On the one hand,the Neutrino experimental facility needs to shield a lot of cosmic rays and natural radioactivity from rocks,air and dust.On the other hand,it is necessary to reduce the radioactive background of the experimental facility as much as possible.In this paper,the displacement process of liquid scinulator(liquid flash)and ultrapure water in the central detector(large-diameter spherical tank)is studied by CFD simulation.The situation of radioactive impurities in the water entering the liquid scinulator is analyzed,and the effect of natural convection on the liquid flash background during the displacement is studied.By simulating the two conditions of"no natural convection"and"with natural convection",the phase and flow distribution under the two different conditions was obtained,and the changes in the phase content with time are also obtained.The vertical upward velocity at the phase interface was extracted,and the total upward flow of the section was calculated to judge the influence of natural convection on the displacement process.The results show that the upward average volume flow of the liquid scintillator in the natural convection is less than that under the condition of no natural convection,which shows that natural convection can inhibit radioactive impurities from entering the liquid scintillator.
Large diameter spherical tankCFDDisplacementNatural convection
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