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首页> 外文期刊>ISIJ international >Physical and Mathematical Models of Vortex Flows During The Last Stages of Steel Draining Operations from a Ladle
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Physical and Mathematical Models of Vortex Flows During The Last Stages of Steel Draining Operations from a Ladle

机译：钢包从钢水排放的最后阶段涡流的物理和数学模型

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摘要

Slag entrainment during steel teeming-drain operations from a steel ladle impacts negatively steel cleanliness and quality. In the present work water modeling and mathematical simulations using a multiphase model for momentum and heat transfer were employed to understand the mechanisms of vortex funnel drain and sink drain flows. The critical bath height for vortex development increases with steel throughput and valve gate opening. Six stages during vortex development are identified, passing from a dimple formation on the bath surface until sink drain which begins when the bath level has the same magnitude as the nozzle diameter. This later drain pattern is independent from any other teeming-draining variable being only a function of the bath height and nozzle diameter; when they are about the same the metal-interface collapses. The temperature gradients originated by the heat losses of the ladle to the surroundings provide buoyancy forces that are large enough to influence liquid motion in the ladle. At large bath levels steel observes long-vertical recirculating flows and at low bath levels these flows change to horizontal-circular recirculating flows that become a seed for later vortex development. These buoyancy forces increase the critical height for vortex development and slag entrainment.
机译：钢包浇注和排水操作过程中夹带的炉渣会对钢的清洁度和质量产生负面影响。在目前的工作中，采用了动量和传热的多相模型进行水建模和数学模拟，以了解涡流漏斗和汇槽排水流的机理。涡旋发展的临界熔池高度随钢产量和阀门浇口打开而增加。确定了涡旋发展过程中的六个阶段，从熔池表面的凹坑形成一直到下沉排水，这在熔池水位与喷嘴直径大小相同时开始。后面的排水方式与任何其他浸水-排水变量无关，仅与浴槽高度和喷嘴直径有关。当它们大致相同时，金属界面会塌陷。钢包向周围环境散失的热量产生的温度梯度提供了足以影响钢包内液体运动的浮力。在大熔池水位时，钢会观察到长垂直循环流，而在低熔池水位时，这些流会变为水平圆形循环流，从而成为后期涡流发展的种子。这些浮力增加了涡流发展和夹渣的临界高度。

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