Heat transfer characteristics of internally heated liquid pools at high Rayleigh numbers |
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Authors: | A Liaqat A C Baytas |
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Institution: | (1) Institute for Nuclear Energy Istanbul Technical University 80626 Maslak Istanbul, Turkey, TR |
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Abstract: | Detailed numerical analysis is presented for buoyancy driven flow of a Newtonian fluid contained in a square enclosure for
high Rayleigh (Ra) numbers. Natural convection is due to internal heating sources, which are assumed to be uniformly distributed
within the enclosure. All walls of the cavity are maintained at constant temperature. Flow and heat transfer characteristics
are investigated for a Ra number range of 107 to 1012 while Prandtl (Pr) number is taken to be 7.0. Governing equations (in primitive variables) are discretised using control
volume technique based on staggered grid formulation. These equations are solved using SIMPLER algorithm of Patankar. Flow
and heat transfer characteristics, streamlines, isotherms and average wall Nusselt (Nu) number, are presented for whole range
of Ra number considered. Finally, present results for average wall Nu numbers are compared with experimental observations
obtained from open literature. It is concluded that both results are in very good agreement, which confirmed the accuracy
of the scaling used for present investigation.
Received on 15 November 1999 |
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