Modelling of Inclusion Motion and Flow Patterns in Swirling Flow Tundishes with Symmetrical and Asymmetrical Structures

Hou, Qinfu; Yue, Qiang; Wang, Huanyang; Zou, Zongshu; Yu, Aibing

doi:10.2355/isijinternational.48.787

Cited by 25 publications

(14 citation statements)

References 22 publications

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“…[16,17] However, these aspects have been ignored in previous studies. [32][33][34]39] In the absence of resolving the turbulence boundary layer, inclusions may simply fly to the wall once they reach the wall-adjacent grid cell. Therefore, this cannot give a good prediction on the inclusion transport toward a wall when particle depositions in turbulent flows occur.…”

Section: Introductionmentioning

confidence: 99%

“…It was found that large size light nonmetallic inclusions move toward the swirling flow center, due to the centripetal separation effect. [34] Hou et al [39] investigated the inclusion removal in a swirling flow chamber, which was installed at the tundish inlet region. It was found that this design is suitable to use for the removal of 20-lm inclusions but not large size inclusions, compared to a conventional tundish.…”

Section: Introductionmentioning

confidence: 99%

“…It was found that this design is suitable to use for the removal of 20-lm inclusions but not large size inclusions, compared to a conventional tundish. [39] However, these simulation studies were carried out using swirling flow fields, which were solved by using the k-e type turbulence model in combination with a standard wall function. [32][33][34]39] Thereafter, a Lagrangian particle tracking scheme was used to describe the inclusion motion in the solved flow fields.…”

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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…Presently, the liquid metal as prepared on the ladle furnace stand has the required metallurgical purity and temperature allowing it to be cast by the continuous method. However, a number of interesting research works concerning tundishes have drawn the metallurgists' attention to this plant and contributed to perceiving the tundish also as an effective device assisting the liquid steel refining processes (Solorio-Diaz et al, 2005;Lopez-Ramirez et al, 2001;Hou et al, 2008;Bessho et al, 1992;Kuklev et al, 2004;Cwudziński, 2010). This results primarily from the fact that liquid steel resides in the tundish for a specific time, during which any phenomena that favour the refining process can be stimulated and intensified.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Influence of Changing a Dam Height on Liquid Steel Flow and Behaviour of Non-metallic Inclusions in the Tundish

Cwudziński¹

2011

Computational Fluid Dynamics Technologies and Applications

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“…They concluded that Lagrangian formulation provides better physics as compared to Eulerian approach. Hou et al [6] developed physical and mathematical methods for a swirling flow tundish and concluded that such tundishes have higher capacity for the inclusion removal as compared to that of a tundish equipped with turbulence inhibitors. Gang et al [7] performed water modeling experiments and concluded that a tundish equipped with dam and turbulence inhibitors has a significant effect on the inclusion separation.…”

Section: Introductionmentioning

confidence: 99%

Performance Optimization of a Six-Strand Tundish

Gupta¹,

Dewan²

2013

WJM

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The aims of the present study are to predict and improve inclusion separation capacity of a six strand tundish by employing flow modifiers (dams and weirs) and to assess the influence of inclusion properties (diameter and density) together with velocity of liquid steel at the inlet gate on the inclusion removal efficiency of a six-strand tundish. Computational solutions of the Reynolds-Averaged Navier-Strokes (RANS) equations together with the energy equation are performed to obtain the steady, three-dimensional velocity and temperature fields using the standard k-ε model of turbulence. These flow fields are then used to predict the inclusion sepapration by numerically solving the inclusion transport equation. To account for the effects of turbulence on particle paths a discrete random walk model is employed. It was observed that with the employment of flow modifiers, the inclusion separation capacity of tundish increases without any large variation in the outlet temperatures. It is shown that inclusion properties and velocity are important parameters in defining the operating conditions of a six-strand tundish.

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Modelling of Inclusion Motion and Flow Patterns in Swirling Flow Tundishes with Symmetrical and Asymmetrical Structures

Cited by 25 publications

References 22 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

Numerical Simulation of Influence of Changing a Dam Height on Liquid Steel Flow and Behaviour of Non-metallic Inclusions in the Tundish

Performance Optimization of a Six-Strand Tundish

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