Modeling of Fluid Flow and Residence-Time Distribution in a Five-Strand Tundish
Modeling of Fluid Flow and Residence-Time Distribution in a Five-Strand Tundish
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DOI：
10.20944/preprints202007.0354.v1
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发表时间：
2020-07
期刊：
影响因子：
2.9
通讯作者：
D. Sheng;Q. Yue
中科院分区：
文献类型：
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作者：
D. Sheng;Q. Yue
定量停留时间分布（RTD）提供了连铸中间包混合的数值表征，从而使工程师能够更好地了解反应器的冶金性能。本文采用计算流体动力学（CFD）模型研究了五股中间包内的流态和停留时间分布。采用两个被动标量输运方程分别计算了中间包内的e曲线和f曲线。将数值模拟结果与水模拟结果进行了对比，验证了数学模型的正确性。通过计算钢包转换过程中不同流动区（堵塞区、混合区和死水区）的体积分数和混合时间，研究了流动控制装置对中间包性能的影响。从CFD计算结果可以看出，带导流孔的u型折流板与湍流抑制剂的组合对中间包内流动特性的影响主要有三个方面：(1)减小了死体积的程度；（ii）将液体流均匀地分配到每条钢条上；（iii）缩短钢包转换操作期间的混合时间。
Quantified residence-time distribution (RTD) provides a numerical characterization of mixing in the continuous casting tundish-thus allowing the engineer to better understand the metallurgical performance of the reactor. This study describes a computational fluid dynamic (CFD) modeling study for analyzing the flow pattern and the residence-time distribution in a five-strand tundish. Two passive scalar-transport equations were applied to separately calculate the E-curve and F-curve in the tundish. The numeric modeling result were compared to water-modeling results to validate the mathematical model. The volume fraction of different flow regions (plug, mixed and dead) and the intermixing time during the ladle changeover were calculated to study the effects of the flow control device (FCD) on the tundish performance. From the results of CFD calculations, it can be stated that a combination of the U-baffle with deflector holes and the turbulence inhibitor had three major effects on the flow characteristics in the tundish: (i) to reduce the extent of the dead volume; (ii) to evenly distribute the liquid streams to each strand and (iii) to shorten the intermixing time during the ladle changeover operation.