Shape and Behavior of a Single Bubble Containing Aerosol Particles in Pool Scrubbing

Abstract

As one of the severe accident countermeasures, a method of injecting gas into pool water in a suppression chamber to capture and decontaminate aerosol particles contained in the gas is proposed. For severe accident countermeasures, a physical model for single bubbles representing hydrodynamic phenomena is included. The aim of this study is to elucidate the effect of aerosol particles on the shape and upward behavior of single large diameter bubbles. For this purpose, several aerosol particles with different solubility in tap water were used as parameters to investigate the effect of bubble diameter and Eötvös number on large single bubbles. As a result, the aspect ratio of single bubbles with aerosol particles is smaller than that of droplets without aerosol particles. Furthermore, the aspect ratio was smaller when containing soluble aerosol particles than insoluble aerosol particles. The terminal velocity and drag coefficient were less affected by aerosol particles in the region where bubble diameter is large. Comparison of the numerical and experimental results for aspect ratio showed a similar trend in the increase of aspect ratio with the increase of Eötvös number, but for the quantitative values, the experimental results were much lower than the numerical results.