In order to find out the transport characteristics of radioactive aerosol in a serious accident under the actual containment size,the spatial distribution of radioactive aerosol in a serious accident was simulated by using the coupling of computational fluid dynamics and particle swarm equilibrium equation,and the effects of different coalescence and deposition mechanisms on the aerosol transport process are quantitatively analyzed.The results show that the interaction among aerosol particulates with a particle size smaller than 0.1 μm are mainly driven by Brownian coalescence,while those larger than 10 μm are dependent mainly on turbulent inertial coalescence,and those between the two sizes are dominated by both of Brownian coalescence and turbulent coalescence(turbulent inertial coalescence and turbulent shear coalescence).For the deposition phenomenon,the aerosols with particle size less than 0.1 μm rely mainly on Brownian deposition,while those larger than 0.1 μm are mainly affected by gravity deposition.It is found that the average coalescence velocity of turbulent coalescence is 2.99 times that of Brownian coalescence,and the average deposition rate of Brownian deposition is 1.38 times that of gravitational deposition.This study provides a solution for the selection of radioactive aerosol removal technology under the actual containment size.
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