Numerical Simulation Study Of Heat Transfer Characteristics Of Liquid Lead-bismuth Alloy And Application

Accelerator-driven subcritical systems (ADS) can overcome the obstacles ofnuclear waste for the sustainable development of nuclear energy, and must be facedwith a wide variety challenging of science and technology problems. In order to studythese problems, the KYLIN-â…¡ experimental loop has been constructed based on theKYLIN-â…  experimental loop by one research institute. To build the KYLIN-â…¡experimental loop, liquid metal thermal numerical simulation has been researched inthis paper. And then some equipment of the experimental loop was designed andsimulated. The main content in the following:1) Numerical simulation was employed to analyze heat conduction and flowproperties of the coolant LBE (Lead Bismuth Eutectic) in ADS (Accelerator DrivenSubcritical System). First of all, independence of the numerically simulated grids hasbeen verified. Then, grid parameters and precision of the selected model have beenfurther tested by experiment. Finally, given that velocity-inlet and mass-flow-inlet areconstant, variation of the heat-exchange coefficient has been studied by changing theinner diameter of internal tube of the LBE heat exchanger. Simulation Results showedthat: with the velocity-inlet in both internal and external tubes keeping at0.6m/s, thecomprehensive heat-exchange coefficient decreased first and then increased as theinner diameter of the internal tube was increased from22mm to37mm, and when theinner diameter was27mm the average heat-transfer coefficient reached the minimumof1987KW/(m2ï¹'K); and, with the mass-flow-inlet keeping at6kg/s, theheat-exchange coefficient also decreased first and then increased as the inner diameterwas increased from22mm to37mm, and when the inner diameter was24mm theaverage heat-transfer coefficient reached the minimum of2021KW/(m2ï¹'K).Provide evidence for cooler, returning heat exchanger design and simulation.2) Recommended the experimental correlation have been used to design andchecked calculation on the cooler and returning exchanger. The pressure loss has alsobeen calculated in this chapter. The designed heater (designed by manufacture) wascalculated in qualitative verification. And the thermal loop of test ran have been detailed.3) It was overload for the microcomputer to calculate by the three models (RKE,RNG, and RSM). The standard k-e model and the parameters of grid have beenverified to engineering calculation. The coolers (Cooler a and b) and returning heatexchanger have been studied by simulation under experimental condition. The resultsof simulation and design in heat exchangers was compared in pressure loss and heatexchange. And the deviation of heat exchange is less than5%, while the maximumdeviation of pressure loss is30.9%. And it means calculation formula of coefficient offrictional resistance for resistance calculation of liquid metals have some limitations.At last, the tube material of heater was credible under the experimental condition bythe numerical simulation.