Heat and Mass Transfer

, Volume 40, Issue 11, pp 853–858 | Cite as

A numerical study of natural convection from a localized heat source in the lower plenum of a fast breeder reactor under failed conditions

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Abstract.

A comprehensive numerical study has been done to investigate two-dimensional, steady state, conjugate natural heat convection in the hemi spherical lower plenum of a fast breeder reactor under failed conditions. The continuity, momentum and energy equations are solved over the entire domain, using the corresponding properties for the solid and fluid regions. The control volume approach is employed in order to discretize the governing equations for their numerical solution. A parametric study has been done to study the variation of the velocity vectors and isotherms for different constant temperature of the heat source, simulating different heat generation rates. The actual problem in a nuclear reactor involves a volumetric heat generation in the debris falling over the heat shield plate under failed conditions of the reactor and heat is removed by a decay heat exchanger serving as a sink. In this study we have reduced this transient problem to a quasi-steady problem with a prescribed temperature on the heat shield plate. This makes the problem more tractable. The fluid flow pattern, variation of the temperature along the axis in and around the heat source are presented to show the overall heat transfer characteristics inside the plenum.

Keywords

Heat Transfer Coefficient Natural Convection Rayleigh Number Heat Transfer Rate Free Convection 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Notes

Acknowledgements.

Support of this work by Mr S.E. Kannan, Head, Safety engineering Division/ SHINEG of Indira Gandhi Center for Atomic Research, Department of Atomic Energy, Government of India, Kalpakkam-603102, India, is gratefully acknowledged.

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Copyright information

© Springer-Verlag  2003

Authors and Affiliations

  1. 1.Heat Transer and Thermal Power Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai - 600 036, India

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