The enhancement of core heat transfer is one of the important ways to improve the efficiency and ensure the safe operation of space nuclear energy system.Liquid sodium metal,with its advantages of high thermal conductivity and low viscosity,is an excellent core coolant.In this work,a three-dimensional cooling channel model is developed and numerical simulations of the flow and heat transfer of liquid sodium metal in a single channel are performed.Core outlet temperature,Nusselt number,and pressure drop are taken as observed parameters,and the effects of Reynolds number and core power density on flow,heat transfer and pressure drop of liquid sodium metal are investigated one by one.The results show that the increase of Reynolds number has a positive effect on the enhancement of the performance of core heat transfer,but the pressure drop also increases.Higher core outlet temperature can be obtained at higher core power density,but the effect of this value on heat transfer characteristics can be ignored.The above research results provide a theoretical basis for core strengthening.
thermal hydraulicsliquid metal sodiumperformance analysisnumerical simulation
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