Numerical Simulation of the Effects of Horizontal and Vertical EMBr on Jet Flow and Mold Level Fluctuation in Continuous Casting

Xu, Lin; Wang, Engang; Karcher, Christian; Deng, Anyuan; Xu, Xiujie

doi:10.1007/s11663-018-1342-4

Cited by 28 publications

(23 citation statements)

References 30 publications

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“…vertically near the narrow faces [109][110][111]. The flow velocity up the narrow face is predicted to become slower and more uniform with vertical EMBr [110].…”

Section: Single-ruler Embrmentioning

confidence: 94%

“…As discussed in Sections 3.1 and 3.2, the location of static EMBr fields relative to the jet greatly affects the mold flow pattern. Thus, superheat transport is also influenced strongly by the magnetic field location [103,104,108,109,126,129,130]. Magnetic fields located below the jet deflect flow upwards towards the surface, leading to a hotter meniscus region [103,104], increasing meniscus temperature with increasing field strength, as shown in Figure 18 [104].…”

Section: Static Magnetic Fieldsmentioning

confidence: 98%

“…Vertical single-ruler EMBr, recently proposed, is designed to decrease surface velocity and surface profile variations by imposing two strong static ruler-shaped magnetic fields oriented vertically near the narrow faces [109][110][111]. The flow velocity up the narrow face is predicted to become slower and more uniform with vertical EMBr [110].…”

Section: Single-ruler Embrmentioning

confidence: 99%

“…This is proposed to be useful for high-speed thin-slab mold casting, to avoid excessive surface flow problems. If the flow has a double-roll pattern with a downward jet, then the vertical ruler field is predicted to reduce surface velocity more than a horizontal single-ruler EMBr field [109,110], as shown in Figure 11.…”

Section: Single-ruler Embrmentioning

confidence: 99%

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Electromagnetic Forces in Continuous Casting of Steel Slabs

Cho

Thomas

2019

Metals

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This paper reviews the current state of the art in the application of electromagnetic forces to control fluid flow to improve quality in continuous casting of steel slabs. Many product defects are controlled by flow-related phenomena in the mold region, such as slag entrapment due to excessive surface velocity and level fluctuations, meniscus hook defects due to insufficient transport of flow and superheat to the meniscus region, and particle entrapment into the solidification front, which depends on transverse flow across the dendritic interface. Fluid flow also affects heat transfer, solidification, and solute transport, which greatly affect grain structure and internal quality of final steel products. Various electromagnetic systems can affect flow, including static magnetic fields and traveling fields which actively accelerate, slow down, or stir the flow in the mold or strand regions. Optimal electromagnetic effects to control flow depends greatly on the caster geometry and other operating conditions. Previous works on how to operate electromagnetic systems to reduce defects are discussed based on results from plant experiments, validated computational models, and lab scale model experiments.

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“…vertically near the narrow faces [109][110][111]. The flow velocity up the narrow face is predicted to become slower and more uniform with vertical EMBr [110].…”

Section: Single-ruler Embrmentioning

confidence: 94%

Section: Static Magnetic Fieldsmentioning

confidence: 98%

Section: Single-ruler Embrmentioning

confidence: 99%

Section: Single-ruler Embrmentioning

confidence: 99%

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Electromagnetic Forces in Continuous Casting of Steel Slabs

Cho

Thomas

2019

Metals

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“…This new application is close to the narrow mold faces. It is called vertical-EMBr [32,33], which has been applied even jointly with the longitudinal-EMBr [34], yielding excellent metallurgical results in conventional slab molds. Because of the successful results in conventional casters, this technology is applied in thin slab molds.…”

Section: Introductionmentioning

confidence: 99%

Modeling Study of EMBr Effects on the Detrimental Dynamic Distortion Phenomenon in a Funnel Thin Slab Mold

et al. 2020

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The turbulent phenomena occurring in the thin slab mold affect the final product quality. Therefore, it is essential to carry out studies to understand and control their occurrence. Current research aims to study the electromagnetic brake (EMBr) effects on the flow patterns in a funnel thin slab mold. The objective is to prevent the detrimental phenomenon known as dynamic distortions (DD) of the flow, applying the EMBr in the typical horizontal position (H-EMBr) and a new vertical position close to the narrow faces (V-EMBr). The fluid dynamics are simulated using the Reynolds stress model (RSM), the Volume of Fluid (VOF) model and the Maxwell equations in their magnetohydrodynamics (MHD) simplification. The results show that the H-EMBr effectively counteracts the DD phenomenon by reducing the submerged entry nozzle (SEN) ports' mass flow rate differences. The EMBr reduces the highest meniscus fluctuations from −10 to ±3 mm with a field intensity of 0.1T and almost 0 mm for higher field intensities. In contrast, the V-EMBr configuration does not reduce or control at all the DD phenomenon, even though eliminating the upper roll flows does not diminish the meniscus fluctuation amplitudes and induces new small roll flows close to the SEN's wall.

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Numerical Simulation of Flow Field, Distribution of Bubbles, and Inclusions in Slab Continuous Casting Mold under Electromagnetic Braking Assisted with High‐Temperature Quantitative Velocity Measurement

Li,

He,

Zhao

et al. 2024

steel research int.

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The numerical simulation is combined with high‐temperature measurement to study the effects of electromagnetic braking (EMBr) and casting speed on the flow field, the fluctuation of the interface of the steel and slag, the distribution of argon gas bubbles, and the removal ratios of inclusions in the mold with a size of 1050 × 230 mm. The numerical simulation results and the high‐temperature measurement results of the velocities of molten steel at the 1/4 width and center of the thickness near the mold surface are in good agreement. The EMBr can reduce the velocity near the mold surface, the fluctuation of the interface between steel and slag, and the number of argon gas bubbles near narrow walls and decrease the total removal ratio of inclusions from 27.29 to 23.24%. When the casting speed is increased from 1.6 to 2.0 m min−1 with EMBr, the velocity of molten steel near the mold surface is increased. Even under the condition of a high casting speed of 2.0 m s−1, the velocity of molten steel near the surface is still in a reasonable range with EMBr. The total removal ratio of inclusions increases from 20.76 to 23.90%.

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Numerical Simulation of the Effects of Horizontal and Vertical EMBr on Jet Flow and Mold Level Fluctuation in Continuous Casting

Cited by 28 publications

References 30 publications

Electromagnetic Forces in Continuous Casting of Steel Slabs

Electromagnetic Forces in Continuous Casting of Steel Slabs

Modeling Study of EMBr Effects on the Detrimental Dynamic Distortion Phenomenon in a Funnel Thin Slab Mold

Numerical Simulation of Flow Field, Distribution of Bubbles, and Inclusions in Slab Continuous Casting Mold under Electromagnetic Braking Assisted with High‐Temperature Quantitative Velocity Measurement

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