Flow Control of Molten Steel in Mold with Superconducting Magnets

Mochida, Tetsuo; Kishimoto, Yasuo; Yamada, Toshio; Iijima, Hiroaki; Nara, Seiko; Takeuchi, Shuji

doi:10.2355/tetsutohagane1955.88.7_393

Cited by 5 publications

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Various control devices of molten steel flow have been investigated and developed. [6][7][8][9][10][11][12] Deep interest has been paid particularly for the meniscus behavior, which seems to influence the surface quality of products. However, flow control characteristics are very complicated, and it is difficult to understand flow control characteristics only by simple experiment and/or analysis, then these are not sufficiently understood at present.…”

Section: Introductionmentioning

confidence: 99%

Effects of Electromagnetic Brake and Meniscus Electromagnetic Stirrer on Transient Molten Steel Flow at Meniscus in a Continuous Casting Mold

Takatani¹

2003

ISIJ International

View full text Add to dashboard Cite

On the molten steel flow in the mold of the slab-type continuous caster, the analysis by the unsteady and three-dimensional mathematical model is carried out from the viewpoint of the meniscus behavior. As flow control methods at meniscus in the mold, electromagnetic brake and meniscus electromagnetic stirrer are chosen, and those flow control characteristics are investigated and results are as follows.1) The electromagnetic brake makes the molten steel flow two-dimensional, and the turbulence of fluid flow is suppressed, and the electromagnetic brake has suppression of the fluctuation of the fluid flow just under the meniscus and remarkable effect of temperature rising at meniscus.2) Flow control is possible with the interference of the electromagnetic force by the meniscus electromagnetic stirrer with the molten steel flow through the immersion nozzle, and meniscus electromagnetic stirrer emphasizes the fluctuation of molten steel flow in front of solidified shell and has slight temperature rising effect at meniscus.3) Selection of discharge angle of immersion nozzle is important for these flow control devices by the electromagnetic field. These flow control devices have no effect or have the opposite effect in some cases by the wrong selection of discharge angle.

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of Electromagnetic Brake and Meniscus Electromagnetic Stirrer on Transient Molten Steel Flow at Meniscus in a Continuous Casting Mold

Takatani¹

2003

ISIJ International

View full text Add to dashboard Cite

show abstract

“…Therefore, there are a lot of studies that deal with the molten steel flow in a mold under a magnetic field. [13][14][15][16][17][18][19][20] It is reported that argon gas is able to change the molten steel flow pattern in a mold due to the difference of the specific gravity [21][22][23][24][25][26][27] and causes a fluctuation at the free surface. Because of that, some studies treating the electromagnetic force take argon gas into consideration.…”

Section: Numerical Simulation Of Molten Steel Flow Under a Magnetic Fmentioning

confidence: 99%

Numerical Simulation of Molten Steel Flow under a Magnetic Field with Argon Gas Bubbling in a Continuous Casting Mold

Kubo

Ishii

Kubota³

et al. 2004

ISIJ International

View full text Add to dashboard Cite

“…They also reported the empirical equation that decreasing rate is proportional to 4th order of magnetic induction. Mochida et al 6) reported the usage of super conducting magnets for flow control of molten steel and reported an extensive decrease of inclusion of alumina particles even at high speed casting of 3 m/min. Mochida et al 7) also reported the usage of superconducting magnet that the depth of oscillation hook decreased due to the calming of melt surface.…”

Section: Introductionmentioning

confidence: 99%

“…Mochida et al 6) reported the usage of super conducting magnets for flow control of molten steel and reported an extensive decrease of inclusion of alumina particles even at high speed casting of 3 m/min. Mochida et al 7) also reported the usage of superconducting magnet that the depth of oscillation hook decreased due to the calming of melt surface. Suzuki et al 8) reported the decrease in the number of pin-holes and the clusters due to the magnetic stirring effect.…”

Section: Introductionmentioning

confidence: 99%

Numerical Computation for the Melt Convection of the Model System of Continuous Steel Casting with Various Magnetic Fields

Kaneda

Tagawa

et al. 2003

ISIJ International

View full text Add to dashboard Cite

Melt flow in the model system of continuous steel casting process was numerically computed with an application of various magnetic fields. The model geometry is 1ϫ1ϫ2 which is not in accordance with the current shape employed in a practical industry. Electric coil to produce a magnetic field was either vertical, horizontal and parallel, or perpendicular to the nozzle jet from the tandish. Detailed melt flow in the mold is graphically presented. The axial magnetic field appears to suppress the jet flow most effectively.KEY WORDS: continuous steel casting; magnetic field; numerical calculation.In the X-or Y-directional magnetic fields, two electric coils were located at the outside of the vertical walls with the electric current in the same direction. The dimensional equivalent size is as follows. The width of the rectangular mold is lϭ0.064 m and the diameter of an electric coil is 0.1 m. The molten steel is presumed to come down from the tandish through a rectangular pipe of 0.1lϫ0.1l and flows out in the oblique direction into the mold. The molten steel is at higher temperature. Four surrounding boundaries of mold is kept at cold temperature with top and bottom boundaries presumed to be thermally adiabatic. From the bottom boundaries, the molten steel was assumed to flow out with uniform equivalent volume flow rate as that from the top inlet.The three-dimensional model equations consist of the equation of continuity, momentum equations, energy equation, Ohm's law, continuity equation of electric current. The magnetic induction was computed from Biot-Savart law as follows. The dimensionless equations are as follows. The initial and boundary conditions for computation are as follows.At the top inlet, Wϭ1, Tϭ0.5, At the top surface, U ᠬ ϭ0, ∂T/∂Zϭ0, J ᠬ ϭ0 At the bottom boundary, Wϭ1/100, ∂T/∂Zϭ0, ∂J z /∂Zϭ0The dimensionless variables are defined in the nomenclature. The characteristic dimensionless values are defined as follows.w in is a velocity through the top nozzle and l in ϭl/10. Re in represents the inlet condition correctly. Actual Reynolds number at the bottom exit should be 1/100 of Re above.The above dimensionless equations were approximated with finite difference equations. The pressure was computed by the HSMAC method. The inertial terms were approximated with the third-order upwind scheme. The dimensionless time increment is 2ϫ10 Ϫ4 . The rectangular enclosure was divided into 50 3 grids with non-uniform staggered mesh. The detailed view of the nozzle is shown in Fig. 2. The inside of the nozzle was assumed to be stair-steps for the sake of simplicity with 0.01 dimensionless length. Computed ResultsThe computational conditions are as follows. Reϭ10 directional velocity component U max in the X-directional magnetic field at Haϭ0, 100, 200 and 500. At t=5, magnetic field was impressed. The convergence is smooth to suggest the stable numerical computation. (f) suggests the Z-directional magnetic field appears to provide very large magnetic suppression in comparison to those in the X-or Y-directional on...

show abstract

Flow Control of Molten Steel in Mold with Superconducting Magnets

Cited by 5 publications

References 4 publications

Effects of Electromagnetic Brake and Meniscus Electromagnetic Stirrer on Transient Molten Steel Flow at Meniscus in a Continuous Casting Mold

Effects of Electromagnetic Brake and Meniscus Electromagnetic Stirrer on Transient Molten Steel Flow at Meniscus in a Continuous Casting Mold

Numerical Simulation of Molten Steel Flow under a Magnetic Field with Argon Gas Bubbling in a Continuous Casting Mold

Numerical Computation for the Melt Convection of the Model System of Continuous Steel Casting with Various Magnetic Fields

Contact Info

Product

Resources

About