Transient Two-Phase Flow in Slide-Gate Nozzle and Mold of Continuous Steel Slab Casting with and without Double-Ruler Electro-Magnetic Braking

Cho, Seong Mook; Thomas, Brian G.; Kim, Seon Hyo

doi:10.1007/s11663-016-0752-4

Cited by 37 publications

(48 citation statements)

References 33 publications

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“…Therefore, in recent years, the use of Electromagnetic Braking in the mold to PEIYUAN control the outlet flow from SEN ports has been investigated as a measure to stabilize the steel flow. [19,[24][25][26] This method has shown the ability to stabilize the steel flow at the mold surface region for small level fluctuations. [19,26] However, its application relies on costly equipment and also requires the consumption of electricity.…”

Section: Introductionmentioning

confidence: 99%

“…[19,[24][25][26] This method has shown the ability to stabilize the steel flow at the mold surface region for small level fluctuations. [19,26] However, its application relies on costly equipment and also requires the consumption of electricity. Furthermore, it is sometimes difficult to use this method to accurately control the flow pattern in a mold, since the original upstream flow from the SEN port is unknown.…”

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%

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

View full text Add to dashboard Cite

show abstract

“…Transient models can reveal deeper insights into the fundamental nature of the chaotic turbulent flow and electromagnetic effects. For example, Figure and 9 compare the surface velocities and level profiles measured in a typical slab caster with argon gas, both with and without double‐ruler EMBr . The LES model predictions agree well with nailbaord measurements in the operating caster.…”

Section: Fluid Flow Modelingmentioning

confidence: 63%

“…In this approach, it is easy to account for the molten steel displacing the slag layer, which can amplify the level changes . However, this effect is usually small relative to simple rising and falling of the slag with level fluctuations, so the slag layer can be ignored when estimating level fluctuations …”

Section: Fluid Flow Modelingmentioning

confidence: 99%

“…When flow from the slide gate bounces across to the inside‐radius side of the nozzle, and thus exits the ports with a counter‐clockwise swirl, some of its momentum is lost, the jets deflect more toward the outer radius of the mold, so the surface velocity a short time later is a little slower and the level fluctuations are smaller. The EMBr field of the upper ruler across the nozzle lessens the amount of flipping between swirl patterns exiting the ports, leading to more stable jet flow with less fluctuations in both surface velocity and level …”

Section: Fluid Flow Modelingmentioning

confidence: 99%

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Review on Modeling and Simulation of Continuous Casting

Thomas

2017

steel research int.

Self Cite

183

115

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Continuous casting is a mature, sophisticated technological process, used to produce most of the world's steel, so is worthy of fundamentally-based computational modeling. It involves many interacting phenomena including heat transfer, solidification, multiphase turbulent flow, clogging, electromagnetic effects, complex interfacial behavior, particle entrapment, thermal-mechanical distortion, stress, cracks, segregation, and microstructure formation. Furthermore, these phenomena are transient, three-dimensional, and operate over wide length and time scales. This paper reviews the current state of the art in modeling these phenomena, focusing on practical applications to the formation of defects. It emphasizes model verification and validation of model predictions. The models reviewed range from fast and simple for implementation into online model-based control systems to sophisticated multiphysics simulations that incorporate many coupled phenomena. Both the accomplishments and remaining challenges are discussed.

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Large Eddy Simulation on the Two‐Phase Flow in a Water Model of Continuous Casting Strand with Gas Injection

Chen

Ren

Zhang

2018

steel research int.

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The Large Eddy Simulation (LES) turbulent model coupled with VOF multiphase model and Lagrangian Discrete Phase Model (DPM) is applied to investigate the gas–liquid two‐phase flow and bubble distribution. The drag force, lift force, virtual mass force, and pressure gradient force are incorporated in the current developed model, and the lift force is added via user defined subroutine. The influence of the drag force, the lift force, bubble size, and gas flow rate on the distribution of bubbles and flow field are investigated. The PIV measurements are employed to validate the mathematical model. The results show that the gas injection can affect the flow field and bubble behavior directly. The impingement point on the narrow face and vortex core of the upper recirculation zone moves upward with the increase of gas flow rate. The drag force has distinct influences on the bubble distribution and flow field. The interaction induced by the lift force cannot be ignored. Without the consideration of the lift force, a larger flow velocity will be predicted. Moreover, the lift force has significant effect on the bubble distribution at mold thickness direction, especially the larger bubbles.

show abstract

Transient Two-Phase Flow in Slide-Gate Nozzle and Mold of Continuous Steel Slab Casting with and without Double-Ruler Electro-Magnetic Braking

Cited by 37 publications

References 33 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

Review on Modeling and Simulation of Continuous Casting

Large Eddy Simulation on the Two‐Phase Flow in a Water Model of Continuous Casting Strand with Gas Injection

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