Mathematical Modeling of Iron and Steel Making Processes. Mathematical Model for Transient Fluid Flow in a Continuous Casting Mold.

Takatani, Kouji; Tanizawa, Y.; Mizukami, Hideo; K, Nishimura

doi:10.2355/isijinternational.41.1252

Cited by 54 publications

(46 citation statements)

References 15 publications

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“…However, almost similar gas flow distribution, i.e. steep increase in the vicinity of nozzle, as in the previous work, 14) is obtained in all conditions despite of various fluid material, gas flow rate, mold size and throughput. In the water model and fusible alloy model, gas is injected into closed loop, all of the gas must be brought into submerged entry nozzle, while part of argon might elude into tundish at molten steel system.…”

Section: Measurement Of Argon Flow Rate Through Moldsupporting

confidence: 60%

“…For the sake of comparison among various conditions, gas flow rate is indicated as volume ratio by unit meniscus area against injected volume. And measured data with 1/4 feasible alloy model 14) is also shown after conversion under same criterion.…”

Section: Measurement Of Argon Flow Rate Through Moldmentioning

confidence: 99%

“…Net argon flow rate at commercial slab caster is one-fourth or fifth compared with water model or feasible alloy model. A smaller gas bubble reaches long distance, 14) and buoyancy force must be significantly different among three fluid materials due to density gap. These results indicate that injected gas distribution, however, is much alike in the mold width direction regardless of fluid material.…”

Section: Measurement Of Argon Flow Rate Through Moldmentioning

confidence: 99%

See 2 more Smart Citations

Fluid Flow Behavior in Submerged Entry Nozzle of Continuous Casting

Kato¹,

Hara²,

Muto

et al. 2007

ISIJ Int.

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Section: Measurement Of Argon Flow Rate Through Moldsupporting

confidence: 60%

Section: Measurement Of Argon Flow Rate Through Moldmentioning

confidence: 99%

Section: Measurement Of Argon Flow Rate Through Moldmentioning

confidence: 99%

See 1 more Smart Citation

Fluid Flow Behavior in Submerged Entry Nozzle of Continuous Casting

Kato¹,

Hara²,

Muto

et al. 2007

ISIJ Int.

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“…It usually enters the continuous casting mold after injection into the submerged entry nozzle (SEN), and a lot of large bubbles will be safely escape from the top surface, but some smaller bubbles (surrounded by inclusions) either be harmfully entrapped in the shell, at the solid/liquid interface of the solidifying metal, [1][2][3][4] causing pinhole defects, as shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Transient Two-Phase Flow in a Continuous Casting Mold Using Euler-Euler Large Eddy Simulation Scheme

Liu

Jiang

et al. 2013

ISIJ Int.

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Euler-Euler Large Eddy Simulation (EELES) scheme has been developed to simulate the two-phase flow of argon gas and molten steel in slab continuous casting mold. The Euler-Euler approach is used to describe the equations of motion of the two-phase flow. The drag force, lift force and virtual mass force are incorporated in this model. Both turbulence of argon gas and molten steel are simulated using large eddy simulation (LES). Simulation results agree acceptably well with the water model experimental measurements of instantaneous flow structures. The flow pattern in the lower recirculation zone is expected to be asymmetrical between the left and right sides of the mold. The flow pattern is changeover; the direction of flow deviation is different from time to time. The time intervals for changeover appeared to vary randomly. The long-term asymmetry in the lower roll is due to the turbulent nature instead of the variation of other operating parameters. The turbulent flow in the mold includes multiple vortices. Those vortexes make the flow field to be more complex. Two typical transient flow structures, consisting of clockwise or counterclockwise rotational direction vortices, are found in the upper roll.

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“…Some slab casting submerged nozzle designs induce strong meniscus instability and high amplitude oscillations of liquid steel in the mold. 6) Takatani et al 7) found that in a conventional slab mold the horizontal velocity under the meniscus fluctuates strongly. Using a physical model Yoshida et al 8) identified downward flows at the meniscus along the outer surface of the SEN due to the existence of differential pressure in this region.…”

Section: Introductionmentioning

confidence: 99%

Design of a Submerged Entry Nozzle for Thin Slab Molds Operating at High Casting Speeds

et al. 2012

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A submerged entry nozzle (SEN) for thin slab casters operating at casting speeds as high as 7.5 m/minute was developed based on fundamental grounds of boundary-layer theory and water modeling experiments. Experimental techniques included tracer injection to observe overall fluid flow patterns, high speed video camera and image analysis to follow dynamic changes of meniscus levels and particle image velocimetry to measure water speeds in the mold. This design was compared with two other SEN designs of nozzles under current commercial use at various thin slab casters. Direct comparisons of mathematical simulations and experimental results among the three SEN's evidenced that this new SEN yields very stable flows which are independent from casting speed and nozzle immersion depth. Fluid flow developed by this SEN consists of a double roll pattern without generation of superficial vortices. The two other SEN's yield instable discharging jets due to and excessive shearing effects with the surrounding fluid inducing severe dissipation of kinetic energy which promotes severe tailing effects inducing strong meniscus oscillations. The proposed design has reported good industrial performances and a longer operating life because the slag protection belt suffers less wear thanks to smaller velocities of the bath in contact with the SEN wall.

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Mathematical Modeling of Iron and Steel Making Processes. Mathematical Model for Transient Fluid Flow in a Continuous Casting Mold.

Cited by 54 publications

References 15 publications

Fluid Flow Behavior in Submerged Entry Nozzle of Continuous Casting

Fluid Flow Behavior in Submerged Entry Nozzle of Continuous Casting

Modeling of Transient Two-Phase Flow in a Continuous Casting Mold Using Euler-Euler Large Eddy Simulation Scheme

Design of a Submerged Entry Nozzle for Thin Slab Molds Operating at High Casting Speeds

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