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

Ni, Peiyuan; Wang, Dongxing; Jonsson, Lage; Ersson, Mikael; Zhang, Ting‐an; Jönsson, Pär G.

doi:10.1007/s11663-017-1057-y

Cited by 22 publications

(35 citation statements)

References 45 publications

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“…Furthermore, the predictions have been validated by water model experiments. [42] The inlet steel flow rate is 5.0 m 3 /h. The steel density and its molecular viscosity are 7000 kg/m 3 and 0.0064 kg/(m s), respectively.…”

Section: Model Descriptionmentioning

confidence: 99%

“…The other model information can be found in the literature [42] and is not repeated here. The inclusion tracking was done using the discrete phase model, which is available in the commercial software ANSYS FLUENT 17.0 Ò .…”

Section: Model Descriptionmentioning

confidence: 99%

“…This means that the buoyancy force was not high enough to keep these inclusions in the upper region. This is due to a large steel flow velocity at the top tundish region, with the value of around 0.7 m/s, [42] which also leads to a strong mixing. This strong rotational flow provides the required momentum for an intensive swirling flow later in the SEN.…”

Section: A Inclusion Motion In the Tundishmentioning

confidence: 99%

“…This is due to the centripetal effect, the buoyancy effect, and the upward steel flow in the center of the swirling flow SEN, as shown in a previous study. [42] In the simulations, Al 2 O 3 inclusions have half the density of molten steel. However, in reality, it is difficult to find particles with a density that is just half of water's density.…”

Section: A Inclusion Motion In the Tundishmentioning

confidence: 99%

“…Furthermore, the numerical model was validated by particle image velocimetry measurements in water model experiments. [42] In addition, the turbulent boundary layer was also resolved. Specifically, the y + value of the first grid layer was smaller than 1, and 21 layers of grid cells were used at the near-wall region to account for the turbophoresis effect for particle transport in the turbulent boundary layer.…”

Section: Introductionmentioning

confidence: 99%

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A Study on the Nonmetallic Inclusion Motions in a Swirling Flow Submerged Entry Nozzle in a New Cylindrical Tundish Design

Ersson

Jonsson

et al. 2017

Metall Mater Trans B

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PEIYUAN NI, MIKAEL ERSSON, LAGE TORD INGEMAR JONSSON, and PÄ R GÖ RAN JÖ NSSONDifferent sizes and shapes of nonmetallic inclusions in a swirling flow submerged entry nozzle (SEN) placed in a new tundish design were investigated by using a Lagrangian particle tracking scheme. The results show that inclusions in the current cylindrical tundish have difficulties remaining in the top tundish region, since a strong rotational steel flow exists in this region. This high rotational flow of 0.7 m/s provides the required momentum for the formation of a strong swirling flow inside the SEN. The results show that inclusions larger than 40 lm were found to deposit to a smaller extent on the SEN wall compared to smaller inclusions. The reason is that these large inclusions have Separation number values larger than 1. Thus, the swirling flow causes these large size inclusions to move toward the SEN center. For the nonspherical inclusions, large size inclusions were found to be deposited on the SEN wall to a larger extent, compared to spherical inclusions. More specifically, the difference of the deposited inclusion number is around 27 pct. Overall, it was found that the swirling flow contains three regions, namely, the isotropic core region, the anisotropic turbulence region and the near-wall region. Therefore, anisotropic turbulent fluctuations should be taken into account when the inclusion motion was tracked in this complex flow. In addition, many inclusions were found to deposit at the SEN inlet region. The plotted velocity distribution shows that the inlet flow is very chaotic. A high turbulent kinetic energy value of around 0.08 m 2 /s 2 exists in this region, and a recirculating flow was also found here. These flow characteristics are harmful since they increase the inclusion transport toward the wall. Therefore, a new design of the SEN inlet should be developed in the future, with the aim to modify the inlet flow so that the inclusion deposition is reduced.

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Section: Model Descriptionmentioning

confidence: 99%

Section: Model Descriptionmentioning

confidence: 99%

Section: A Inclusion Motion In the Tundishmentioning

confidence: 99%

Section: A Inclusion Motion In the Tundishmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Study on the Nonmetallic Inclusion Motions in a Swirling Flow Submerged Entry Nozzle in a New Cylindrical Tundish Design

Ersson

Jonsson

et al. 2017

Metall Mater Trans B

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Physical Simulations of Macromixing Conditions in One‐Strand Tundish during Unsteady Period of Continuous Slab Casting Sequence

Cwudziński

Jowsa

Gajda

2020

steel research int.

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The tundish as a flow reactor has a special feature, that is, the liquid metal stays in its working capacity for a certain period of time before it enters the mold. This time is effectively used to correct the chemical composition of cast steel. The object of investigation is the wedge‐type tundish, being a component of the continuous casting slab machine. According to the criterion of similarity, the glass model of the tundish is built to a 0.4 linear scale. A tracer is fed into water using the pulse‐step method. During the casting sequences, the time for starting the alloying process, the depth of immersion of the ladle shroud, and the location of feeding the alloy addition change. On the basis of the recorded tracer concentration curves, the mixing time is calculated between the start of feeding the marker to the water and obtaining the required level of chemical homogenization in the water flowing out of the tundish model. Based on the conducted experiments, it is stated that mixing time depends on feeding positions, time of feeding initialization, and hydrodynamic conditions in the tundish during particular stages of the casting sequence.

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

Cited by 22 publications

References 45 publications

A Study on the Nonmetallic Inclusion Motions in a Swirling Flow Submerged Entry Nozzle in a New Cylindrical Tundish Design

A Study on the Nonmetallic Inclusion Motions in a Swirling Flow Submerged Entry Nozzle in a New Cylindrical Tundish Design

Physical Simulations of Macromixing Conditions in One‐Strand Tundish during Unsteady Period of Continuous Slab Casting Sequence

A Review on Swirling Flow Casting Technology in Steel Production

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