Mathematical modelling of flows and discrete phase behaviour in a V-shaped tundish

Schwarze, Rüdiger; Obermeier, F.; Hantusch, Jan; Franke, Armin; Janke, Dieter

doi:10.1002/srin.200100108

Cited by 11 publications

(13 citation statements)

References 9 publications

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“…For the inclusion motion in tundish, studies have been carried out to investigate the inclusion removal under the effects of various factors such as flow control devices, tundish geometries, gas bubbling rates, and inclusion sizes. [1][2][3][4][5][6][7][8] After inclusions move from the tundish into the SEN, their deposition on the SEN wall can lead to nozzle clogging. In order to understand the deposition location and mechanism, computational fluid dynamics (CFD) studies have been carried out to investigate the inclusion transport in turbulent steel flows and its deposition on the SEN walls.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Nonmetallic Inclusion Motions in a Swirling Flow Submerged Entry Nozzle in a New Cylindrical Tundish Design

Ersson

Jonsson

et al. 2017

Metall Mater Trans B

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PEIYUAN NI, MIKAEL ERSSON, LAGE TORD INGEMAR JONSSON, and PÄ R GÖ RAN JÖ NSSONDifferent sizes and shapes of nonmetallic inclusions in a swirling flow submerged entry nozzle (SEN) placed in a new tundish design were investigated by using a Lagrangian particle tracking scheme. The results show that inclusions in the current cylindrical tundish have difficulties remaining in the top tundish region, since a strong rotational steel flow exists in this region. This high rotational flow of 0.7 m/s provides the required momentum for the formation of a strong swirling flow inside the SEN. The results show that inclusions larger than 40 lm were found to deposit to a smaller extent on the SEN wall compared to smaller inclusions. The reason is that these large inclusions have Separation number values larger than 1. Thus, the swirling flow causes these large size inclusions to move toward the SEN center. For the nonspherical inclusions, large size inclusions were found to be deposited on the SEN wall to a larger extent, compared to spherical inclusions. More specifically, the difference of the deposited inclusion number is around 27 pct. Overall, it was found that the swirling flow contains three regions, namely, the isotropic core region, the anisotropic turbulence region and the near-wall region. Therefore, anisotropic turbulent fluctuations should be taken into account when the inclusion motion was tracked in this complex flow. In addition, many inclusions were found to deposit at the SEN inlet region. The plotted velocity distribution shows that the inlet flow is very chaotic. A high turbulent kinetic energy value of around 0.08 m 2 /s 2 exists in this region, and a recirculating flow was also found here. These flow characteristics are harmful since they increase the inclusion transport toward the wall. Therefore, a new design of the SEN inlet should be developed in the future, with the aim to modify the inlet flow so that the inclusion deposition is reduced.

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Section: Introductionmentioning

confidence: 99%

A Study on the Nonmetallic Inclusion Motions in a Swirling Flow Submerged Entry Nozzle in a New Cylindrical Tundish Design

Ersson

Jonsson

et al. 2017

Metall Mater Trans B

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“…The main currents of the presented studies concern physical [19,20] and numerical modeling of flow phenomena and refining processes. [4,6,16] Reports concerning the experimental tests carried out on commercial plants are available. [10,21,22] Studies that describe the efficiency of tundishes involved the use of macromixing characteristics called residence time distribution (RTD) relationships.…”

Section: Modern Continuous Steel Casting (Csc) Plantsmentioning

confidence: 99%

“…These studies involve numerous rectangular tundishes provided with two nozzles [1] being in use (from singleand multiple-strand through-type [2,3] or ''delta''-type units [4,5] to untypical ''V''-type, [6] ''H''-type, [7] and ''L''-type units [8,9] ). Among the research results reported in the literature, multistrand tundishes seldom occur.…”

Section: Modern Continuous Steel Casting (Csc) Plantsmentioning

confidence: 99%

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Optimization of a Six-Strand Continuous Casting Tundish: Industrial Measurements and Numerical Investigation of the Tundish Modifications

Merder

Warzecha

2012

Metall Mater Trans B

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The main differences in the transient zone extent between the individual strands for the former industrial six-strand tundish configuration is the basis for undertaking this study. The aim this study was to improve the casting conditions by proposing the optimal equipment of the tundish working space. For economic reasons, only the variants with different baffles configurations were considered. It was also dictated by the simplicity of construction and the possibility of its implementation by the base operating steel mill. In the current study, industrial plant measurements and mathematical modeling were used. Industrial experimental data were used to diagnose the current state of the industrial tundish and then validate the numerical simulations. After this, the influence of different baffle configurations installed in the tundish on the steel flow characteristic was modeled mathematically. Residence time distribution (RTD) curves are plotted, and individual flow shares for the investigated tundish were estimated based on the curves. Finally, the industrial plant was rebuilt according to the numerical results and additional plant measurements were performed. A result of the appearance of the baffles in the tundish working space was the reduction of the transient zone extent. The results indicate the increasing share of the dispersed plug flow and a decreasing share of the dead volume flow, with a practically unchanging share of well-mixed volume flow in the modified tundish.

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“…A smaller peak value contributes to better mixing parameters such as large value of mean residence time (MRT) and ratio of mixed to dead volume inside the tundish. Many researchers [21][22][23][24][25] have studied the effect of flow modifiers for fluid flow phenomena and RTD behaviour of multistrand tundish. The use of flow modifiers causes a decrease in the dead volume and results in a significant decrease in the range of transient zone and therefore in the quantity of steel being cast.…”

Section: Introductionmentioning

confidence: 99%

Effect of blockage of outlet nozzle on fluid flow and heat transfer in continuously cast multistrand billet caster tundish

Mishra

Jha

Sharma

et al. 2012

Canadian Metallurgical Quarterly

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Shop floor problems like strand breakout, mechanical or electrical failure in the strand or inadequate availability of molten steel from coming ladle sometimes lead to closing one/two strand in a continuous casting unit. Closing any of the outlets affects the flow distribution inside the tundish and so it is important to study which of the outlets should be closed to have proper results in terms of residence time distribution (RTD) and thermal behaviour of the tundish. The present study aims at finding the effect of closing one or two outlets on flow behaviour and heat transfer in a multistrand tundish. Navier-Stokes equation has been solved using standard K-e turbulence model with the help of educational version of computational fluid dynamics software PHOENICS to find the steady state velocity field inside the tundish. Furthermore, tracer dispersion study was carried out using pulse input technique of the tracer to find the RTD curve of the tundish. Mixing parameters, namely ratio of actual to theoretical mean residence time and ratio of mixed volume to dead volume have been found out for different cases when either all the outlets are open or one/two outlets are closed. It was found that closing the near outlet increases the mixing capability of the tundish the most as compared with far or middle outlet. A larger recirculation zone created in the half of the tundish results in better mixing when near outlet is closed. Numerical code was validated against the experimental observation by performing the tracer dispersion study inside a multistrand tundish and reasonably good match between the experimental and numerical results in terms of RTD curves is observed.Des problè mes d'atelier comme la percé e du cordon, la dé faillance mé canique ou é lectrique du cordon ou la disponibilité inadé quate de l'acier fondu de la poche d'arrivé e mè nent quelquefois à la fermeture d'un ou deux cordons d'une unité de coulé e en continu. La fermeture de n'importe laquelle des orifices de sortie affecte la distribution de l'é coulement dans le panier de coulé e. Il est donc important de dé terminer lequel des orifices de sortie devrait ê tre fermé pour avoir des ré sultats approprié s par rapport au RTD et au comportement thermique du panier de coulé e. La pré sente é tude vise à trouver l'effet de la fermeture d'un ou deux orifices de sortie sur le comportement de l'é coulement et sur le transfert de chaleur dans un panier de coulé e à plusieurs lignes. On a ré solu l'é quation de Navier-Stokes en utilisant le modè le normal de turbulence K-e, avec l'aide de la version é ducationnelle du logiciel de CFD PHOENICS, afin de trouver le champ de vitesse à ré gime constant à l'inté rieur du panier de coulé e. En plus, on a effectué une é tude de dispersion de traceur en utilisant une technique d'entré e de l'impulsion du traceur afin de trouver la courbe de Distribution du Temps de Sé jour (RTD) du panier de coulé e. On a trouvé le paramè tre de mé lange, soit le rapport du temps de sé jour moyen actuel à thé orique et le rapport de...

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Mathematical modelling of flows and discrete phase behaviour in a V-shaped tundish

Cited by 11 publications

References 9 publications

A Study on the Nonmetallic Inclusion Motions in a Swirling Flow Submerged Entry Nozzle in a New Cylindrical Tundish Design

A Study on the Nonmetallic Inclusion Motions in a Swirling Flow Submerged Entry Nozzle in a New Cylindrical Tundish Design

Optimization of a Six-Strand Continuous Casting Tundish: Industrial Measurements and Numerical Investigation of the Tundish Modifications

Effect of blockage of outlet nozzle on fluid flow and heat transfer in continuously cast multistrand billet caster tundish

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