Mechanism of fluid flow in a continuous casting tundish with different turbo‐stoppers

Odenthal, Hans-Jürgen; Bölling, Ralf; Pfeifer, Herbert; Holzhauser, Jörg-Friedrich; Wahlers, Franz-Josef

doi:10.1002/srin.200100153

Cited by 31 publications

(15 citation statements)

References 7 publications

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“…The tundish impact pad, such as shown in Fig. 23, 59,135) is an inexpensive flow control device that prevents erosion of the tundish bottom where the molten steel stream from the ladle impinges. More importantly, it suppresses turbulence inside the inlet zone, which lessens slag entrainment.…”

Section: Tundish Flow Controlmentioning

confidence: 99%

State of the Art in Evaluation and Control of Steel Cleanliness.

2003

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This paper first reviews the current "state-of-the-art" in the evaluation of steel cleanliness, discussing over 20 different methods. The demand for cleaner steels requires lowering non-metallic oxide inclusions and also controlling their morphology, composition and size distribution. Because no single method can measure all of these aspects accurately, it is best to combine several methods together to quantify steel cleanliness in a given operation. Owing to the cost, time requirements, and sampling difficulties, steel cleanliness is widely inferred using total oxygen, nitrogen pick-up, and other indirect methods. Recent cleanliness values using these indicators are summarized for LCAK at many steel plants around the world. Secondly, this paper reviews operating practices to improve steel cleanliness at the ladle, tundish and continuous caster, emphasizing findings quantified with plant measurements. Inclusions come from many sources, including deoxidation, reoxidation, slag entrapment, refractory wear, and chemical reactions. They generate many defects such as cracks and slivers in the steel product. Steel cleanliness is controlled by attention to a wide range of important operating conditions throughout the steelmaking and casting processes. For ladle operations, FeO and MnO in the slag, ladle treatments, and inclusion modification are discussed. For tundish operations, tundish depth and capacity, casting transitions, refractory lining, tundish flux; gas stirring, and flow controls are discussed. Important transfer operations from ladle to tundish and from tundish to mold, such as argon protection, sealing issues, and SEN clogging are summarized. Caster operations reviewed include the effect of casting speed, fluid flow pattern control, surface level control, and caster curvature.

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Section: Tundish Flow Controlmentioning

confidence: 99%

State of the Art in Evaluation and Control of Steel Cleanliness.

2003

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“…• Momentum conservation equations For 2D axisymmetric geometries, the axial and radial momentum conservation equations are as described below in equations (2) and (3):…”

Section: "Vacuum Shroud"-a Novel Technological Conceptmentioning

confidence: 99%

“…Turbostop or impact pad initially developed to combat this slag eye generation and reduce turbulence in tundish melt. The details flow patterns by using turbo stop have been investigated early by some researchers [2]. But it is little bit effective to control these phenomena.…”

Section: Introductionmentioning

confidence: 99%

“Vacuum Shroud (VS)”-A Green Flow Control Device (FCD) towards Replacement of “Turbo Stop” In Tundish Metallurgy

Chatterjee¹

2017

AJMM

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In 21st century due to global market steelmakers are facing tough competition to sell product and for that reason stringent quality steel is required to manufacture. As tundish is an important buffer before the steel cast to semifinished product so it is the aim of the metallurgist over the last three decades to enhance the performance of this reactor. In this regard slag eye formation, slag metal emulsifications, turbulence during metal transfer operation at the time of ladle changing period and inclusions generations from re-oxidation have adverse effects towards production of high purity liquid steel. To combat these phenomena researchers have tried to develop different shrouds and impact pads to control the turbulence within the steel melt during steady and unsteady state operations. But no technology is able to reach to the ultimate success. In the current context a new concept has been developed called "Vacuum Shroud (VS)" which studied numerically by using ANSYS FLUENT software to explore the effect of currently innovative flow control device in comparison with others previously developed technology towards improvement of the tundish performance. It is found that the novel device is highly capable to replace turbostop and will reduce the mentioned problems forever.

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“…14) Q. Hou et al 15) have compared the standard and Renormalization group (RNG) 16) k-ε turbulence models in a case of swirling flow tundish. H. Odenthal et al [17][18][19] have used Realizable k-ε model 20) which is an advance model of standard k-ε model. They found good approximation by using RANS equation combined with the realizable k-ε model.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Turbulence Models for Prediction of Intermixed Amount with Free Surface Variation Using Coupled Level-Set Volume of Fluid Method

Siddiqui

Jha

2014

ISIJ Int.

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In continuous casting tundish steelmaking, old ladle is replaced by new one to ensure continuous supply of steel from tundish to mold. Bath height changes in case of ladle change-over. To bring the bath height level to normal height, the flow rate of liquid steel from the new ladle is increased. This has a direct bearing on the fluid flow pattern and resultant intermixed amount formed. In the present work, assessment of Reynoldsaveraged Navier-stokes (RANS) equations based standard k-ε, Renormalization group (RNG) k-ε, Realizable k-ε standard k-ω, and Shear-stress transport (SST) k-ω turbulence models have been carried out for prediction of free surface level of steel in tundish during ladle change-over and the intermixed amount formed. Coupled Level-Set Volume of Fluid (CLSVOF) method was used for free surface tracking in the three dimensional, multi-phase numerical model. Physical investigations were carried on water model setup of reduced scale tundish. Inflow rate of steel into the tundish from second ladle was varied due to which free-surface height of water varied and grade mixing in tundish was analyzed. Results obtained through physical investigations were compared with that of numerical investigations. The predictions revealed that RNG k-ε model have good approximation of F-curves as well as the interface between the two phases. Predictions made by all models except SST k-ω model have shown a satisfactory approximation with the experimental values. Free-surface interface profiles predicted by variants of k-ε models were seen to closely match with experimental data.

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Mechanism of fluid flow in a continuous casting tundish with different turbo‐stoppers

Cited by 31 publications

References 7 publications

State of the Art in Evaluation and Control of Steel Cleanliness.

State of the Art in Evaluation and Control of Steel Cleanliness.

“Vacuum Shroud (VS)”-A Green Flow Control Device (FCD) towards Replacement of “Turbo Stop” In Tundish Metallurgy

Assessment of Turbulence Models for Prediction of Intermixed Amount with Free Surface Variation Using Coupled Level-Set Volume of Fluid Method

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