Evaluation of jet breakup behavior by the lattice Boltzmann HCZ model, 2; Effect of ambient fluid field on jet breakup

Iwasawa, Yuzuru*; Abe, Yutaka*; Matsuo, Eiji*; Ebihara, Kenichi   ; Kaneko, Akiko*; Sakaba, Hiroshi*; Koyama, Kazuya*

When supposing a core distractive accident (CDA) in a sodium-cooled fast reactor (SFR), it is necessary to understand the breakup behavior of the molten core material jet into coolant. In order to examine the effect of ambient fluid around the jet, the surface and fragmentation behavior was investigated using the lattice Boltzmann (LB) HCZ model. As a result, it was confirmed that the mechanism of the jet breakup behavior is one proposed by Epstein when hydrodynamic fragmentation is the dominant phenomenon for the jet break up.