Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
권호 표지
DOI QR코드

DOI QR Code

Experimental investigation on bubble behaviors in a water pool using the venturi scrubbing nozzle

  • Choi, Yu Jung (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Kam, Dong Hoon (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Papadopoulos, Petros (Paul Scherrer Institute) ;
  • Lind, Terttaliisa (Paul Scherrer Institute) ;
  • Jeong, Yong Hoon (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology (KAIST))
  • Received : 2020.04.19
  • Accepted : 2020.11.25
  • Published : 2021.06.25
Download PDF
⟨ Previous Next ⟩

Abstract

The containment filtered venting system (CFVS) filters the atmosphere of the containment building and discharges a part of it to the outside environment to prevent containment overpressure during severe accidents. The Korean CFVS has a tank that filters fission products from the containment atmosphere by pool scrubbing, which is the primary decontamination process; however, prediction of its performance has been done based on researches conducted under mild conditions than those of severe accidents. Bubble behavior in a pool is a key parameter of pool scrubbing. Therefore, the bubble behavior in the pool was analyzed under various injection flow rates observed at the venturi nozzles used in the Korean CFVS using a wire-mesh sensor. Based on the experimental results, void fraction model was modified using the existing correlation, and a new bubble size prediction model was developed. The modified void fraction model agreed well with the obtained experimental data. However, the newly developed bubble size prediction model showed different results to those established in previous studies because the venturi nozzle diameter considered in this study was larger than those in previous studies. Therefore, this is the first model that reflects actual design of a venturi scrubbing nozzle.

Keywords

Acknowledgement

This work was supported by the Nuclear Research & Development of the Korea Institute of Energy Technology and Planning (KETEP) grant funded by the Korea government Ministry of Trade, Industry & Energy (No: 2019311010050).

References

  1. S.W. Lee, et al., Containment depressurization capabilities of filtered venting system in 1000MWe PWR with large dry containment, Sci. Technol. Nucl. Install. 2014 (2014), 841895, https://doi.org/10.1155/2014/841895.
  2. S.W. Lee, Droplet Size Prediction Model Based on Upper Limit Log Normal Distribution in Venturi Scrubber, Ph.D. Dissertation, KAIST, 2019.
  3. D.D. Paul, et al., Radionuclide Scrubbing in Water Pools, Gas-Liquid Hydrodynamics 1, EPRI, 1985. NP-4154.
  4. S.A. Ramsdale, et al., Status of Research and Modelling of Water-Pool Scrubbing, Commission of the European Communities, 1992. EUR14566.
  5. A. Dehbi, et al., Aerosol retention in low-subcooling pools under realistic accident conditions, Nucl. Eng. Des. 203 (2019) 229-241. https://doi.org/10.1016/S0029-5493(00)00343-5
  6. P.C. Owczarsk, et al., SPARC-90: A Code for Calculating Fission Product Capture in Suppression Pools, US NRC, 1991. NUREG/CR-5765.
  7. S.A. Ramsdale, et al., BUSCA-JUN91 Reference Manual, PSI, 1995. ISSN 1019-0643.
  8. PSI, Thermal-hydraulic Characterization of the Korean Wet Scrubber, PSI, 2017, TM-42-16-17.
  9. T.T. Betschart, Two-phase Flow Investigations in Large Diameter Channels and Tube Bundles, ETH-Zurich, 2015. Diss. ETH No. 22954.
  10. H.M. Prasser, et al., Bubble recognition algorithms for the processing of wire-mesh sensor data, in: 6th ICMPF Conference, 2007. Germany.
  11. Wallis, One-dimensional Two-phase Flow, McGraw-Hill, 1969.
  12. Y.-F. Zhao, et al., The breakup of bubbles into jets during submerged gas injection, Metallurgical Transactions B 21 (B) (1990) 997-1003.
  13. R. Sundar, et al., A model for bubble-to-jet transition at a submerged orifice, Chem. Eng. Sci. 54 (1999) 4053-4060. https://doi.org/10.1016/S0009-2509(99)00152-9
  14. H. Hikita, et al., Gas hold-up in bubble columns, Chem. Eng. J. 20 (1980) 59-67. https://doi.org/10.1016/0300-9467(80)85006-4
  15. J.F. Davidson, et al., Fluidized Particles, Cambridge University Press, Cambridge, UK, 1963.
  16. K. Akita, F. Yoshida, Bubble size, interfacial area, and liquid-phase mass transfer coefficient in bubble columns, Ind. Eng. Chem. Process Des. Dev. 13 (1) (1974) 84-91. https://doi.org/10.1021/i260049a016
  17. E.S. Gaddis, A. Vogelpolh, Bubble formation in quiescent liquids under constant flow conditions, Chem. Eng. Res. Des. 75 (1986) S105-S115. https://doi.org/10.1016/S0263-8762(97)80008-1
  18. M. Jamialahmadi, et al., Study of bubble formation under constant flow conditions, Trans IChemE 79 (A) (2001) 523-532. https://doi.org/10.1205/02638760152424299
  19. Y.T. Shan, et al., Design parameters estimations for bubble column reactors, J. AIChE 28 (3) (1982) 353-379. https://doi.org/10.1002/aic.690280302