Post-dryout heat transfer

Nelson RA, Pasamehmetoglu KO (1992) Quenching phenomena. In Hewitt GF, Delhaye JM, Zu-ber N (eds) Post-dryout Heat transfer. CRC, Boca Raton, pp 39-184 Owens WL (1961) Two-phase pressure gradient. In ASME International Developments in Heat Transfer, Part II. ASME, New York... 

Cumo, M., G. E. Farello, andG. Ferrari, 1971, The Influence of Curvature in Post Dryout Heat Transfer, Rep. of XXVI Natl. ATI Annual Meeting, L Aquilia, Italy. (4)... 

Kumamaru, H., Y. Koizumi, and K. Tasake, 1987, Investigation of Pre- and Post-Dryout Heat Transfer of Steam-Water Two-Phase Flow in Rod Bundles, Nuclear Eng. Design 702 71-84. (4) Kutateladze, S. S., 1952, Heat Transfer in Condensation and Boiling, USAEC Rep. AEC-tr-3770 (Translated from Mashgiz, 2d ed., pp. 76-107, State Sci. Tech. Pub. House of Literature on Machinery, Moscow-Leningrad). (2)... 

Varone, Jr. A. F., and W. M. Rohsenow, 1986, Post-dryout Heat Transfer Prediction, Nuclear Eng Design 95/315-317. (4)... 

G. F. Hewitt, J. M. Delhaye, and N. Zuber, eds., Post-Dryout Heat Transfer, CRC Press, Boca Raton, FL, 1992. 

D. C. Groeneveld, Post-Dryout Heat Transfer at Reactor Operating Conditions, AECL-4513,1973. 

A. F. Varone and W. M. Rohsenow, Post-Dryout Heat Transfer Prediction, in Proc. First Int. Workshop on Fundamental Aspects of Post-Dryout Heat Transfer, Salt Lake City, UT, NUREG/CP-0060, April 2-4,1984. 

L. E. Hochreiter, M. J. Loftus, F. J. Erbacher, P. Ihle, and K. Rust, Post CHF Effects of Spacer Grids and Blockages in Rod Bundles, in Post-Dryout Heat Transfer, G. F. Hewitt, J. M. Delhaye, and N. Zuber eds., chap. 3, CRC Press, Boca Raton, FL, 1992. 

Groeneveld, D.C. 1973. Post dryout heat transfer at reactor operating conditions. ANS Conference 730304, pp. 321-350. 

The litterature survey does not provide good local heat transfer correlations in the post-dryout... 

N.T. Obot and M. Ishii, Two-phase Flow Regime Transition Criteria in Post Dryout Region Based on Flow Visualization Experiments, Int. J. Heat Mass Transfer 31, (1989) 2559-2570. 

The terms dryout occurrence appear in the right part of Fig. 1, when primary system mass inventory is roughly lower than 40% of the nominal value. Dryout is caused by the combination of low flow and high void fraction. As a consequence, film boiling heat transfer regime is experienced with low coefficient for heat transfer. Rod surface temperature increases in various zones of the core and the overall process of thermal power transfer from fuel rods to the fluid may become unstable. The system operation in these conditions is not acceptable from a technological point of view. It may be noted that the temperature excursion is strongly affected by primary system pressure and thermal power levels the linear rod power plays a role in these conditions. At primary system pressure around 15 MPa (nominal operation for PWR), post-dryout surface temperature jumps may be as low as a few tens of Kelvin, tolerable for the mechanical resistance of the rod-clad material. 

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