2019 年 105 巻 1 号 p. 10-19
Experimental and numerical investigations were carried out to understand cavity formation on a water and a low-melting-point metal bath induced by gas blowing from a top lance set in the near field of the bath surface. A cavity formation behavior was classified by the critical gas velocity of the droplet formation. The depth of the cavity formed in the near field of the gas jet was reasonably predicted by numerical simulation. An empirical equation was newly proposed for the cavity depth as a function of a modified Froude number.