estigation on the Convection Patte Liquid Steel in the Continuous Cast ndish by Theoretical Analysis, Wate Model Experiment and CFD Simulation D. Y. Sheng Lage Jonsson Process Metallurgy Department, MEFOS, S 97125, Lulea, Sweden Tel: 0046-920-201934 Fax: 0046-920-255832 Email: [email protected]PHOENICS User Conference MEFOS
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Investigation on the Convection Pattern of Liquid Steel in the Continuous Casting Tundish by Theoretical Analysis, Water Model Experiment and CFD Simulation.
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Investigation on the Convection Pattern of Liquid Steel in the Continuous Casting Tundish by Theoretical Analysis, Water Model Experiment and CFD Simulation
D. Y. Sheng Lage Jonsson
Process Metallurgy Department,MEFOS, S 97125, Lulea, Sweden
Problem Arisement Two different opinions:The steel flow in tundish is:1, Forced Convection System?OR2, Mixed Convection System?
Thermal conditions:
1, Heat loss 2, External heating and cooling3, Variation of inlet temperature
Objective
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CFD Causes to This Study !Two different flow pattern are on my screen
Is this true ?
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Theoretical Consideration
F
F
gl
u l
Grbouyancy
inertia
~( )* ( / )
( )* ( / )~Re
3 2
2 2 2 2
( / Re )( / )
( / ).Gr
gl T
ul
g T l
uTs
s
s
s s s
ss
23 2
2 2 474
( / Re )( / )
( / ).Gr
gl T
ul
g T l
uTw
w
w
w w w
ww
23 2
2 2 4 00
Dimensional Anaysis:
Tundish
Water Model
(1) Even one degree temperature difference in the tundish, buoyancy can not be ingored.(2) Water model can be used to simulate the convection pattern due to similar of this dimensionless number.
(1) Turbulence model of the transition region(2) Use the CFD model for real tundish simulation (3) Considersing the heat loss surrounding and additional heat source (4) Time dependent inlet temperature variation will be considered.
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Conclusion
(1) Dimensionless number Gr/Re 2 can be used to set up thermal similarity between water model and actual tundish(2) Thermal buoyancy driven flow is obvious in the non-isothermal water model (3) CFD simulation keeps good agreement with mesurement(4) The tundish is a mixed convection system