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JOM

, Volume 70, Issue 10, pp 2139–2147 | Cite as

Transient, Multiphase Simulation of Grade Intermixing in a Tundish Under Constant Casting Rate and Validation Against Physical Modeling

  • Krashnavtar
  • D. Mazumdar
Multiphase Flows in Materials Processing

Abstract

Hydrodynamics and mixing phenomena in a tundish, during successive casting of two dissimilar grades of steel, from two different ladles, have been modeled mathematically. This necessitated modeling of three distinct, interconnected operating stages, including the steady-state casting period, the ladle change-over period (with inflow halted) and the intermixing period with a new ladle containing a different grade of steel. In these, a constant casting rate was considered throughout to accurately mimic prevalent industrial practice. This was accomplished by prescribing a time-dependent pressure field at the tundish outlet, deduced a priori through a pressure “predictor–corrector” scheme. Accordingly, appropriate user defined functions were developed and integrated in ANSYS Fluent™ to carry out numerical calculations. It is demonstrated that a transient, turbulent, volume of fluid calculation procedure, in conjunction with an appropriate pressure correction scheme, is adequate to simulate industrial grade intermixing operation at constant casting/throughput rates.

List of symbols

C1

Constants of k − ε turbulence model

C2

Constants of k − ε turbulence model

Cµ

Constants of k − ε turbulence model defined by Eq. 6

i

ith component

j

jth component

G

Generation of turbulence defined by Eq. 9

m

Mass fraction

P

Dynamic pressure referenced to local hydrostatic pressure

s

A species “s”

t

Time

to

Tundish emptying time defined by Eq. 14

v

Velocity vector

V

Volume

ΔV

Incremental volume

x

Coordinate axes

α

Phase volume fraction

ρl

Liquid density

ρmix

Mixture density

µ

Molecular viscosity

µt

Turbulent viscosity

µeff

Effective viscosity

ε

Dissipation rate of turbulence kinetic energy

σk

Constants of k − ε turbulence model

σε

Constants of k − ε turbulence model

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Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  1. 1.Research and Development, Essar Steel India LimitedSuratIndia
  2. 2.Department of Materials Science and EngineeringIndian Institute of TechnologyKanpurIndia

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