow pattern map for gas-liquid flow in horizontal pipes,' int. J. Multiphase Flow, 1, 537-553 (1974) https://doi.org/10.1016/0301-9322(74)90006-8
  7. Moffat. R. J., 'Describing uncertainties in experimental results,' Experimental thermal and Fluid Science, 1, 3-17 (1988) https://doi.org/10.1016/0894-1777(88)90043-X
  8. Ruile, H., 'Heat transfer by direct contact condensation in stratified two phase flow at high system pressure,' Two-Phase Flow Modeling and Experimentation, 269-276 (1995)
  9. Segev, A., Flanigan, L. J., Kurth, R. E., and Coillier, R. P., 'Experimental study of countercurrent steam condensation,' J. Heat Transfer Trans. ASME, 103, 307-311 (1981)