Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
권호 표지

AN EXPERIMENTAL STUDY ON AIR-WATER COUNTERCURRENT FLOW LIMITATION IN THE UPPER PLENUM WITH A MULTI-HOLE PLATE

  • Published : 2005.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

Air-water countercurrent flow limitation at perforated plates with four holes was investigated in a vertical tank to see the effects of the plate thickness, the number of hole, and the diameter of the hole on the onset of CCFL. The thickness of plates was 1 cm and 4 cm, with a relatively large hole diameter of 5 cm. The collapsed water level formed on the perforated plate and its distribution in the upper plenum were measured. The gas flow rate in the multi-hole plate is relatively higher than one in the single tube because some of holes in the multi-hole plate provide a flow path fur liquid with less air-liquid resistance than in the single tube. The onset of CCFL occurred at nearly the same air flow rate regardless of the plate thickness. The negligible effect of the plate thickness on CCFL means that the flooding is initiated at the top of the plate rather than at its bottom. It turns out that $j_k$ and $K_k$ better fit the data than $H_k$ when hole diameter is greater than 2.86 cm. In our experimental ranges, the collapsed water levels at the onset of CCFL ranged from 7.5 cm to 10.5 cm. There was no three dimensional distribution of water level before and after the onset of CCFL.

Keywords

References

  1. P. S. Damerell and J. W. Simons, 'Reactor Safety Issues Resolved by the 2D/3D Program,' NUREG/IA-0127 (1993)
  2. G. B. Wallis, One-dimensional Two-phase Flow, McGraw-Hill, New York, 336-345, 1969
  3. S. G. Bankoff and S. C. Lee, Multiphase Science and Technology, Vol. 2 (Edited by G.F. Hewitt, J.M. Delhaye, N. Zuber), Chapter 2, A Critical Review of the Flooding Literature, Hemisphere, New York (1985)
  4. S. G. Bankoff, R. S. Tankin, M. C. Yuen and C. L. Hsieh, 'Countercurrent Flow of Air/Water and Steam/Water Through a Horizontal Perforated Plate,' Int. J. Heat Mass Transfer, 24, 8, 1381-1395 (1981) https://doi.org/10.1016/0017-9310(81)90188-5
  5. H. M. Lee, G. E. McCarthy and C. L. Tien, 'Liquid Carryover and Entrainment in Air-water Countercurrent Flooding,' EPRI report, NP-2344 (1982)
  6. M. Sobajima, 'Experimental Modeling of Steam-Water Countercurrent Flow Limit for Perforated Plates,' J. Nuclear Science and Technology, 22, 9, 723-732 (1985) https://doi.org/10.3327/jnst.22.723
  7. G. P. Celata, N. Cumo, G. E. Farello, and T. Setaro, 'The Influence of Flow Obstructions on the Flooding Phenomenon in Vertical Channels,' Int. J. Multiphase Flow, 15, 2, 227-239 (1989) https://doi.org/10.1016/0301-9322(89)90072-4
  8. I. Kokkonen and H. Tuomisto, 'Air/Water Countercurrent Flow Limitation Experiments with Full-Scale Fuel Bundle Structures,' Experimental Thermal and Fluid Science, 3, 581-587 (1990) https://doi.org/10.1016/0894-1777(90)90074-H
  9. J. Zhang, J. M. Seynhaeve and M. Giot, 'Experiments on the Hydrodynamics of Air-Water Countercurrent Flow Through Vertical Short Multitube Geometries,' Experimental Thermal and Fluid Science, 5, 755-769 (1992) https://doi.org/10.1016/0894-1777(92)90119-P
  10. J. H. Jeong and H. C. No, 'Experimental Study of the Effect of Pipe Length and Pipe-end Geometry on Flooding,' Int. J. Multiphase Flow, 22, 1, 499-514 (1996) https://doi.org/10.1016/0301-9322(95)00087-9
  11. S. J. Kline and F. A. McClintock, 'Describing Uncertainties in Single Sample Experiments,' Mechanical Engineering, 75, 3-8 (1953)