Modeling Study of the Vortex and Short Circuit Flow Effect on Inclusion Removal in a Slab Tundish

Garcia-Hernandez, Saul; Barreto, José de Jesús; Ramos-Banderas, José Ángel; Solorio-Díaz, Gildardo

doi:10.1002/srin.200900152

Cited by 23 publications

(23 citation statements)

References 39 publications

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“…This explains why steel cleanliness is affected during tundish drainage also when attempting to prevent as long as possible slag entrapment from surface. Such a conclusion was also made in 9. Note that in the figures inclusions are at first sight not trapped for the vortex above the central strand, which starts later due to the smaller flow tangential velocity.…”

Section: Resultssupporting

confidence: 73%

“…Such height increases when increasing drainage flow rate and decreasing exit diameter. More recently, further studies were performed with numerical modeling validated by water tests 8, 9. Here, the vortex occurrence related to turbulence at surface was highlighted, together with the effect of inclusion dragging exerted by the vortices and the fact that the short‐circuit flow accompanied to vortices is mostly harmful for steel cleanliness.…”

Section: Introductionmentioning

confidence: 97%

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Steel Thermo‐Fluid‐Dynamics at Tundish Drainage and Quality Features

Battaglia

Santis

Volponi

et al. 2012

steel research int.

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In steelmaking and casting, transient operations are very critical for product quality and process regularity. This holds especially for the tundish. Typical drawbacks can occur at ladle change, where, for example, refilling high flow rates induce flow short‐circuits risky for dispersed oxides (“inclusions”) dragging towards the strands. At drainage, vortices formation can affect steel cleanliness via slag entrapment. Such topics were investigated for an industrial tundish with computational fluid dynamics validated tools. The focus was given on a multi‐strand layout more prone to unevenness features. As a matter of fact, the different steel path to reach different strands causes often too high temperature differences and different strand cleanliness levels. Strands closer to the tundish center, are generally hotter and less clean; the others, slightly colder but cleaner. Multiphase models, together with advanced meshing techniques and validated boundary conditions, were used to describe tundish refilling and drainage. Within the operating conditions of concern, a bath height of 300 mm was found as a best compromise between the need of avoiding slag entrapment through vortices and to have maximum yield. Once applied into operating practice, no rejection for cleanliness or customer claims were achieved. As refers to temperature loss from ladle to tundish, a drop at strands of about 2 and of 4°C from tundish inlet to strand, in agreement with plant data over about 700 heats and literature experiments under the same operating conditions, were found.

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Section: Resultssupporting

confidence: 73%

Section: Introductionmentioning

confidence: 97%

Steel Thermo‐Fluid‐Dynamics at Tundish Drainage and Quality Features

Battaglia

Santis

Volponi

et al. 2012

steel research int.

View full text Add to dashboard Cite

show abstract

“…When the design is properly optimized and positioned, flow control devices (FCD) has shown positive effects on tundish performance. However, for the removal of small inclusion particles, these devices have failed to demonstrate their efficiency; furthermore, an improper optimization may result in detrimental flow patterns inside the tundish . In large volume tundish, which allow sufficient residence time for inclusion flotation, these devices are not recommended because they are inconvenient to sustain a hot cycle tundish practice.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of Dissipation Phenomena in a New Ladle Shroud for Fluidynamic Control and Its Effect on Inclusions Removal in a Slab Tundish

Solorio-Díaz

Davila-Morales

Barreto-Sandoval

et al. 2013

steel research int.

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In the current research study, a mathematical model was developed to study the dissipation phenomena inside a new design of ladle shroud and its effects on flow patterns and inclusion removal rate. The New Ladle Shroud performance is evaluated in a conventional slab tundish, and the results are compared to different flow control arrangements. The velocity of the entry jet is decreased and the bulk flow is well controlled, the inclusion removal rate is improved, and compared to those arrangements where turbulence inhibitors are used.

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“…Nevertheless, the selected tundish has been already physical and mathematically modelled and validated in previous works. 37,38) Since the present work shows the corresponding flow patterns in the tundish, it can be considered that the numerical model is validated.…”

Section: Validation and Final Remarksmentioning

confidence: 99%

Mathematical Analysis of the Dynamic Effects on the Deposition of Alumina Inclusions inside the Upper Tundish Nozzle

2016

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Nozzle clogging is still a standing problem in the continuous casting of steel since the deposition of alumina inclusions inside the Upper Tundish Nozzle (UTN) affects the productivity and the product quality. The present fundamental work studies the effects of inertial, gravitational, buoyant, pressure gradient, and Saffman forces on the deposited inclusion trajectories at the typical adhesion zone inside the UTN, using analytical and numerical techniques. For this, a mathematical model was developed considering the Navier-Stokes equations, the standard k-ε model, and the Lagrangian discrete phase model for a coupled system including the tundish, the UTN, the slide gate, the SEN, and the mould. The results show that the highest inclusion deposition rate is just below a low static pressure zone. At the low static pressure zone the pressure gradient force becomes important, attracting the inclusions to the nozzle wall, and once the inclusions leave this zone, this force does not promote a significant inclusion radial movement. In addition, at the highest deposition zone, the effects of the gravitational and buoyant forces do not promote a significant inclusion radial movement since these are aligned with the direction of the flow stream lines. In contrast, the Saffman force shows an important effect on the deposited inclusions, slowing down the inclusions in the vertical axis and increasing their radial movement.

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Modeling Study of the Vortex and Short Circuit Flow Effect on Inclusion Removal in a Slab Tundish

Cited by 23 publications

References 39 publications

Steel Thermo‐Fluid‐Dynamics at Tundish Drainage and Quality Features

Steel Thermo‐Fluid‐Dynamics at Tundish Drainage and Quality Features

Numerical Modelling of Dissipation Phenomena in a New Ladle Shroud for Fluidynamic Control and Its Effect on Inclusions Removal in a Slab Tundish

Mathematical Analysis of the Dynamic Effects on the Deposition of Alumina Inclusions inside the Upper Tundish Nozzle

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