The effect of swirl flow in an immersion nozzle on the heat and fluid flow in a billet continuous casting mold
The effect of swirl flow in an immersion nozzle on the heat and fluid flow in a billet continuous casting mold
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DOI：
10.1111/j.1600-0692.2004.00665.x
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发表时间：
2004-02
期刊：
影响因子：
--
通讯作者：
S. Yokoya;P. Jönsson;Kiyoto Sasaki;K. Tada;S. Takagi;M. Iguchi
中科院分区：
文献类型：
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作者：
S. Yokoya;P. Jönsson;Kiyoto Sasaki;K. Tada;S. Takagi;M. Iguchi
为控制方坯连铸结晶器内的传热传质，采用新型的浇注技术--浇注管内旋流技术，对方坯连铸结晶器内的传热传质过程进行了数值分析和水模型研究。研究结果表明：在结晶器壁角附近存在一个弱的冲击流，促进了结晶器内传热传质的均匀性，特别是在结晶器角附近。在结晶器上部的拐角处，可以观察到从喷嘴出口附近指向弯月面的向上流动，这导致到弯月面中的活跃的热质传递。从喷嘴出口向下200 mm的短距离内可以获得均匀的速度和热量分布。在扩张浸入式水口和直浸入式水口之间观察到了非常不同的结晶器流动模式。结晶器内的传热传质采用扩张型喷嘴比采用直型喷嘴更为合理。
A numerical analysis and a water model study of the mold region of a billet continuous caster was performed with a novel injection concept using swirling flow in the pouring tube, to control the heat and mass transfer in the continuous casting mold. The following results were found: A weak impinging flow can be observed near the corner of the mold wall, which results in the promotion of uniform heat and mass transfer all around across the plane, particularly at the casting corner. An upward flow directed from the vicinity of the nozzle outlet to the meniscus can be observed near the corner of the upper part of the mold, which leads to the active heat and mass transfer into the meniscus. A uniform velocity and heat distribution can be obtained within a short distance of 200 mm downward from the outlet of the nozzle. Quite different mold flow patterns are observed between the divergent and straight immersion nozzles. Heat and mass transport in the mold using the divergent nozzle is much more reasonable than that using the straight nozzle.