Water Model Experiment on the Behavior of an Argon Bubble Rising Near the Immersion Nozzle
Tsuyoshi Watanabe, Manabu Iguchi
Attack of a large argon bubble onto the meniscus in the continuous casting mold is considered to be one of main causes for the mold powder entrapment. The immersion nozzle is poorly wetted by molten steel and, accordingly, an argon bubble rising near the immersion nozzle attaches preferably to it. Its rising velocity has a significant effect on the mold powder entrapment. Water model experiments are carried out to reveal the rising velocity of an argon bubble rising along the immersion nozzle. Water and air are used as the models for molten steel and argon gas, respectively. The immersion nozzle is modeled by a cylindrical rod made of acrylic resin. Contact angles chosen are 77°, 110°, and 144°. An air bubble attaches to a rod of the contact angle of 144°. The rising velocity of the bubble is much greater than that of an air bubble rising away from the rod. It decreases with an increase in the rod diameter. The drag coefficient also is obtained for estimating the velocity of an argon bubble rising along the immersion nozzle.
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