Izvestiya vuzov. Yadernaya Energetika

The peer-reviewed scientific and technology journal. ISSN: 0204-3327

Temperature fields and heat transfer in free-packed pin bundles cooled by heavy liquid-metal

12/25/2015 2015 - #04 Thermal physics and thermal hydraulics

Zhukov A.V. Kuzina Yu.A. Sorokin A.P. Privezentsev V.V.

DOI: https://doi.org/10.26583/npe.2015.4.10

UDC: 621.039.546

In the paper heat transfer and temperature fields in free-packed pin bundles with heavy liquid-metal coolant are considered at various spacing ways. Experimental data for three pin bundles are analyzed for pitch of s/d = 1.33: a bundle of smooth fuel pins, a bundle of fuel pins spaced by bilifar-helix wire wrapper of «wire to wire» type and a bundle with spacer grids.

In the free=packed bundles of smooth fuel pins temperature non-uniformities over the perimeter of fuel pins are absent [1, 2] as opposed to high general temperature non-uniformities over the perimeter of fuel pins in the bundles with wire wrapping. Such high non-uniformities result in considerable decrease of heat transfer coefficients [3].

In the bundles with transverse spacer grids heat transfer increases only in the region of grids, but between them it is approximately equal to heat transfer coefficients in bundles of smooth fuel pins.

The correlations recommended for calculations of Nusselt numbers and temperature non-uniformities over the perimeter of fuel pins are given for the above-mentioned ways of spacing of fuel pins.

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liquid-metal coolant model fuel assembly experiment smooth fuel pins spacer grids helical wires temperature field Nusselt number temperature non-uniformities