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首页> 外文期刊>ISIJ international >Modelling of Non-isothermal Melt Flows in a Four Strand Delta　Shaped Billet Caster Tundish Validated by Water Model　Experiments
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Modelling of Non-isothermal Melt Flows in a Four Strand Delta　Shaped Billet Caster Tundish Validated by Water Model　Experiments

机译：水模型实验验证的四股三角形方坯连铸中间包非等温熔体流动模型

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摘要

A mathematical model was developed using ANSYS 12.0 in order to simulate non-isothermal melt flows in a delta shaped four strand billet caster tundish. The fluid inside the tundish considered was water, so that the CFD model could later be validated against water model experiments. The buoyancy term was included in the momentum equation using Boussinesq's approximation. Experiments were performed for both the bare tundish, and the tundish fitted with an impact pad. For the bare tundish, step inputs of 5-15℃ hotter fluid resulted in significantly stronger natural convection currents towards the extremities of the tundish. On the other hand, for cases of a tundish fitted with an impact pad, the effect of buoyancy driven flows due to step inputs of hot water, was much less pronounced since the pad itself had a big effect on regulating the fluid flow patterns. Step-down conditions were also simulated, where 10-15 degrees cooler fluid was introduced into a hotter liquid within the tundish. Detailed calculations were performed using the DPM, in order to evaluate the number of inclusions passing through the SENs under such transient conditions. While the step-up conditions facilitated the flotation of inclusions because of upward buoyancy driven flows, the step-down condition generated catastrophic results in terms of liquid metal quality. One third and full scale water model experiments were done to validate the numerical model and it was found that the mathematical predictions were in good agreement with the experimental results.
机译：使用ANSYS 12.0开发了数学模型，以模拟三角形状的四流坯方坯连铸中间包中的非等温熔体流动。所考虑的中间包内的流体是水，因此稍后可以针对水模型实验对CFD模型进行验证。使用Boussinesq近似将浮力项包括在动量方程中。对裸包中间包和装有冲击垫的中间包进行了实验。对于裸包中间包，步进输入5-15℃的高温流体会导致流向中间包末端的自然对流明显增强。另一方面，对于中间包装有冲击垫的情况，由于热水的逐步输入而产生的浮力驱动的流动的影响要小得多，因为冲击垫本身对调节流体的流动方式有很大的影响。还模拟了降压条件，其中将温度降低10-15度的液体引入中间包内较热的液体中。为了评估在这种瞬态条件下穿过SEN的夹杂物数量，使用DPM进行了详细的计算。尽管升压条件由于向上浮力驱动的流动而促进了夹杂物的浮选，但降压条件在液态金属质量方面产生了灾难性的结果。进行了三分之一的水模型实验，以验证数值模型的有效性，发现数学预测与实验结果吻合良好。

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  • 来源
    《ISIJ international》 |2012年第11期|p.2026-2035|共10页
  • 作者

    Kinnor CHATTOPADHYAY; Mihaiela ISAC; Roderick Ian Lawrence GUTHRIE;

  • 作者单位

    McGill Metals Processing Centre, Department of Mining and Materials Engineering, McGill University, Montreal, Quebec, H3A 2B2, Canada;

    McGill Metals Processing Centre, Department of Mining and Materials Engineering, McGill University, Montreal, Quebec, H3A 2B2, Canada;

    McGill Metals Processing Centre, Department of Mining and Materials Engineering, McGill University, Montreal, Quebec, H3A 2B2, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    tundish; mathematical modelling; water modelling; non-isothermal flows; inclusions; CFD;

    机译：中间包数学建模;水模型;非等温流动;夹杂物差价合约;

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