Calculations of Combined Radiation and Convection Heat Transfer in Rod Bundles Under Emergency Cooling Conditions

[+] Author and Article Information
K. H. Sun, J. M. Gonzalez-Santalo

Nuclear Energy Systems Division, General Electric Co., San Jose, Calif.

C. L. Tien

Department of Mechanical Engineering, University of California, Berkeley, Calif.

J. Heat Transfer 98(3), 414-420 (Aug 01, 1976) (7 pages) doi:10.1115/1.3450569 History: Received November 18, 1975; Online August 11, 2010


A model has been developed to calculate the heat transfer coefficients from the fuel rods to the steam-droplet mixture typical of Boiling Water Reactors under Emergency Core Cooling System (ECCS) operation conditions during a postulated loss-of-coolant accident. The model includes the heat transfer by convection to the vapor, the radiation from the surfaces to both the water droplets and the vapor, and the effects of droplet evaporation. The combined convection and radiation heat transfer coefficient can be evaluated with respect to the characteristic droplet size. Calculations of the heat transfer coefficient based on the droplet sizes obtained from the existing literature are consistent with those determined empirically from the Full-Length-Emergency-Cooling-Heat-Transfer (FLECHT) program. The present model can also be used to assess the effects of geometrical distortions (or deviations from nominal dimensions) on the heat transfer to the cooling medium in a rod bundle.

Copyright © 1976 by ASME
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