Numerical evaluation of fluid mixing phenomena in boiling water reactor using advanced interface-tracking method

Yoshida, Hiroyuki; Nagayoshi, Takuji*; Takase, Kazuyuki; Akimoto, Hajime

Proceedings of 5th Joint ASME/JSME Fluids Engineering Conference (FEDSM 2007) (CD-ROM), 8 Pages, 2007/07

Numerical study of gas and cavitation bubble dynamics in liquid mercury under negative pressure

Ida, Masato; Naoe, Takashi; Futakawa, Masatoshi

Proceedings of 5th Joint ASME/JSME Fluids Engineering Conference (FEDSM 2007) (CD-ROM), 6 Pages, 2007/07

Gas and cavitation bubble dynamics have been studied numerically to evaluate the effect of gas bubble injection on the suppression of cavitation inception. In our previous studies it has been demonstrated by direct observation that cavitation occurs in liquid mercury when mechanical impacts are imposed and it must seriously shorten the lifetime of the mercury spallation target of the J-PARC. In this paper, we have performed numerical studies on the dynamics of cavitation bubbles in liquid mercury with and without preexisting gas bubbles, and have clarified that if the mercury involves gas bubbles much larger than the cavitation nuclei, cavitation inception is effectively suppressed due to the positive pressure radiated by the gas bubbles.