A Practical Model for Predicting Intermixed Zone During Grade Transition

Cho, Myung Jong; Kim, Sang Joon

doi:10.2355/isijinternational.50.1175

Cited by 13 publications

(22 citation statements)

References 9 publications

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“…Cho and Kim [16] proposed a novel mixing model for quantifying the composition distribution in solidified steel during a grade mixing. In subsequent work [17], it was reported that the model was capable of predicting the intermixed zone of various different cases, namely, bloom, slab, and thin slab casting operations. Alizadeh et al [18] developed a numerical model to calculate the grade mixing in the tundish.…”

Section: Introductionmentioning

confidence: 99%

Two-Phase Numerical Modeling of Grade Intermixing in a Steelmaking Tundish

Siddiqui

Kim

2019

Metals

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The sequential casting of slabs is a major trend in the steel industry where steel quality is the most important factor. The operating parameters have the most influence on mixing phenomenon apart from the design and shapes of the tundish and its furniture. Moreover, in industrial practice, the bath height in tundish varied with time when the ladle is changed. In the present work, the numerical simulation has been carried out to study the effect of residual volume and outflow (throughput) rate on the mixing phenomenon inside the tundish. A transient, three-dimensional two-phase model using the Volume of Fluid (VOF) method and Level Set interface tracking method has been used to investigate the intermixed grade steel formation. A comparison of the two interface tracking schemes, i.e., Geo-reconstruct and Modified HRIC (High-Resolution Interface Capturing Scheme) has also been presented. The results obtained through numerical simulation has been compared with experimental results. In a later section, the results showed that residual volume has a significant effect on the grade mixing. The mixing phenomenon in tundish is considerably influenced by the advance-pouring box (APB). Further, the outflow rate of tundish has little impact on the grade intermixing phenomenon.

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Section: Introductionmentioning

confidence: 99%

Two-Phase Numerical Modeling of Grade Intermixing in a Steelmaking Tundish

Siddiqui

Kim

2019

Metals

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“…These parameters affect the fluid flow configuration inside the tundish and hence, their effect on the formation of intermixed amount will be an interesting and useful observation for the steel industries. Most of the previous numerical investigations have assumed steady state operating bath level of molten metal in tundish during physical and numerical investigations . The effect of inflow rate, residual volume, and bath height on grade intermixing during ladle change‐over process has not been studied extensively.…”

Section: Introductionmentioning

confidence: 99%

Effect of Inflow Rate Variation on Intermixing in a Steelmaking Tundish during Ladle Change‐Over

Siddiqui

Jha

2015

steel research int.

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The intermixing of dissimilar grades of steel in tundish during the ladle change-over is a problem of growing interest. During sequential casting of different grades, it is important that the intermixing of the grades is kept to a minimum. Present work deals with computational and water model studies of the three-dimensional turbulent fluid flow in a multi-strand tundish during ladle change-over process. The physical investigation has been carried out by conducting experiment on a 1:4 scale model of tundish. The numerical simulations have been carried out with the help of educational version of ANSYS Fluent, using the Volume of Fluid (VOF) method and incorporating standard k-ɛ turbulence model. The numerical model has been validated with the results of physical investigation and is found to be in good agreement. Further, the numerical model is used to study the ladle change-over process considering effect of inflow rate on grade mixing and interface positions, i.e., different bath height positions in tundish with and without advance pouring box (APB). It has been observed that the use of APB is not helpful in reducing the intermixed time while increase in flow rate of new grade steel decreases the intermixed amount.

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“…Among those studies, the investigations of the tundish make a major part. In view of the wide range of tundish optimization opportunities, as well as industrially operated tundish types themselves, research activities focusing on the tundish are still topical and being carried out by research centers both at home and abroad [1][2][3][4][5]. Studies on tundishes are conducted based on either physical or mathematical modeling.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Liquid Steel Flow Structure in the One Strand Slab Tundish with Subflux Turbulence Controller and Dam

Cwudziński¹,

Jowsa²

2012

Archives of Metallurgy and Materials

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The paper present the results of computational calculation showing liquid steel flow in the tundish. The one-strand slab tundish is used to casting slabs. The internal work space of tundish was modified by two flow control devices (FCDs). The first device is subflux turbulence controller situated in the pouring tundish zone. The second FCD is a dam with two holes. The dam presently using in the industrial conditions was modified by changing a height. Adapted to internal work space new flow control devices were located in the tundish virtual model. Numerical model and computational grid of tundish was performed in the Gambit application. The visualization of interaction of flow control devices on hydrodynamic conditions was received from numerical simulation. As a results of the computations carried out, liquid steel flow fields, turbulence intensity maps, steel temperature maps and RTD curves (E and F) were obtained. On the distribution of RTD characteristics, percentage contributions of stagnant, plug, ideal mixing flow type, and transition grade zone were calculated.Keywords: tundish, flow control devices, RTD characteristics, numerical modeling Artykuł przedstawia wyniki obliczeń komputerowych obrazujacych przepływ ciekłej stali w kadzi pośredniej. Jednowylewowa kadź posrednia jest przeznaczona do odlewania wlewków płaskich. Przestrzeń robocza kadzi pośredniej została zmodyfikowana i zabudowana dwoma urządzeniami sterującymi przepływem ciekłej stali. Pierwszym urządzeniem USP jest podstrumieniowy regulator turbulencji umieszczony w strefie zasilania kadzi pośredniej. Drugim urządzeniem jest przegroda z dwom oknami przelewowymi. Wykorzystywaną obecnie w warunkach przemysłowych przegrodę zmodyfikowano zmieniając jej wysokość. Dostosowane do przestrzeni wewnętrznej kadzi pośredniej nowe urządzenia sterujące przepływem umieszczono w wirtualnych modelach kadzi pośredniej. Modele numeryczne kadzi pośredniej i siatkę obliczeniową wykonano w programie Gambit. Wizualizację oddziaływania nowej zabudowy kadzi na warunki hydrodynamiczne uzyskano na bazie wyników otrzymanych z symulacji komputerowej przepływu ciekłej stali. W wyniku obliczeń komputerowych otrzymano charakterystyki w postaci krzywych RTD (E i F) oraz pól przepływu, intensywnosci trubulencji i temperatury ciekłej stali. Na podstawie rozkładu czasu przebywania stali w kadzi posredniej wyliczono udziały procentowe przepływów: stagnacyjnego, tłokowego, idealnego mieszania oraz zakres strefy przejściowej.

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A Practical Model for Predicting Intermixed Zone During Grade Transition

Cited by 13 publications

References 9 publications

Two-Phase Numerical Modeling of Grade Intermixing in a Steelmaking Tundish

Two-Phase Numerical Modeling of Grade Intermixing in a Steelmaking Tundish

Effect of Inflow Rate Variation on Intermixing in a Steelmaking Tundish during Ladle Change‐Over

Numerical Analysis of Liquid Steel Flow Structure in the One Strand Slab Tundish with Subflux Turbulence Controller and Dam

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