Numerical and Physical Modeling of Liquid Steel Active Flow in Tundish with Subflux Turbulence Controller and Dam

Hutny

Archives of Metallurgy and Materials

et al. 2016

Presented paper describes model investigations carried out on six-strand continuous casting tundish. Numerical analysis is based on simulations performed with the use of commercial code ANSYS Fluent. The analysis concerns determination of hydrodynamic conditions of the flow in the analysed tundish, with nominal capacity of 22 Mg, and its optimisation by modification of the flow structure in the tundish working area. Four different flow control devices (FCD) were proposed.Results of investigations presented in the paper include the distribution of velocity vectors and distribution of temperature and turbulence kinetic energy. Additionally, for more detailed comparative analysis, the macroscopic characteristics of residence time distribution (RTD) in the reactor, and the transition zone ranges were determined for each of the variants.

Section: Introductionmentioning

confidence: 99%

Optimization of Steel Flow in the Tundish by Modifying its Working Area

Hutny

Archives of Metallurgy and Materials

et al. 2016

Archives of Metallurgy and Materials

“…The presented characteristics confirm the good agreement between the results describing the hydrodynamic state of the examined facility according to the numerical simulations and the pattern recorded during the physical modelling. However, in some tundish furniture variants, a shift of the peaks of the E RTD curves obtained from the computer simulations relative to RTD characteristics recorded in the physical model was obtained [12]. In this connection, additional computer simulations were performed, in which the "Species" model was used for determining the RTD characteristics.…”

Section: Isothermal Simulation and Model Validationmentioning

confidence: 99%

Numerical And Physical Simulation Of Liquid Steel Behaviour In One Strand Tundish With Subflux Turbulence Controller

Cwudziński¹

2015

This paper presents the results of computer simulations (Ansys-Fluent) and laboratory experiments (physical water model) carried out to describe the motion of steel flow in the tundish. The facility under investigation is a single-nozzle slab tundish. The internal geometry of consider object was changed by flow control device i.e. subflux turbulence controller (STC). 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. From the performed computer simulations and laboratory experiments (physical modeling) it can be found that, the non-isothermal conditions occurring during continuous steel casting will definitely influence the hydrodynamic pattern forming in the tundishes with STC.

“…... (12) ... (13) . Where values of constants have been taken as, 16) Cμ =0.0845, αk=αε =1.39, C1ε =1.42, C2ε =1.68, ........ (15) Where η ≡ Sk/ε, η0 = 4.38, β = 0.012.…”

Section: Rng K-εmentioning

confidence: 99%

“…These turbulent properties helps eddy viscosity models to account for past effects like convection and diffusion of turbulent energy. A review of the literature on numerical modeling in tundish reveals that the most of researchers [9][10][11][12][13] used the standard k-ε turbulence model of Launder and Spalding. 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.…”

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.

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.