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Numerical Simulation of Transient Multiphase Flow in a Five-Strand Bloom Tundish during Ladle Change

1
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2
Valin Xiangtan Iron and Steel Co., Ltd., Xiangtan 411101, China
*
Author to whom correspondence should be addressed.
Metals 2018, 8(2), 146; https://doi.org/10.3390/met8020146
Received: 30 December 2017 / Revised: 8 February 2018 / Accepted: 13 February 2018 / Published: 23 February 2018
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Abstract

The steel-slag-air multiphase flow in a bloom tundish with five strands during the transient casting of the ladle change was simulated using the Volume of Fluid (VOF) model, and the formation mechanisms of macro-inclusions and the behavior of the steel-slag-air interface during the filling process were investigated. Water model experiments were conducted to validate the multiphase model. The results showed that the numerical results of slag entrapment behavior and the exposed area of steel are basically consistent with the experimental results. The flow of molten steel in the tundish is weak except for the region around the stopper rods at the end of the emptying process. Strong fluctuations in liquid level were formed during the filling process, showing two wave crests in front of and behind the shroud in the impact zone, which intensified with the increase in filling time and then declined gradually. Entrapment phenomena and exposure of liquid steel could not be observed before the filling stage. While the entrapped slag droplets mostly float up and can be removed within 40 s during the filling process, the remainder enters the casting zone through the baffle. The maximum exposed area of molten steel is 252 cm2 when the filling time is 4.0 s. View Full-Text
Keywords: tundish; ladle change; numerical simulation; multiphase VOF model; transient flow tundish; ladle change; numerical simulation; multiphase VOF model; transient flow
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Zhang, H.; Luo, R.; Fang, Q.; Ni, H.; Song, X. Numerical Simulation of Transient Multiphase Flow in a Five-Strand Bloom Tundish during Ladle Change. Metals 2018, 8, 146.

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