ANALYSIS OF LIQUID METAL HEAT TRANSFER IN ASSEMBLIES OF CLOSELY SPACED FUEL RODS.

Abstract An analysis is presented of heat transfer in infinite triangular or rectangular arrays of fuel rods cooled by a liquid metal in turbulent axial flow. It involves the simultaneous solution of the heat conduction equations for fuel, bond, cladding and coolant. Fully developed flow and heat transfer conditions are considered. For close rod spacings and Peclet numbers greater than 300 the analysis is expected to yield somewhat pessimistic results due to the assumption that in the coolant turbulent heat transport is negligible with respect to heat conduction. Illustrative results have been presented for dimensionless rod spacings in the range p = 1 – 1.15 and various rod material combinations of practical interest. Theoretical predictions agree well with available experimental data at p = 1 .

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