Heat Transfer Profiles in a Vertical, Bare, 7-Element Bundle Cooled with Supercritical Freon-12
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
G8-1 Supercritical Water Reactors

Graham Richards (UOIT)
A.S. Shelegov (IPPE)
P.L. Kirillov (IPPE)
Igor Pioro (University of Ontario Institute of Technology)
Glenn Harvel (University of Ontario Institute of Technology)


Experimental data on SuperCritical-Water (SCW) cooled bundles are very limited. However,

SuperCritical Water-cooled nuclear Reactor (SCWRs) designs cannot be optimized without such

data. A set of experimental data obtained in Freon-12 (modeling fluid) cooled vertical bare

bundle at the Institute of Physics and Power Engineering (IPPE, Obninsk, Russia) was analyzed.

The existence of three distinct regimes for forced convention with supercritical fluids was

experienced. (1) Normal heat transfer; (2) Deteriorated heat transfer, characterized by higher

than expected temperatures; and (3) Enhanced heat transfer, characterized by lower than

expected temperatures. This work compares the heat transfer coefficient of the experiments to

predictions based upon current correlations for heat transfer in super critical fluids where the 1-D

correlations are based upon tube data under supercritical water conditions.

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