Multiphase Vortex Flow Patterns in Slab Caster Mold: Experimental Study

Srinivas, Peri Subrahmanya; Singh, Anugrah; Korath, Jose Martin; Jana, Amiya K.

doi:10.2355/isijinternational.isijint-2017-062

Cited by 21 publications

(8 citation statements)

References 24 publications

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“…Based on this equation, the critical velocity difference for the actual model should be 0.326 m/s. According to Froude similarity principle, 20) the critical velocity difference for our experiment should be 0.15 m/s. However, for our physical model, the two interference fluids are water (1 000 kg/m 3 ) and mercury (13 600 kg/m 3 ), respectively.…”

Section: Effect Of Sen Clogging Rate On the Flow In Thementioning

confidence: 99%

“…They claimed that the free surface velocity should be larger than 0.1 m/s. Based on Froude similarity principle, 20) the minimum free surface velocity for our physical experiment should be 0.045 m/s. Therefore, the reasonable free surface velocity should be ranged from 0.045 to 0.15 m/s for our experiment.…”

Section: Effect Of Sen Clogging Rate On the Flow In Thementioning

confidence: 99%

“…[14][15][16][17][18] Both the flow field and the velocity of the free surface have a significant influence on the slab quality. [19][20][21] But, only few are performed to study the influence of the rate of the SEN clogging on the flow field in the mold. Srinivas et al 22) studied the influence of the clogging degree on the flow field through a water model.…”

Section: Introductionmentioning

confidence: 99%

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Physical Modeling of Asymmetrical Flow in Slab Continuous Casting Mold due to Submerged Entry Nozzle Clogging with the Effect of Electromagnetic Stirring

Shen

et al. 2019

ISIJ Int.

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Submerged Entry Nozzle (SEN) clogging is a serious problem for continuous casting process and slab quality. In order to investigate the impact of the SEN clogging rate on the flow field and the optimization effect of electromagnetic stirring (EMS) on the asymmetrical flow due to the SEN clogging, a 1:5 scaled mercury model, with various SEN clogging rates and different electromagnetic stirring currents was established and the flow velocity was measured by means of Ultrasonic Doppler Velocimetry (UDV). S index is introduced to judge quantitatively whether the horizontal flow pattern is symmetrical or not. The results show that the symmetry of the flow pattern in the mold becomes broken with the increase of the SEN clogging rate. In this study, EMS is an effective method to increase S index and active the free surface flow when the SEN clogging rate is under 50%. However, the stirring current of EMS should be controlled to avoid the adverse surface flow which may induce slag entrapment.

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Section: Effect Of Sen Clogging Rate On the Flow In Thementioning

confidence: 99%

Section: Effect Of Sen Clogging Rate On the Flow In Thementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Physical Modeling of Asymmetrical Flow in Slab Continuous Casting Mold due to Submerged Entry Nozzle Clogging with the Effect of Electromagnetic Stirring

Shen

et al. 2019

ISIJ Int.

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“…1,2) The flow pattern of the steel/slag interface controls slag entrapment, bubble motion, and inclusion removal behavior in the mold. 3) Many previous studies regarding the effects of SEN [4][5][6][7] and argon gas injection [8][9][10][11] on the turbulent flow and level fluctuations in the CC mold have been reported. Morales et al 5,7) physically investigated the effect of the nozzle port shape on the turbulent flow in a slab mold by applying particle image velocimetry and concluded that flows using a special bottom design with a square-port nozzle yield less significant effects with regard to the secondary phase.…”

Section: Introductionmentioning

confidence: 99%

“…8) Liu et al 9) numerically analyzed the effect of argon bubbles on the melt flow in a CC mold and found that large bubbles attack the meniscus and induce upward-directed steel flows in the free surface near the SEN, while small bubbles are trapped by the solidification front. Srinivas et al 10) investigated the multiphase vortex flow in the CC slab mold under different SEN and air flow rates by water-model experiments and concluded that the increase in the air flow rates decreases not only the number of vortices but also their depths. The investigations described above focused on the inclination angle (IA), immersion depth, and port shape of SEN, with no consideration of the divergent angle (DA) of SEN being widely applied in the previous studies of the pouring process of rectangular billet to reduce the impact effect of jetting flow on the mold and to control the slag entrapment.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Flow in a Slab Mold with Argon Blowing by Divergent Bifurcated SEN

et al. 2019

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The melt flow and bubble motion in a 230 × 1 300 mm 2 continuous casting slab mold were investigated under different inclination angle, divergent angles and immersion depth of the submerged entry nozzle (SEN) and different argon gas injection rates using a volume of fluid (VOF) and discrete phase model (DPM) to avoid slag entrapment and enhance the removal rate of nonmetallic inclusions. Water-model experiments were conducted to validate the numerical models. Moreover, the optimized conditions were applied in a manufacturing plant. The results showed that the simulated steel/slag level fluctuation and argon bubble trajectories are consistent with the experimental results. The optimized SEN structure has an inclination angle of 20° and a divergent angle of 9°, which can improve the flow pattern in the steel/ slag interface, alleviate the level fluctuations, decrease the chance of slag entrapment, and optimize the movement of inclusions. The immersion depth of SEN should be 150 mm, which is beneficial to the floating removal of non-metallic inclusions and reduce the level fluctuation at steel/slag interface. The optimal argon gas blowing rate to avoid slag entrapment near the SEN is 10 L/min. Furthermore, the rate of edge defects (ED) in the hot roll strip induced by slag entrapment is apparently reduced by applying the above conditions.

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Effect of Flow Field on Surface Slag Entrainment and Inclusion Adsorption in a Continuous Casting Mold

Zhang

Liu

Cui

2019

steel research int.

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A water model of slab mold was established to analyze the flow field behaviors. Particle image velocimetry measurement, fluctuation sensors, and industrial experiments were adopted to analyze the slag entrainment and inclusion adsorption. The risk of surface slag entrainment was discussed from the perspectives of flow patterns, surface fluctuation, and velocity. The ability of mold slag to adsorb inclusions was discussed by electrolysis on slab samples. The results reflected that the flow field determined the fluctuated amplitude, surface pattern and flow velocity of the mold surface, playing an important role in the slag entrainment and inclusion adsorption. Uneven surface fluctuations and downward vertical velocity lead to high slag entrapping risk. High surface horizontal velocity in mold leads to a higher inclusion concentration gradient at the slagsteel interface, which leads to a stronger ability of mold slag to adsorb inclusions.

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Multiphase Vortex Flow Patterns in Slab Caster Mold: Experimental Study

Cited by 21 publications

References 24 publications

Physical Modeling of Asymmetrical Flow in Slab Continuous Casting Mold due to Submerged Entry Nozzle Clogging with the Effect of Electromagnetic Stirring

Physical Modeling of Asymmetrical Flow in Slab Continuous Casting Mold due to Submerged Entry Nozzle Clogging with the Effect of Electromagnetic Stirring

Optimization of the Flow in a Slab Mold with Argon Blowing by Divergent Bifurcated SEN

Effect of Flow Field on Surface Slag Entrainment and Inclusion Adsorption in a Continuous Casting Mold

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