Abstract
The radioactive aerosols deposited wash-down by condensate on walls in containment is one of the pathways for radioactive migration. Condensate film coverage is critical to the transport properties of aerosol particles during wash-down. In this paper, an experimental study was carried out to visualize the processes of condensation and aerosol wash-down on an aerosol-containing wall. The evolutionary pattern of condensate was observed in the experiment. Variations in condensate coverage on walls with different inclination angles of 0°, 0.4°, 2°, 30°, and 90° were noted. The effect of coverage on aerosol removal efficiency was also analyzed based on the results. Experimental results show that wall coverage on horizontal (0°) or quasi-horizontal walls (0.4°) is close to 100 %. For inclined or vertical walls, under the influence of thermal capillary forces, rivulets are the main forms of condensate coverage, with the maximum area that can be covered by rivulets being about 2/3 of the wall area. The experimental results show that the removal efficiency of aerosol during washing will be higher than the coverage rate of condensate. In the experiments, both condensation rate and aerosol loading tended to promote the spreading of condensate.
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