Effects of Electromagnetic Swirling Flow in Submerged Entry Nozzle on Square Billet Continuous Casting of Steel Process

Li, Dewei; Su, Zhijian; Chen, Jin; Wang, Qiang; Yang, Ying; Nakajima, Keiji; Marukawa, Katsukiyo; He, Jicheng

doi:10.2355/isijinternational.53.1187

Cited by 39 publications

(39 citation statements)

References 13 publications

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“…[27,28] In addition, previous studies show that a strong swirling steel flow can be obtained in the SENs and in molds. [27][28][29][30][31][32][33][34][35] This means that the technologies for a swirling flow in the SENs has the potential to replace the electromagnetic stirring in molds. [10,11,36,37] The swirling flow inside the SEN was probably first proposed by Yokoya et al [29] in 1994.…”

Section: Introductionmentioning

confidence: 99%

“…Thereafter, many studies have been carried out to investigate the steel flow phenomena in molds, for both the slab and the billet casting, using a swirling flow in SENs. [27][28][29][30][31][32][33][34][35] This is a way to control the steel flow in molds in a root manner by optimizing the SEN port flow with a rotational velocity component. Overall, two methods have mainly been investigated to produce a swirling flow in SENs.…”

Section: Introductionmentioning

confidence: 99%

“…The first method is the swirl blade method, [27][28][29][30][31][32][33] i.e., by installing a swirl blade inside the nozzle. The other one is the electromagnetic stirring method, [34,35] which is realized by installing an electromagnetic stirring equipment outside the SEN. The swirl blade method is an energy-saving method, which uses the head difference between the steel in tundish and that in the mold to produce the required power.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and Physical Study on a Cylindrical Tundish Design to Produce a Swirling Flow in the SEN During Continuous Casting of Steel

Wang

Jonsson

et al. 2017

Metall Mater Trans B

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A new tundish design was investigated using both water model experiments and numerical simulations. The results show that the Reynolds Stress Model simulation results agree well with the Particle Image Velocimetry-measured results for water model experiments. A strong swirling flow in the Submerged Entry Nozzle (SEN) of the new tundish was successfully obtained, and the tangential velocity in the region near SEN inlet could reach a value of around 3.1 m/s. A high value of the shear stress was found to exist on the SEN wall, due to the strong swirling flow inside the SEN. This large shear stress leads to the dissipation of the rotational momentum of the steel flow. Thus, the maximum tangential velocity of the steel flow decreases from 3.1 m/s at around the SEN inlet to 2.2 m/s at a location close to the SEN outlet. In addition, the near-wall region has a high pressure, which is larger than the atmospheric pressure, due to the centrifugal effect. The calculated swirl number, with the value of around 1.6 at SEN inlet, illustrates that the current design can produce a similar strong swirling flow compared to the swirl blade method and the electromagnetic stirring method, while this is obtained by simply changing the steel flow path in tundish instead of using additional device to influence the flow.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical and Physical Study on a Cylindrical Tundish Design to Produce a Swirling Flow in the SEN During Continuous Casting of Steel

Wang

Jonsson

et al. 2017

Metall Mater Trans B

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“…In earlier research, it has been shown that a swirl flow helps to control a flow pattern in a mold. Consequently, it was acknowledged that a swirl flow enhances the heat and mass transfer and improves the superheat dissipation in a melt.…”

Section: Introductionmentioning

confidence: 99%

Inclusion Behavior under a Swirl Flow in a Submerged Entry Nozzle and Mold

Yang

Jönsson

Ersson

et al. 2015

steel research int.

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Previous studies have verified that a swirl flow generated in a submerged entry nozzle (SEN) can effectively improve a flow pattern and a heat transfer in a continuous casting (CC) process. In order to obtain a further in‐depth understanding with respect to the effect of a swirl flow on a CC process, the inclusion behavior in a SEN and a mold was studied in the present work. The flow field and the temperature field of molten steel as well as the inclusion behavior in a SEN and a square bloom mold were simulated under the influence of a rotating electromagnetic field (swirl generator). Also, the influence of different inclusion parameters such as the densities, sizes, and boundary conditions, on the inclusion behavior was studied. The results show that a flow pattern in a SEN can be characterized into three distinct flow regions: an accelerating flow of molten steel from an electromagnetic swirl flow generator (EMSFG) inlet to an EMSFG center, a decelerating flow of molten steel from an EMSFG center to an EMSFG outlet, and a recirculation flow of molten steel from an EMSFG outlet to an SEN outlet. In addition, it was found that light Al2O3 inclusion moves towards the rotational center by a centrifugal force, and that a swirl flow prevents nozzle clogging. Moreover, it was also found that the inclusion separation to a mold meniscus increased and that the inclusions trapped into a solidified shell wall decreased when using a swirl flow.

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“…25,26,28,29,31,32) The swirling flow is obtained by installing the electromagnetic stirring equipment outside the SEN. Simulation results 25,29,31,32) showed that it can produce a good swirling flow inside the SEN. However, it requires an equipment cost and an electricity cost.…”

Section: )mentioning

confidence: 99%

Application of a Swirling Flow Producer in a Conventional Tundish during Continuous Casting of Steel

Jonsson

Ersson

et al. 2017

ISIJ Int.

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A swirling flow producer was designed for a conventional tundish in order to produce a swirling flow in the SEN driven by the steel flow potential. CFD simulations were carried out to investigate the flow phenomena in the new tundish system. The results show that a swirling flow in the tundish SEN was successfully obtained. The swirl number of the obtained steel flow inside the SEN can reach a value of 1.34, with a tangential velocity of around 2.8 m/s. The possibility of slag entrainment at the top of the tundish was estimated by analyzing the steel flow characteristics near the top surface. The calculated Weber Number is around 0.3 outside the cylinder, which indicates a low possibility of slag entrainment. A high value of shear stress was found on the SEN wall. This is due to the rotational steel flow in SEN. Also, non-metallic inclusions were tracked in the fully developed steel flow field. It was found that the number of inclusions that touch the top surface increases with an increased inclusion size. Small size inclusions mainly move into the cylinder from the left side of tangential inlet. Therefore, methods like installing a dam at the tundish bottom may be helpful to change the inclusion trajectories to move towards the top of the tundish.

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Effects of Electromagnetic Swirling Flow in Submerged Entry Nozzle on Square Billet Continuous Casting of Steel Process

Cited by 39 publications

References 13 publications

Numerical and Physical Study on a Cylindrical Tundish Design to Produce a Swirling Flow in the SEN During Continuous Casting of Steel

Numerical and Physical Study on a Cylindrical Tundish Design to Produce a Swirling Flow in the SEN During Continuous Casting of Steel

Inclusion Behavior under a Swirl Flow in a Submerged Entry Nozzle and Mold

Application of a Swirling Flow Producer in a Conventional Tundish during Continuous Casting of Steel

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