Aerosol turbulent deposition characteristics under small and micro-scaled leakage paths

Abstract

The small and micro-scaled leakage path of steel containment has a retention effect on aerosol penetration under accident conditions, which is important for estimating radioactive release into the environment. Turbulent deposition mechanism may play an important role in aerosol retention in the leakage path. In this paper, experimental study on aerosol turbulent deposition is carried out in capillaries and a rectangular channel. The mass concentration and size distribution of aerosol are measured, and dimensionless analysis of experimental data are carried out. The results show that the dimensionless deposition velocity increases with the quadratic relationship of the dimensionless particle relaxation time under the condition of eddy diffusion-impaction regime. An empirical correlation has been established with Re and Kn to predict the turbulent deposition velocity, which is verified by additional experiments and is applicable to the characteristic size in range of 47 μm to 1000 μm, and the Re number of 700 to 3400.