Host: The Japan Society of Mechanical Engineers
Name : The 30th International Conference on Nuclear Engineering (ICONE30)
Date : May 21, 2023 - May 26, 2023
In a nuclear reactor accident, radioactive aerosols may be released into the gas and retained in the pool through engineering safety design or the deposition of aerosols. The bubbles generated in the pool through gas injection or heating and boiling rise to the free surface and burst to produce film and jet droplets, which can entrain the aerosol in the liquid into the gas. In this process, many parameters influence each other and lead to changes in the generation of droplets. The applicability of the calculation model of key parameters under different working conditions needs to be further verified. This paper uses high-speed photography to visualize the phenomenon of a single bubble burst to produce film droplets. The bubble diameter, bubble lifetime, bubble film opening rate, bubble film thickness, and the size and number of film droplets are obtained by image processing software. It is found that the bubble lifetime distribution obeys the Weibull distribution with a shape parameter of 4/3 in deionized water, but the shape parameters shift to 3/2 in 0.05 g/L TiO2 aerosol suspension. The film thickness and bubble lifetime show an exponential decay law with a parameter of 2/3. The number of film droplets decreases with the increase in film thickness, and the size of film droplets increases with the increase of the film thickness.
