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ISSN Online: 2377-424X

ISBN Print: 0-89116-130-9

International Heat Transfer Conference 6
August, 7-11, 1978, Toronto, Canada

SODIUM NATURAL CONVECTION FROM A VERTICAL PLATE

Get access (open in a dialog) DOI: 10.1615/IHTC6.3590
pages 131-136

Resumo

There are many components in LMFBR's which are in contact with quiescent sodium, and consequently natural convective heat transfer conditions are of interest to the designers. This paper describes a sodium natural convection experiment in which the primary objective was to establish the validity of analytical correlations for a low Prandtl number fluid (Pr ~ 0.007).

The experiment consists of an. electrically heated vertical plate (316mm high × 300mm wide) immersed in a sodium pool (690mm long × 300mm wide × 600mm deep); the latter is cooled externally by a highly rated air cooler. Varying thermal conditions can be applied, at the heater surface from six independently adjustable heater sections which comprise the heater. Constant heat flux conditions were used in all of the tests reported.

At the most suitable operating conditions the modified Grashof number range was 1×106 to 3×1011, and the experimental results have been correlated in the form Nux = A(Gr*x Pr2)n. The experimental values obtained for the constants are A = 0.674 and n = 0.213 for Gr*x up to 1010, and these compare favourably with values obtained analytically. Deviations from the laminar theory at Gr*x > 2×1011 are considered to be caused by the onset of turbul¬ent convection.