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首页> 外文期刊>ISIJ international >Multiphase Vortex Flow Patterns in Slab Caster Mold: Experimental Study
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Multiphase Vortex Flow Patterns in Slab Caster Mold: Experimental Study

机译：板坯连铸结晶器中的多相涡流模式：实验研究

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Vortexing in continuous slab casting mould is a complex inter-related phenomenon of multiphase fluid flow which can entrain mould powder and deteriorate the end product quality. In this contribution, a 0.4-scale water model has been employed to investigate the interactive effects of the operational parameters including, partial clogging of SEN ports, water flow rates, submerged entry nozzle (SEN) immersion depth and air flow rates. Operating conditions like higher values of air flow rates and deeper submergence depth of the SEN are found to reduce vortex frequencies. At higher air flow rates, bubbles emerging from the SEN port would have higher diameter and hence higher terminal velocity. Also, at higher air flow rates, volume fraction in the vicinity of the SEN is high. Raising larger bubbles with high volume fraction and high terminal velocities, during their interaction with the liquid flow streams approaching the meniscus, would reduce the horizontal velocity components to very low values. As a consequence, the shearing effect between the liquid streams fast approaching the SEN would be decreased, leading to reduction in vortex frequencies. The bubble rising pattern along with the upper circulation loop is found to vary with the SEN submergence depth. At deeper submergence depth, larger fraction of gas bubbles traversing along the upper recirculation loop would reach to a point which is very close to the SEN and escape into atmosphere from there. On contrary, this point of contact between gas bubbles and the meniscus is comparatively away from the SEN at shallow submergence depths. As known, vortices are formed in the vicinity of the SEN where the shearing effect is the maximum. In case of deeper submergence depth, the ascending gas bubbles interact with the swirling and reduce the shearing effect and hence the vortex formation. These findings of the current study are important in controlling the mould powder entrainment through vortexing.
机译：板坯连铸结晶器中的涡旋是一种复杂的相互关联的现象，即多相流体流动会夹带结晶器粉末并降低最终产品质量。在此贡献中，采用了0.4比例的水模型来研究操作参数的交互作用，包括SEN端口的部分堵塞，水流量，浸入式喷嘴（SEN）的浸入深度和空气流量。人们发现，较高的空气流速值和SEN的更深浸入深度等运行条件会降低涡流频率。在较高的空气流速下，从SEN孔冒出的气泡将具有较大的直径，因此具有较高的最终速度。同样，在较高的空气流速下，SEN附近的体积分数很高。在与接近弯液面的液流相互作用的过程中，以高体积分数和高最终速度产生较大的气泡会将水平速度分量减小到非常低的值。结果，将减小快速接近SEN的液流之间的剪切作用，从而导致涡旋频率降低。发现气泡上升模式以及上部循环回路随SEN浸没深度而变化。在更深的浸没深度处，沿着上部再循环回路流过的较大比例的气泡将到达非常接近SEN的点，并从那里逃逸到大气中。相反，在较浅的浸没深度处，气泡和弯液面之间的接触点相对于SEN相对较远。众所周知，在SEN附近，剪切作用最大的地方会形成涡流。在更深的浸没深度的情况下，上升的气泡与涡旋相互作用并减小剪切作用，从而减小涡流的形成。当前研究的这些发现对于通过涡旋控制结晶器保护粉的夹带非常重要。

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