Characterization of Single and Multiphase Hydrodynamics in Continuous Slab Casting Mold in the Presence of Applied Magnetic Field

Sarkar, Sandip; Jatav, Sunil Kumar; Singh, Vikas K.; Ajmani, S. K.

doi:10.1007/s11837-018-3159-7

Cited by 4 publications

(5 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, this method is difficult to deal with the high volume fraction of the dispersed phase. [1] Li et al [36,37] and Sarkar et al [38,39] used the Eulerian-Eulerian method to predict the two-phase flow in the mold with the magnetic field but did not consider the effect of the magnetic resistance force on bubbles. In a word, the previous studies mainly focused on the two-phase flow in the slab mold.…”

Section: Doi: 101002/srin202100848mentioning

confidence: 99%

“…More details for turbulent kinetic energy k and turbulent dissipation ϵ can be found in previous studies. [38,39] The effective viscosity of gas phase is calculated as…”

Section: Continuity Equationmentioning

confidence: 99%

“…More details for turbulent kinetic energy k and turbulent dissipation ϵ can be found in previous studies. [ 38,39 ]…”

Section: Mathematical Modelmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Simulation for Two‐Phase Flow, Heat Transfer, and Inclusion Transport in Bloom Mold Considering the Effects of Argon Gas Injection and Mold Electromagnetic Stirring

Xuan

Chen

2022

steel research int.

View full text Add to dashboard Cite

During the continuous casting process, the fluid flow is a critical factor that affects the heat transfer and the inclusion transport, which, in turn, determines the final quality of steel products. Argon gas injection (AGI) is widely employed to prevent submerged entry nozzle (SEN) clogging in the slab mold. [1,2] After entering the mold, argon bubbles alter the flow pattern, promote inclusion floating, and improve the melting of mold flux. [1][2][3][4] However, a large amount of argon gas can lead to increased level fluctuations, uneven distribution of mold flux, and even slag entrainment. [1,3,5] Moreover, argon bubbles may be captured by the solidified shell and become surface defects. [6,7] Fortunately, the aforementioned negative effects can be reduced by suitable operating parameters and electromagnetic technologies to meet quality requirements. [2,3,[8][9][10] Because of these beneficial effects, AGI is used in the bloom mold of Hebei Iron & Steel Group Hansteel Company, [11] Angang Steel Company Limited, [12] Nanjing Iron and Steel Company Limited [13] to improve the castability of alloy steels that are prone to clogging. However, due to the small cross-sectional area of the bloom mold, surface defects from captured bubbles are more serious. [12] As a widely used electromagnetic technology, mold electromagnetic stirring (M-EMS) can enhance molten steel flow, [14] promote superheat dissipation, [15] and improve the equiaxed crystals ratio, [16] more importantly, it can reduce bubbles captured by the solidified shell in the slab mold [17][18][19] and the bloom mold. [12] Despite these advantages of M-EMS, the double action of M-EMS and AGI may cause more level fluctuations, which has been reported in the slab mold [20] but not in the bloom mold. Therefore, to provide theoretical guidance for quality improvement and AGI application, it is essential to investigate the effects of AGI and M-EMS on fluid flow, temperature distribution, and inclusion removal in the bloom mold.Many experimental researches have been performed to investigate the two-phase flow of molten steel and argon gas in the SEN and mold regions using water models [21][22][23][24][25] and liquid metal models. [26][27][28][29] In the water model, it is easy to capture the twophase flow but difficult to consider the effect of the magnetic field because of the low electrical conductivity of water. Although the liquid metal model can apply the magnetic field, the two-phase flow in the mold is hard to visualize. Thus, numerical simulation is widely used to investigate the two-phase flow in the mold. Several studies investigated the effect of AGI on the flow field, [3,7,[30][31][32][33] temperature distribution, [3,30] initial solidification, [3] inclusion removal, [7,31,33] and slag-steel interfacial behavior, [1,4,5,32]

show abstract

Section: Doi: 101002/srin202100848mentioning

confidence: 99%

“…More details for turbulent kinetic energy k and turbulent dissipation ϵ can be found in previous studies. [38,39] The effective viscosity of gas phase is calculated as…”

Section: Continuity Equationmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Simulation for Two‐Phase Flow, Heat Transfer, and Inclusion Transport in Bloom Mold Considering the Effects of Argon Gas Injection and Mold Electromagnetic Stirring

Xuan

Chen

2022

steel research int.

View full text Add to dashboard Cite

show abstract

“…If the magnetic field intensity was equal to or larger than 0.07 T, a calm and stabilized free surface was achieved and GE was no longer detected. In general, various permanent magnets, such as alnico, samarium cobalt, ferrite, and neodymium, have different intensities of magnetic fields in the range of 0.01-1.2 T. For example, electromagnetism around 0.12-0.32 and 0.25-0.3 T is being applied to the Czochralski crystal growth process 49,50 and the electromagnetic braking (EMBr) in a continuous casting mold, 51,52 respectively. Therefore, the magnetic field intensity of 0.07 T for an MHD stabilizer for the safe operation of SFR seems sufficiently implementable.…”

Section: Numerical Test Of Mhd Stabilizer In Ksfrmentioning

confidence: 99%

Magnetohydrodynamic stabilizer suppressing gas entrainment for safety improvement in a sodium‐cooled fast reactor

Lee

Park

2022

Intl J of Energy Research

View full text Add to dashboard Cite

Summary In a low‐carbon economy, nuclear energy is considered a viable option to meet increased energy demands. Several countries have been developing sodium‐cooled fast reactors (SFRs), which have a highest potential for commercialization among Generation IV reactor systems. However, for SFR's safe operation, the gas entrainment (GE) issue in SFRs should be resolved first. Although many types of free‐surface stabilizers have been studied for preventing GE, any generalized types showing a stable operating performance have not been determined yet. In this study, as a new type of free‐surface stabilizer, we have tested a magnetohydrodynamic (MHD) stabilizer for the Korean‐conceptual SFR. A pair of torus‐type magnets was devised for the MHD stabilizer through parametric‐model studies. The magnetism well alleviated the sources of GE such as the rotating flow and central sink. As a result, a calm free surface was achieved with an 87% reduction in vortex core depth using 0.07 T magnetic field intensity.

show abstract

“…For casting steel with a large section size, its internal porosity and center segregation becomes more serious due to the presence of a coarser casting structure. As a result, the internal defects of continuous casting wide-thick slab and bloom could not be alleviated significantly by conventional methods, such as electromagnetic stirring technology (EMS), [9][10][11][12] soft reduction (SR) technique, [13,14] and so on. To effectively reduce the internal porosity and other internal quality defects in continuous casting steel and thus provide qualified materials for the subsequent forging or rolling process, a heavy reduction (HR) process was proposed.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Microporosities in Wide‐Thick Continuous Casting Slab during Heavy Reduction Process

Zhang

Wu²,

et al. 2022

steel research int.

View full text Add to dashboard Cite

Heavy reduction (HR) is an effective process that can significantly minimize the internal porosity and other internal defects in continuous casting steel. Herein, samples taken from different wide‐thick slab positions are examined by scanning acoustic microscopy and 3D reconstructed. The morphology and distribution of microporosities <1 mm in size in the wide‐thick slab are revealed. The microporosities are mainly distributed in a stripping zone symmetric about the centerline within a 1/3‐slab thickness, and most have a considerably obvious long‐ and short‐axis tendency, which can be approximated as ellipsoids. The microporosity evolution in the wide‐thick slab during HR at the solidification end is numerically investigated with a 3D thermal–mechanical coupled model. The microporosity evolution in an aggregated distribution region during HR is little influenced by the surrounding microporosities. With increasing slab centerline‐microporosity distance, the microporosity minimization effect of HR becomes poor. When the axial ratio (long axis/short axis) is 1.43, the microporosity closure is the largest, and the porosity closure is the highest when the long axis is perpendicular to the reduction direction. When the total segment reduction is constant, the reduction mode with gradually decreasing reduction results in the highest total porosity closure and minimum reduction force.

show abstract

Characterization of Single and Multiphase Hydrodynamics in Continuous Slab Casting Mold in the Presence of Applied Magnetic Field

Cited by 4 publications

References 19 publications

Numerical Simulation for Two‐Phase Flow, Heat Transfer, and Inclusion Transport in Bloom Mold Considering the Effects of Argon Gas Injection and Mold Electromagnetic Stirring

Numerical Simulation for Two‐Phase Flow, Heat Transfer, and Inclusion Transport in Bloom Mold Considering the Effects of Argon Gas Injection and Mold Electromagnetic Stirring

Magnetohydrodynamic stabilizer suppressing gas entrainment for safety improvement in a sodium‐cooled fast reactor

Evolution of Microporosities in Wide‐Thick Continuous Casting Slab during Heavy Reduction Process

Contact Info

Product

Resources

About