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Numerical simulation on heat convection of supercriticalwater flow in axisymmetric channel(PDF)


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Numerical simulation on heat convection of supercriticalwater flow in axisymmetric channel
Wang LinglongHu DinghuaLv Xujian
School of Energy and Power Engineering,Nanjing University of Science and Technology,Nanjing 210094,China
axisymmetric channels supercritical water light water reactors heat flux densities heat convection enhancement heat convection deterioration
The heat convection process between the supercritical water and pipe wall in a vertical annular channel is numerically simulated by Fluent to investigate the flow and thermal characteristics of the working fluid in cooling channels of a high performance light water reactor. The influence of different grid numbers,the height between the adjacent grid and the wall and turbulence models on the accuracy of numerical simulation is evaluated by the comparison between the numerical and the experimental data. Five turbulent models are compared by computation. The core heat convection simulation is carried out for three different heat flux densities. The simulation results show that the accuracy of the forecast improves with increasing grid number and decreasing height between the adjacent grid and the wall,and the accuracy of the forecast has nothing to do with the height between the adjacent grid and the wall less than 0.07; the standard k-ω model and the SST k-ω model can predict the heat convection deterioration of the core either,and the SST k-ω model shows better accuracy; the significant change of physical properties in the near wall area is the main reason for heat convection enhancement or heat convection deterioration.


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Last Update: 2019-06-30