Effect of swirling flow tundish submerged entry nozzle outlet design on multiphase flow and heat transfer in mould

Bai, Haitong; Ni, Peiyuan; Ersson, Mikael; Zhang, Ting‐an; Jönsson, Pär G.

doi:10.1080/03019233.2019.1630215

Cited by 11 publications

(5 citation statements)

References 32 publications

(56 reference statements)

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“…In further reports, [57,59] influences of nozzle structure and immersion depth on mold flow pattern were also investigated. It was found that compared with a straight nozzle, a divergent nozzle can make the steel-slag interface more stale, but the removal of the steel superheat was slightly reduced.…”

Section: Swirling Flow Tundish Technologymentioning

confidence: 99%

“…It was found that compared with a straight nozzle, a divergent nozzle can make the steel-slag interface more stale, but the removal of the steel superheat was slightly reduced. [59] The increase in SEN immersion depth can decrease the meniscus velocity as well as the probability of mold flux entrainment. [57] Recently, a new swirling flow generator design in tundish was developed to generate swirling flow in SEN, as shown in Figure 16.…”

Section: Swirling Flow Tundish Technologymentioning

confidence: 99%

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A Review on Swirling Flow Casting Technology in Steel Production

Xie

Nabeel

Ersson

et al. 2021

steel research int.

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Casting is the final step of steel from liquid to solid state with a decreased steel temperature, where some complex phenomena occur in casting mold, as shown in Figure 1, [1] such as multiphase flow, heat transfer, phase transition, solute redistribution, and so on. During solidification process, some defects of steel semi-product like cracks and macrosegregation can form, which can significantly deteriorate steel mechanical properties. These defects normally are difficult to be completely removed in a subsequent heat treatment process. Therefore, a good control on steel solidification process is of great significance for both steel quality and casting efficiency.Steel casting includes two routes, namely continuous casting and ingot casting. According to statistics from World Steel Association, the global output of crude steel in 2020 is around 1.878 billion tons, over 96.9% of which is produced through continuous casting process. [2] Therefore, continuous casting has become the main process in global steel production. However, ingot casting is still used today to produce, for example, some high-alloyed steel, large size round bloom, and so on, which also plays an important role in production of some steel categories. In past years, steel casting process especially continuous casting has made enormous progress. These are realized by optimizing the submerged entry nozzle (SEN) structure, [3][4][5] casting speed, [6][7][8] argon blowing in nozzle, [9][10][11] electromagnetic braking, [12][13][14] mold electromagnetic stirring (M-EMS), [15][16][17] second-cooling segment electromagnetic stirring (S-EMS), [18][19][20] final electromagnetic stirring (F-EMS), [21][22][23] and so on. To further improve the steel flow field in mold, as early as 1994, Yokoya et al. [24] first proposed the swirling flow nozzle casting technology, which aims to induce a rotational steel flow inside SEN. This rotational flow momentum can change SEN outlet flow pattern to avoid the formation of a jet flow in mold that is commonly observed in the case of the straight nozzle continuous casting. [24] Furthermore, it can also promote a uniform flow on the cross-section of SEN side port. Therefore, the mold flow pattern can be optimized as soon as steel moves into the mold. Plant trials have confirmed that this technology can effectively improve the quality of steel semi-product and alleviate the SEN side-port clogging in continuous casting. [25] In recent years, the swirling flow nozzle casting technology has attracted worldwide attention. A great number of studies have been carried out, as shown in Table 1, and these studies will be comprehensively introduced in Section 2 and 3 in this paper, including different realization technologies, main findings, and metallurgical effects. This aims to promote the understanding of multiphysical phenomena induced by the swirling flow. Also, new technology development and research progress on swirling flow steel casting will be summarized. Swirling Flow Continuous Casting Swirl Blade TechnologyIn 1994, Yoko...

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Section: Swirling Flow Tundish Technologymentioning

confidence: 99%

Section: Swirling Flow Tundish Technologymentioning

confidence: 99%

A Review on Swirling Flow Casting Technology in Steel Production

Xie

Nabeel

Ersson

et al. 2021

steel research int.

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the following decades, various swirling flow processes were developed, which can be divided into two main types based on the swirling flow generation approach. The first type involves generating a swirling flow driven by the joint effect of the gravitational potential energy of the liquid steel at entry and flow guidance devices with specific geometries [11,12]. Yue [13] and Hou et al [14] proposed setting a cylindrical chamber in the stream zone of a tundish to convert the gravitational potential energy into the kinetic energy of rotational flow.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on a new swirling flow pocket brick for tundish upper nozzle during continuous casting of steel

Qin,

Cheng,

et al. 2023

Ironmaking & Steelmaking

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In this study, a new, simple-structured swirling flow pocket brick (SFPB) equipped on the upper nozzle of a tundish is proposed. Numerical simulations are performed to investigate the effect of the SFPB on the liquid steel flow in the tundish and nozzle in comparison with that in a conventional tundish. The results indicate that the SFPB can reduce the dead volume fraction, increase the mixed flow volume with low risk of slag entrapment in the tundish, and generate a swirling flow in the nozzle. As the distance from the nozzle inlet increases, the swirling velocity decreases and the static pressure in the nozzle section increases. A higher velocity and static pressure are recorded in the near-wall region at the upper part of the nozzle, where the turbulent kinetic energy decreases significantly from 0.037 m 2 s −2 in a conventional tundish nozzle to 0.013 m 2 s −2 in the proposed SFPB tundish..

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“…[4,5] The flow of steel in the mould can be improved or aggravated by adjusting nozzle characteristics such as the number of ports, port angles, and immersion depth of the submerged entry nozzle (SEN). [6,7] The functions of the SEN include preventing liquid steel from spattering and improving the billet temperature and flow-field distribution. [8,9] Zhang et al [10] studied the effect of SEN-type on flow, heat transfer, and solidification in the mould and found that the shell thickness of the straight SEN was the thickest in the mould zone but became thinner beyond 0.9 m from the meniscus.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nozzle Position on Fluid Flow and Solidification in a Billet Curved Mould using Mould Electromagnetic Stirring

Wang

Qiu

Zhu

et al. 2023

steel research int.

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Owing to the smaller cross-sectional size of the billet, the effect of the position of the submerged entry nozzle (SEN) on the fluid flow in a curved mold is more prominent. The transient fluid flow, heat transfer, and solidification behavior at different nozzle positions and mold electromagnetic stirring (M-EMS) are investigated using a 3D transient mathematical model. The symmetry index, S, is introduced to quantitatively evaluate the symmetry of the flow field. When the SEN is offset to the outer curve, S is the highest, the flow field mixing is the best, and the liquid level fluctuation is minimal. When the SEN is offset to the inner curve, S is the lowest, and the washing of the solidified shell on the inner curve side is more significant, causing the solidified shell thickness on the inner curve to be thinner, which can easily cause steel breakout accidents. The M-EMS can improve the uneven flow field caused by the nozzle position. In actual production, the SEN can be appropriately offset to the outer curve, and the application of M-EMS can improve the flow field distribution of molten steel.

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Effect of swirling flow tundish submerged entry nozzle outlet design on multiphase flow and heat transfer in mould

Cited by 11 publications

References 32 publications

A Review on Swirling Flow Casting Technology in Steel Production

A Review on Swirling Flow Casting Technology in Steel Production

Numerical study on a new swirling flow pocket brick for tundish upper nozzle during continuous casting of steel

Effect of Nozzle Position on Fluid Flow and Solidification in a Billet Curved Mould using Mould Electromagnetic Stirring

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