[1H01-07] Numerical Analysis

3:00 PM - 3:15 PM JST(6:00 AM - 6:15 AM UTC)

[1H02] Numerical Simulation of Breakup Characteristics of Sodium Liquid Jet

*Guofu Sun¹, Susumu Yamashita², Tomio Okawa¹, Hiroyuki Yoshida² (1. UEC, 2. JAEA)

Keywords:

fast reactor,liquid sodium,numerical simulation,jet,breakup characteristic,JUPITER

When coolant leak occurs in sodium-cooled fast reactors, liquid sodium jet ejected from damaged piping can impact solid surfaces such as floors, generating splashing droplets. These droplets significantly increase the contact area between sodium and atmosphere, thereby intensifying combustion reactions. The quantity and size of splashing droplets, which influence the contact area, depend on the jet's state during impact. Therefore, understanding the falling behavior of the jet is crucial. This work investigates the breakup characteristic of falling liquid sodium jets at low velocities using the CFD code JUPITER. The simulation results exhibit a high degree of consistency with values calculated using extrapolation from empirical equations derived from surrogate fluid experiments. This validation confirms the reliability of both experimental and numerical methods, providing a solid foundation for future studies.