Euler-Euler CFD simulation of high velocity gas injection at pool scrubbing conditions

Abstract Pressure relief by blowdown is one of the most important measures to prevent excessive pressures in primary circuit or containment severe nuclear accidents. Pool scrubbing can significantly reduce release radioactive materials, e.g., aerosols, environment during pressure relief. The decontamination factor indicating particle retention efficiency depends, among other factors, on hydrodynamic conditions gas-liquid two-phase flow inside pool. In present work, hydrodynamics two typical pool experiments investigated with two-fluid model, and influence some key factors including bubble diameter, nozzle submergence as well interaction models are analysed. One case a rectangular cylindrical column, their injection Weber number around 2×10 3 4×10 5 , respectively. numerical results show that distance from exit increases, void fraction velocity field expand central region, where located, whole cross section. profile its development depends largely size force model. It reveals monodisperse simulation, tuning diameter necessary for achieving good agreement, although it difficult high gas injection. More information required properly describe distribution evolution conditions. Furthermore, experimental data clear drag reduction swarm generated jet, mechanism model improvement possibilities need be investigated.