Heat transfer analysis in sub-channels of rod bundle geometry with supercritical water

Edward Shitsi; Seth Kofi Debrah; Silas Chabi; Emmanuel Maurice Arthur; Isaac Kwasi Baidoo

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자료유형: 학술저널

저자정보: Edward Shitsi (University of Ghana) Seth Kofi Debrah (University of Ghana) Silas Chabi (University of Ghana) Emmanuel Maurice Arthur (University of Ghana) Isaac Kwasi Baidoo (National Nuclear Research Institute, Ghana Atomic Energy Commission GAEC)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제54권 제3호

발행연도: 2022.3

수록면: 842 - 848 (7page)

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Parametric studies of heat transfer and fluid flow are very important research of interest because thedesign and operation of fluid flow and heat transfer systems are guided by these parametric studies. Thesafety of the system operation and system optimization can be determined by decreasing or increasingparticular fluid flow and heat transfer parameter while keeping other parameters constant. The parametersthat can be varied in order to determine safe and optimized system include system pressure,mass flow rate, heat flux and coolant inlet temperature among other parameters. The fluid flow and heattransfer systems can also be enhanced by the presence of or without the presence of particular effectsincluding gravity effect among others. The advanced Generation IV reactors to be deployed for largeelectricity production, have proven to be more thermally efficient (approximately 45% thermal efficiency)than the current light water reactors with a thermal efficiency of approximately 33 C. SCWR is one of theGeneration IV reactors intended for electricity generation. High Performance Light Water Reactor(HPLWR) is a SCWR type which is under consideration in this study. One-eighth of a proposed fuel assemblydesign for HPLWR consisting of 7 fuel/rod bundles with 9 coolant sub-channels was the geometryconsidered in this study to examine the effects of system pressure and mass flow rate on wall and fluidtemperatures. Gravity effect on wall and fluid temperatures were also examined on this one-eighth fuelassembly geometry. Computational Fluid Dynamics (CFD) code, STAR-CCMþ, was used to obtain theresults of the numerical simulations. Based on the parametric analysis carried out, sub-channel 4 performedbetter in terms of heat transfer because temperatures predicted in sub-channel 9 (corner subchannel)were higher than the ones obtained in sub-channel 4 (central sub-channel). The influence ofsystem mass flow rate, pressure and gravity seem similar in both sub-channels 4 and 9 with temperaturedistributions higher in sub-channel 9 than in sub-channel 4. In most of the cases considered, temperaturedistributions (for both fluid and wall) obtained at 25 MPa are higher than those obtained at 23 MPa,temperature distributions obtained at 601.2 kg/h are higher than those obtained at 561.2 kg/h, andtemperature distributions obtained without gravity effect are higher than those obtained with gravityeffect. The results show that effects of system pressure, mass flowrate and gravity on fluid flow and heattransfer are significant and therefore parametric studies need to be performed to determine safe andoptimum operating conditions of fluid flow and heat transfer systems.

#Fuel assembly #Sub-channels #Heat transfer #Computational fluid dynamics #Supercritical water cooled reactor

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