Physical and mathematical models of steel flow and heat transfer in a tundish heated by plasma

Barrón-Meza, M. A.; Barreto-Sandoval, J. de J.; Morales, R. D.

doi:10.1007/s11663-000-0131-y

Cited by 33 publications

(21 citation statements)

References 11 publications

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“…For the non-isothermal conditions of steel flow through the tundish, the magnitudes of heat fluxes on particular tundish walls and bottom have been determined to be -2600 W/m 2 , whereas on the regulator walls -1750 W/m 2 . The losses on the free metal table surface are -15000 W/m 2 [9][10][11][12][13][14][15][16][17]. The wall condition with zero tangential stress was assumed on the free steel table surface.…”

Section: Testing Methodologymentioning

confidence: 99%

Piv Method and Numerical Computation for Prediction of Liquid Steel Flow Structure in Tundish

Cwudziński

2015

Archives of Metallurgy and Materials

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This paper presents the results of computer simulations and laboratory experiments carried out to describe the motion of steel flow in the tundish. The facility under investigation is a single-nozzle tundish designed for casting concast slabs. For the validation of the numerical model and verification of the hydrodynamic conditions occurring in the examined tundish furniture variants, obtained from the computer simulations, a physical model of the tundish was employed. State-of-the-art vector flow field analysis measuring systems developed by Lavision were used in the laboratory tests. Computer simulations of liquid steel flow were performed using the commercial program Ansys-Fluent R . In order to obtain a complete hydrodynamic picture in the tundish furniture variants tested, the computer simulations were performed for both isothermal and non-isothermal conditions.Keywords: tundish, steel flow, numerical simulation, PIV method W pracy przedstawiono wyniki symulacji numerycznej i eksperymentów laboratoryjnych opisujących ruch stali w kadzi pośredniej. Analizowanym obiektem była jedno-wylewowa kadź pośrednia przeznaczona do odlewania wlewków płaskich. Do walidacji modelu numerycznego i weryfikacji warunków hydrodynamicznych występujących w analizowanych wariantach zabudowy kadzi pośredniej zastosowano symulacje komputerowe i fizyczny model kadzi pośredniej. W eksperymentach laboratoryjnych do analizy wektorowego pola przepływu zastosowano system pomiarowy firmy Lavision. Symulacje komputerowe przepływu ciekłej stali wykonano programem Ansys-Fluent R . W celu zyskania pełnego obrazu hydrodynamiki ruchu stali w analizowanym obiekcie symulacje komputerowe wykonano dla warunków izotermicznych i nieizotermicznych.

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Section: Testing Methodologymentioning

confidence: 99%

Piv Method and Numerical Computation for Prediction of Liquid Steel Flow Structure in Tundish

Cwudziński

2015

Archives of Metallurgy and Materials

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“…In non-isothermal computation, Bussinesq's model was employed, which is described by equation (7) 16,17,[29][30][31][32][33][34][35] For the description of the turbulence of steel flow through the tundish, the k-e turbulence model was adopted, whose semiempirical constants take on the following values: C 1 5 1?44, C 2 51?92, s k 51?0 and s e 51?3. The turbulence model included buoyancy effects on the generation of k and e in the solving flow field using the generation G B .…”

Section: Testing Methodologymentioning

confidence: 99%

Numerical simulation of liquid steel flow and behaviour of non-metallic inclusions in one-strand slab tundish with subflux turbulence controller and gas permeable barrier

Cwudziński

2010

Ironmaking & Steelmaking

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Numerical simulation of liquid steel flow and behaviour of non-metallic inclusions in onestrand slab tundish with subflux turbulence controller and gas permeable barrier A. Cwudziń ski* The paper presents computation results from the simulation of liquid steel flow in a one-strand slab tundish used in a Polish steel plant. This is a wedge type tundish with a depression in the bottom of the discharge zone. Fluent software was used for solving the mathematical model of the casting process, and Euler-Lagrange description was chosen for the description of interactions between the continuous phase (liquid steel) and the discrete phase (inert gas). To verify the mathematical model and the numerical simulation results, test results obtained from industrial experiments were applied. The internal geometry of the facility under consideration was changed by two types of flow control devices, a subflux turbulence controller and a gas permeable barrier mounted on the tundish bottom. A number of variants were tested including flowrate and position of the argon. For all variants of modification, the quantity of non-metallic inclusions removed from liquid steel has been obtained.

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“…The dead fraction volume is then calculated through [3] The volume fraction with plug flow is estimated as [4] The volume fraction with mixed flow is the complement to one: [5] The results are presented in Table I. As seen in this table, the plug volume fraction without gas bubbling is very high, just as was originally planned, due to the influence of the inhibitor.…”

Section: A Time Distribution Curvesmentioning

confidence: 99%

“…Barreto et al [3,4] provided information of fluid flow in tundishes using water model and mathematical simulations. Barron et al [5] characterized, through water modeling and mathematical simulations, the thermal stratification in plasma-heated tundishes. Chakraborty and Sahai [6,7] simulated the effects of varying ladle stream temperature on steel flow in tundishes and reported delayed radical changes of fluid flow pattern due to buoyancy forces.…”

Section: Introductionmentioning

confidence: 99%

Inertial and buoyancy driven water flows under gas bubbling and thermal stratification conditions in a tundish model

Vargas-Zamora

Palafox-Ramos

Morales

et al. 2004

Metall Mater Trans B

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Steel flow dominated by inertial and buoyancy flows under gas bubbling and thermal stratification conditions, in a one-strand tundish, was studied using a 2/5 scale water model. The use of a turbulence inhibitor yields plug flow volume fractions well above 40 pct for a casting rate of 3.12 tons/min under isothermal conditions. Small flow rates of gas injection (246 cm 3 /min), through a gas curtain, improved the fluid flow by enhancing the plug flow volume fraction. Higher flow rates originated an increase of back-mixing flow, thus forming recirculating flows in both sides of this curtain.Step inputs of hot water drove streams of this fluid toward the bath surface due to buoyancy forces. A rise in gas flow rate led to a thermal homogenization in two separated cells of flow located at each side of the gas curtain.Step inputs of cold water drove streams of fluid along the tundish bottom. Use of the gas curtain homogenized the lower part of the tundish as well as the upper part of the bath at the left side of the curtain. However, temperature at the top corner of the tundish, in the outlet box, remained very different than the rest of the temperatures inside this tundish. High gas flow rates (912 cm 3 /min) were required to homogenize the bath after times as long as twice the mean residence time of the fluid. Particle image velocimetry (PIV) measurements corroborated the formation of recirculating flows at both sides of the gas curtain.

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Physical and mathematical models of steel flow and heat transfer in a tundish heated by plasma

Cited by 33 publications

References 11 publications

Piv Method and Numerical Computation for Prediction of Liquid Steel Flow Structure in Tundish

Piv Method and Numerical Computation for Prediction of Liquid Steel Flow Structure in Tundish

Numerical simulation of liquid steel flow and behaviour of non-metallic inclusions in one-strand slab tundish with subflux turbulence controller and gas permeable barrier

Inertial and buoyancy driven water flows under gas bubbling and thermal stratification conditions in a tundish model

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