2001 年 41 巻 Suppl 号 p. S47-S51
It has been acknowledged that swirling motion in the immersion nozzle is very effective to control the bulk mold flow. From the practical viewpoint, it is very reasonable for a swirling strength in the immersion nozzle to be as weak as possible while controlling the bulk mold flow. Here, a gradually diverging immersion nozzle is proposed and its characteristics and its effectiveness on controlling a bulk mold flow are investigated, using a water mold model.
Using even considerably weak swirling velocity (0.24 m/s) in an immersion nozzle, maximum velocity at the outlet of the nozzle, surface flow on the meniscus and upward velocity near the narrow face were reduced. However a variation of velocity in those cases was observed.
