Experimental Investigations of Rotary Electromagnetic Mould Stirring in Continuous Casting Using a Cold Liquid Metal Model

Willers, B.; Barna, Martin; Reiter, Jürgen; Eckert, Sven

doi:10.2355/isijinternational.isijint-2016-495

Cited by 23 publications

(18 citation statements)

References 21 publications

(21 reference statements)

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“…However, a flat interface is generally observed in this study. In the case with M-EMS, the level fluctuation was also found to be increased [10,33,64]. The meniscus surface has a swirl flow and the meniscus level rises near the bloom strand wall and sinks around the SEN wall, which shows an inclined steel/slag interface [33].…”

Section: Steel/slag Interface Phenomenamentioning

confidence: 90%

“…The meniscus surface has a swirl flow and the meniscus level rises near the bloom strand wall and sinks around the SEN wall, which shows an inclined steel/slag interface [33]. Sometimes, a vortex formation near the SEN wall was found with M-EMS [64]. Therefore, the mold level fluctuation should be considered to make it as low as possible, both for M-EMS applications and for the use of swirling flow SEN. Figure 10 shows the distributions of the velocity magnitude and turbulent kinetic energy along the steel/slag interface.…”

Section: Steel/slag Interface Phenomenamentioning

confidence: 99%

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Numerical Study on the Influence of a Swirling Flow Tundish on Multiphase Flow and Heat Transfer in Mold

Ersson

Jonsson

et al. 2018

Metals

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The effect of a new cylindrical swirling flow tundish design on the multiphase flow and heat transfer in a mold was studied. The RSM (Reynolds stress model) and the VOF (volume of fluid) model were used to solve the steel and slag flow phenomena. The effect of the swirling flow tundish design on the temperature distribution and inclusion motion was also studied. The results show that the new tundish design significantly changed the flow behavior in the mold, compared to a conventional tundish casting. Specifically, the deep impingement jet from the SEN (Submerged Entry Nozzle) outlet disappeared in the mold, and steel with a high temperature moved towards the solidified shell due to the swirling flow effect. Steel flow velocity in the top of the mold was increased. A large velocity in the vicinity of the solidified shell was obtained. Furthermore, the risk of the slag entrainment in the mold was also estimated. With the swirling flow tundish casting, the temperature distribution became more uniform, and the dissipation of the steel superheat was accelerated. In addition, inclusion trajectories in the mold also changed, which tend to stay at the top of the mold for a time. A future study is still required to further optimize the steel flow in mold.

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Section: Steel/slag Interface Phenomenamentioning

confidence: 90%

Section: Steel/slag Interface Phenomenamentioning

confidence: 99%

Numerical Study on the Influence of a Swirling Flow Tundish on Multiphase Flow and Heat Transfer in Mold

Ersson

Jonsson

et al. 2018

Metals

View full text Add to dashboard Cite

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“…In this paper, a large eddy simulation (LES) coupling three‐phase (air, slag, steel) flow, solidification and electromagnetic field is established to investigate the level fluctuation affected by a newly found “distinct flow” . First, by comparisons with the magnetic flux density, surface temperature and growth of solidified shell, the reliability of our mathematical model is proved.…”

Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation of Electromagnetic Three‐Phase Flow in a Round Bloom Considering Solidified Shell

Liu

et al. 2018

steel research int.

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A large eddy simulation (LES) model has been developed to simulate three‐phase flow, heat transfer, and solidification processes under the effect of M‐EMS. Through comparing the magnetic flux density, surface temperature, and growth of solidified shell with experimental results, the reliability of our mathematical model is proved. Results show that the ignorance of solidified shell will overestimate the velocity field and slag‐metal interface fluctuation, therefore the solidified shell should not be ignored. What's more, a distinct flow, which is characterized by a rotary flow from top view, and biased flow from front view, is identified through this model. An upward flow is formed due to this distinct flow, which can explain the imbalance morphology of slag‐metal interface, and the typical tornado‐like shape slag‐metal interface is vividly observed using this model; By contrast, without M‐EMS, the distinct flow can also be found near the injection end, but it makes little effect on the fluctuation of slag‐metal interface. In addition, a new indicator of ΔH is defined to investigate the slag‐metal interface fluctuation, and the deformation of slag layer is also predicted. The mathematical model is helpful for understanding the deformation of slag‐metal interface during bloom casting.

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“…They pointed out that the M-EMS can improve superheat dissipation and weaken the invasion depth of the jet. Unfortunately, to gain a further melt superheat dissipation effect at the lower part of the mold by M-EMS, a strong rotational flow will accordingly be present near the meniscus, which may cause severe level fluctuation [14,15], and then give rise to slag entrapment at the meniscus, especially for the billet CC process [16]. Thus, the dual M-EMS [17,18] was proposed to inhibit the disturbance near the meniscus by generating an opposite stirring mode in the mold cavity.…”

Section: Introductionmentioning

confidence: 99%

Novel Opposite Stirring Mode in Bloom Continuous Casting Mould by Combining Swirling Flow Nozzle with EMS

Sun

Liu

2018

Metals

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The metallurgical performances in a mold cavity were investigated using a conventional bilateral-port nozzle or a swirling flow nozzle (SFN) plus with in-mold electromagnetic stirring (M-EMS) for bloom continuous casting (CC) process. To this end, a coupled model of electromagnetism, flow, and heat transfer was developed. Meanwhile, corresponding plant trials were conducted to evaluate the influence of a melt feeding mode on the internal quality of an as-cast bloom in Shaoguan Steel, China. Under the case of the SFN plus with M-EMS, a novel opposite stirring mode in the bloom CC mold cavity can be observed. A swirling flow in the anti-clockwise direction generated by the SFN, and the other swirling flow in the clockwise direction induced by the M-EMS were formed in regions with distances ranging from 0 m to 0.11 m and 0.218 m to 1.4 m from the meniscus, respectively. As compared to the case of the bilateral-port nozzle plus with M-EMS, the opposite stirring mode in the mold cavity can promote the melt superheat dissipation, improve the casting soundness and the componential homogeneity, inhibit the mold level fluctuation, and also be beneficial to prevent slag erosion for the nozzle external wall at the meniscus. Here, the fluctuation range of carbon segregation along the casting direction is reduced from 0.16 to 0.06, and the magnitude of mold level fluctuation is reduced from 5.6 mm to 2.3 mm under the adoption of SFN plus with M-EMS, respectively.

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Experimental Investigations of Rotary Electromagnetic Mould Stirring in Continuous Casting Using a Cold Liquid Metal Model

Cited by 23 publications

References 21 publications

Numerical Study on the Influence of a Swirling Flow Tundish on Multiphase Flow and Heat Transfer in Mold

Numerical Study on the Influence of a Swirling Flow Tundish on Multiphase Flow and Heat Transfer in Mold

Large Eddy Simulation of Electromagnetic Three‐Phase Flow in a Round Bloom Considering Solidified Shell

Novel Opposite Stirring Mode in Bloom Continuous Casting Mould by Combining Swirling Flow Nozzle with EMS

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