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Heat and Mass Transfer

, Volume 47, Issue 12, pp 1601–1609 | Cite as

The effects of casting speed on steel continuous casting process

  • Mohammad SadatEmail author
  • Ali Honarvar Gheysari
  • Saeid Sadat
Original

Abstract

A three dimensional simulation of molten steel flow, heat transfer and solidification in mold and “secondary cooling zone” of Continuous Casting machine was performed with consideration of standard k−ε model. For this purpose, computational fluid dynamics software, FLUENT was utilized. From the simulation standpoint, the main distinction between this work and preceding ones is that, the phase change process (solidification) and flow (turbulent in mold section and laminar in secondary cooling zone) have been coupled and solved jointly instead of dividing it into “transient heat conduction” and “steady fluid flow” that can lead to more realistic simulation. Determining the appropriate boundary conditions in secondary cooling zone is very complicated because of various forms of heat transfer involved, including natural and forced convection and simultaneous radiation heat transfer. The main objective of this work is to have better understanding of heat transfer and solidification in the continuous casting process. Also, effects of casting speed on heat flux and shell thickness and role of radiation in total heat transfer is discussed.

Keywords

Heat Transfer Continuous Casting Mushy Zone Molten Steel Casting Speed 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of symbols

C1, C2, C3

Constant

cp

Specific heat at constant pressure [J/(kg.K)]

g

Magnitude of gravity [m/s2]

h

Sensible enthalpy

href

Reference enthalpy

hext

Convection coefficient

H

Enthalpy

K

Conductivity [W/(K.m)]

L

Latent heat of the material [J/kg]

ΔH

Latent heat [J/kg]

Qw

Water flow rate in spray zone [L/(m2.K)]

S

Sink Term

T

Temperature [K]

Tsolidus

Temperature [K]

Tliquidus

Temperature [K]

Tref

Reference temperature [K]

Tsurface

Surface temperature [K]

Tambient

Ambient temperature [K]

Tspray

Temperature of the spray cooling [C]

hnat

Natural convection heat-transfer coefficient [W/(m2.K)]

hspray

Spray cooling heat-transfer coefficient [W/(m2.K)]

Text

Cooling water temperature [K]

u

Velocity component [m/s]

\( \overrightarrow {\upsilon } \)

Fluid velocity [m/s]

\( \overrightarrow {{\upsilon_{p} }} \)

Pull velocity [m/s]

P

Pressure field [N/m2]

y+

Non-dimensional cell size at the wall

y

Distance from the wall

Greek symbols

α

Machine dependent calibration factor

β

Liquid fraction

ρ

Density [kg/m3]

μo

Laminar viscosity [kg/(m.s)]

μt

Turbulence viscosity [kg/(m.s)]

k

Transport of turbulent kinetic energy [m2/s2]

ε

Dissipation rate of kinetic energy [m2/s3]

εR

Surface Emissivity

σ

Stefan-Boltzmann coefficient [W/(m2.K4)]

ϕ

Turbulent parameter that is solved

Subscripts

i, j

Coordinate direction indices, which when repeated in a term, imply the summation of all three possible terms

Notes

Acknowledgments

The authors would like to express their gratitude to the supporters of this work especially H. Ajam and S. Seyyedy.

References

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Mohammad Sadat
    • 1
    Email author
  • Ali Honarvar Gheysari
    • 1
  • Saeid Sadat
    • 1
  1. 1.Department of Mechanics, Mashhad BranchIslamic Azad UniversityMashhadIran

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