Modelling of Pressure Distribution inside the SEN in a Stopper‐rod controlled System

Savolainen, Jari; Rousu, Arto; Fabritius, Timo; Mattila, Olli; Sulasalmi, Petri

doi:10.1002/srin.201000012

Cited by 9 publications

(10 citation statements)

References 12 publications

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“…From previous work, it has been noted that fluid flow behavior in the mold region depends on the SEN different parameters such as mold thickness, port thickness, port angle etc. 7,[9][10][11][12] In the present work, numerical investigation has been carried out to find out the effect of SEN port angle on the fluid flow behavior. Figure 1 shows the schematic diagram and dimensions of the computational domain.…”

Section: Introductionmentioning

confidence: 99%

Effect of Port Angle of Sen on Melt Flow in a Mold

Siddiqui¹

2018

IRATJ

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The molten metal from tundish is directed to continuous casting mold by submerged entry nozzle (SEN). The SEN is usually bifurcated nozzle, which is made of different shape and angle. The melt flow structure in mold plays an important role. Thus, port of SEN is made at different angles to control the melt structure. Many authors have reported that longitudinal high magnitude of melt and subsequent production of turbulence causes severe defects in casted products. In the present work, the melt flow structure has been studied under different port angles. It has been seen that melt flow has been modified in the continuous casting mold. Moreover, it was found that the change in SEN port angle affects vertical downward velocity and turbulence behavior in the molten steel region.

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Section: Introductionmentioning

confidence: 99%

Effect of Port Angle of Sen on Melt Flow in a Mold

Siddiqui¹

2018

IRATJ

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“…equalizing Equations (17) and (18) plus Equation 16, it is gotten the following expression for the friction velocity (19) finally, according to the log law in the sub-laminar boundary layer (Equation 13) it is gotten,…”

Section: Theoretical Thickness Of the Sub-laminar Boundary Layermentioning

confidence: 99%

“…Metals 2020, 10, x FOR PEER REVIEW 7 of 20 * = 1 2 C (19) finally, according to the log law in the sub-laminar boundary layer (Equation 13) it is gotten,…”

Section: Touching Inclusions Percentagesmentioning

confidence: 99%

“…Researchers who have worked on the determination of inclusions sources and clogging recognize that the deposited inclusions at the nozzle wall are mainly alumina inclusions [7][8][9]15,16]. Steel re-oxidation occurs due to possible air aspiration under the flow control valves (slide gate or stopper rod) to maintain the entry flow to the molds [17][18][19]. Besides, regardless of the refractory nozzle composition (alumina graphite, zirconia magnesia, or Al2O3-carbon), steel melt infiltrates the refractory and removes the protective surface [11,20], allowing the entrapment of refractory particles and inclusion attachment at the nozzle wall.…”

Section: Introductionmentioning

confidence: 99%

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Decrease of Nozzle Clogging through Fluid Flow Control

Gutiérrez

Barreto

Garcia-Hernandez

et al. 2020

Metals

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Decreasing the clogging deposition rate of alumina inclusions in continuous casting nozzles is possible through three simultaneous measures: Flow modification, use of raw materials with low impurities contents, and smoothed internal surfaces. The control of the internal flow consists on avoiding dead regions and developing symmetric patterns. A mathematical model performed tests of the feasibility of these measures. The adherence of inclusions to the nozzle wall, using this model, employs a boundary condition based on the thickness of the sublaminar boundary instead of the conventional “trap” boundary condition. The use of the general boundary condition yields deposition rates that are unaffected by the inclusion size. The proposed boundary condition discriminates against the clogging deposition rate through the particle sizes. Plant trials complemented with water modeling, using these nozzles, proved that the present approach could considerably decrease the clogging occurrence.

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“…Air aspiration during continuous casting is very detrimental, because it generates nonmetallic inclusions through reoxidation [1][2][3]. Air aspiration is caused by negative pressure (i.e., lower than atmospheric pressure) developing near the narrow opening regulated by the flow control system (slide-gate or stopper rod system) [2,4]. A huge pressure drop occurs across the narrow opening through two mechanisms: flow acceleration and pressure loss.…”

Section: Introductionmentioning

confidence: 99%

Modeling Air Aspiration in Steel Continuous Casting Slide-Gate Nozzles

Yang

Olia

Thomas

2021

Metals

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Air aspiration is an important cause of nozzle clogging and inclusions in final products of continuous casting of steel due to the presence of metal oxides (such as alumina) which occur through the reoxidation of molten steel. This problem is most likely to occur when the flow control system (slide-gate or stopper rod) causes the pressure inside the nozzle to drop below atmospheric pressure, drawing gas into the system through possible cracks or gaps in the refractory walls. In this work, a 1-D pressure-energy model of the complete metal delivery system from the tundish to the mold is developed to predict the pressure distribution and throughput under dynamic operating conditions and varying clogging conditions. The energy balance approach includes pressure losses in the slide-gate, wall friction, and nozzle geometry variations, including the effects of multiphase flow due to argon gas injection. The model also predicts air aspiration, oxide inclusion formation, and the time for clogging shutdown. The predicted pressure distribution is verified with a three-dimensional numerical simulation of multiphase turbulent flow, and is validated with plant measurements. Parametric studies with different submerged entry nozzle (SEN) designs revealed that a smaller SEN diameter may lessen negative pressure by redistributing the pressure loss from the slide-gate to the entire nozzle through increased friction losses. Under negative pressure, a submillimeter-thin gap was shown to cause considerable air aspiration. Clogging shutdown times were evaluated for several scenarios under static and dynamic operating conditions.

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Modelling of Pressure Distribution inside the SEN in a Stopper‐rod controlled System

Cited by 9 publications

References 12 publications

Effect of Port Angle of Sen on Melt Flow in a Mold

Effect of Port Angle of Sen on Melt Flow in a Mold

Decrease of Nozzle Clogging through Fluid Flow Control

Modeling Air Aspiration in Steel Continuous Casting Slide-Gate Nozzles

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