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ANZIAM J. 46(E) pp.C1336--C1352, 2006.

Flow instability prediction in low-pressure subcooled boiling flows using computational fluid dynamics codes

E. M. Dilla

G. H. Yeoh

J. Y. Tu

(received 25 October 2004, revised 21 November 2005)

Abstract

A proposed model for low pressure subcooled boiling flow was incorporated into the safety reactor code RELAP5/MOD3.2 to enhance the performance of the reactor code to predict the occurrence of the Ledinegg-type of instability in two phase flows. The nodalization scheme employed for the particular geometry as modeled in the RELAP5 code is described. The modified code was validated against experimental data and a marked improvement in predictive performance was noted. Simulation results using the modified RELAP5 code and CFX were also compared. Discrepancies between the modified RELAP5 predictions and the experimental benchmark were observed, particularly on the influence of subcooling on the flow instability.

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Authors

E. M. Dilla

School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, Victoria 3083, Australia. mailto:jiyuan.tu@rmit.edu.au

G. H. Yeoh

Australian Nuclear Science and Technology Organization, PMB 1, Menai, NSW 2234, Australia.

J. Y. Tu

Published January 6, 2006. ISSN 1446-8735

References

1. AEA Technology, CFX4.2: Solver, Didcot, Oxfordshire, UK, 1997.
2. R. W. Bowring, Physical model based on bubble detachment and calculation of steam voidage in the subcooled region of a heated channel, Report HPR-10, Institute for Atomenergi, Halden, Norway, 1962.
3. M. Courtaud, G. Coulon and F. Mazzili, Compte rendu d'essais boucle casimir traces de courbes ens, Centre D'etudes Nucleaires de Grenoble, Rapport TT/66-2-B/MC-GC/FM, 1966.
4. M. Courtaud and K. Schleisiek, Pertes de pression en ebullition locale a basse pression dans des canaux de section rectangulaire, Centre D'etudes Nucleaires de Grenoble, Rapport T.T. n 84, 1968.
5. C. D. Fletcher and R. R. Schultz, RELAP5/MOD3 code manual. User's Guidelines, NUREG/CR-5535, INEL-95/0174, Vol. 5, Rev. 1, 1995.
6. T. Hibiki and M. Ishii, Active nucleation site density in boiling systems, Int. J. Heat Mass Transfer, 46, 2587, 2003.
7. R. L. Judd and K. S. Hwang, A comprehensive model for nucleate pool boiling heat transfer including microlayer evaporation, ASME J. Heat Transfer, 98, 623, 1976.
8. G. Kocamustafaogullari and M. Ishii, Foundation of the interfacial area transport equation and its closure relations, Int. J. Heat Mass Transfer, 38, 481, 1995.
9. Y. Li, G. H. Yeoh and J. Y. Tu, Numerical investigation of static flow instability in a low-pressure subcooled boiling channel, Heat Mass Transfer, 40, 355, 2004.
10. A. K. Nayak, P. K. Vijayan, V. Jain, D. Saha and R. K. Sinha, Study on the flow pattern-transition instability in a natural circulation heavy water moderated boiling light water cooled reactor, Nuc. Eng. Design, 225, 159, 2003.
11. V. Prodanovic, D. Fraser and M. Salcudean, On the transition from partial to fully developed subcooled flow boiling, Int. J. Heat Mass Transfer, 45, 4727, 2002.
12. J. T. Rogers and J.-H. Li, Prediction of the onset of significant void in flow boiling of water, ASME J. Heat Transfer, 116, 1049, 1994.
13. Q. Sun, R. Yang and H. Zhao, Predictive study of the incipient point of net vapor generation in low-flow subcooled boiling, Nuc. Eng. Design, 225, 249, 2003.
14. H. Tang, Study on void fraction distribution and flow instability in a natural circulation system with subcooled boiling, Ph.D. Thesis, Tsinghua University, Beijing, China, 1999.
15. J. Y. Tu and G. H. Yeoh, On numerical modeling of low-pressure subcooled boiling flows, Int. J. Heat Mass Transfer, 45, 1197, 2002.
16. G. R. Warrier, N. Basu and V. K. Dhir, Interfacial heat transfer during subcooled flow boiling, Int. J. Heat Mass Transfer, 45, 3947, 2002.
17. G. H. Yeoh, J. Y. Tu and Y. Li, On void fraction distribution during two-phase boiling flow instability, Int. J. Heat Mass Transfer, 47, 413, 2004.
18. O. Zeitoun and M. Shoukri, Axial void fraction profile in low pressure subcooled flow boiling, Int. J. Heat Mass Transfer, 40, 867, 1997.