Investigation of heat transfer in the gas mixture flow with the small Prandtl number in a rod assembly with separating grids
O.V. Vitovsky, M.S. Makarov, K.S. Lebeda, V.S. Naumkin
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Keywords: helium-xenon mixture, heat transfer, rod assembly, temperature distribution, Nusselt number
Abstract
The experimental results on heat transfer in the gas coolant flow in a space formed by a dense packing of seven heated tubes are presented. Eight separating inserts with longitudinal displacers were used to fix the tubes and ensure a uniform gas flow field in the internal and external channels of the tube bundle. Gas mixtures with a large difference in the Prandtl number were used as the working fluid: air (Pr = 0.7) and helium-xenon mixture (Pr = 0.23). The experiments were carried out in the range of Reynolds numbers of 2218 - 12900.
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