scholarly journals A FERRITE POTENTIAL INFLUENCE ON HEAT TRANSFER CONDITIONS IN INDUSTRIAL MOLD DURING THE CONTINUOUS CASTING OF STEELS

2009 ◽  
Vol 8 (1) ◽  
pp. 18
Author(s):  
V. Karlinski ◽  
W. Fogazzi ◽  
B. V. De Souza ◽  
C. R. F. Ferreira ◽  
C. A. Dos Santos ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Continuous Casting ◽  
Processing System ◽  
Carbon Steels ◽  
Structure Characterization ◽  
Metal Mold ◽  
Transfer Coefficients ◽  
Metallographic Examination ◽  
Heat Transfer Coefficients ◽  
Numerical Predictions

This paper aims to apply a solidification mathematical model to the process of the continuous casting of steel. Heat transfer coefficients in the mold were determined by the inverse method and they are related with both macrostructure conditions and carbon equivalents of carbon steels from peritectic reactions. Both structure characterization and ferrite potential were established by solidification parameters and chemical composition after casting. Samples were cut at different positions of the metal/mold interface, whereas the selected sections were polished and etched with a reagent for the metallographic examination. The image processing system was used to analyze as-cast structure for every selected position. It was observed that during casting, numerical predictions about metal/mold heat transfer coefficients along the mold are in accordance with type-A and B steels ferrite potential, due to both its sticking and depression tendency.

scholarly journals Heat flow and heat transfer coefficient during crystallization under the pressure

2018 ◽  
Vol 157 ◽  
pp. 02036
Author(s):  
Richard Pastirčák ◽  
Ján Ščury ◽  
Tomáš Fecura
Keyword(s):  
Heat Transfer ◽  
Heat Flow ◽  
Solidification Process ◽  
Metal Mold ◽  
Transfer Coefficients ◽  
Microstructure Modeling ◽  
Heat Transfer Coefficients ◽  
Flow And Heat Transfer ◽  
Solidification Processes ◽  
Precise Prediction

Estimation of the heat flow at the metal-mold interface is necessary for accurate simulation of the solidification processes. For the numerical simulation, a precise prediction of boundary conditions is required to determine the temperature distribution during solidification, porosity nucleation, microstructure development, and residual stresses. Determination of the heat transfer coefficients at the metal-mold interface is a critical aspect for simulation of the solidification process and the microstructure modeling of the castings. For crystallization under the pressure and for thin-walled castings, HTC evaluation is important due to the very limited freezing time.

Toward the Detailed Simulation of the Heat Transfer Processes in Unsaturated Porous Media

2009 ◽  
Author(s):  
F. A. Jafar ◽  
G. R. Thorpe ◽  
O¨. F. Turan
Keyword(s):  
Heat Transfer ◽  
Porous Media ◽  
Unsaturated Porous Media ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Transfer Processes ◽  
Numerical Predictions ◽  
Three Phase ◽  
Detailed Simulation ◽  
Horizontal Cylinders

Trickle bed chemical reactors and equipment used to cool horticultural produce usually involve three phase porous media. The fluid dynamics and heat transfer processes that occur in such equipment are generally quantified by means of empirical relationships between dimensionless groups. The research reported in this paper is motivated by the possibility of using detailed numerical simulations of the phenomena that occur in beds of irrigated porous media to obviate the need for empirical correlations. Numerical predictions are obtained using a CFD code (FLUENT) for 2-D configurations of three cylinders. Local and mean heat transfer coefficients around these non-contacting horizontal cylinders are calculated numerically. The present results compare well with those available in the literature. The numerical results provide an insight into the cooling mechanisms within beds of unsaturated porous media.

Analysis of metal mould heat transfer coefficients during continuous casting of steel

2010 ◽  
Vol 37 (1) ◽  
pp. 47-56 ◽  
Author(s):  
V. K. de Barcellos ◽  
C. R. F. Ferreira ◽  
C. A. dos Santos ◽  
J. A. Spim
Keyword(s):  
Heat Transfer ◽  
Continuous Casting ◽  
Continuous Casting Of Steel ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients

Metal–mold heat transfer coefficients during horizontal and vertical Unsteady-State solidification of Al–Cu and Sn–Pb Alloys

2004 ◽  
Vol 12 (3) ◽  
pp. 279-296 ◽  
Author(s):  
Carlos A. Santos ◽  
Cláudio A. Siqueira ◽  
Amauri Garcia ◽  
José M.V. Quaresma ◽  
Jaime A. Spim
Keyword(s):  
Heat Transfer ◽  
Unsteady State ◽  
Metal Mold ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients

The Effect of the Thermal Boundary Condition on Transient Method Heat Transfer Measurements on a Flat Plate With a Laminar Boundary Layer

1996 ◽  
Vol 118 (4) ◽  
pp. 831-837 ◽  
Author(s):  
R. J. Butler ◽  
J. W. Baughn
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Boundary Condition ◽  
Thermal Boundary Condition ◽  
Uniform Heat Flux ◽  
Transient Method ◽  
Uniform Temperature ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Numerical Predictions

The heat transfer coefficient distribution on a flat plate with a laminar boundary layer is investigated for the case of a transient thermal boundary condition (such as that produced with the transient measurement method). The conjugate problem of boundary layer convection with simultaneous wall conduction is solved numerically, and the predicted transient local heat transfer coefficients at several locations are determined. The numerical solutions for the surface temperature are used to determine the Nusselt number that would be measured in a transient method experiment for a range of (nondimensionalized) surface measurement temperatures (liquid crystal temperatures when they are used as the surface sensor). These predicted transient method results are compared to the well-known results for uniform temperature and uniform heat flux thermal boundary conditions. Measurements are made and compared to the numerical predictions using a shroud (transient) experimental technique for a range of nondimensional surface temperatures. The numerical predictions and measurements compare well and both demonstrate the strong effect of the (nondimensional) surface temperature on transient method measurements. Transient method measurements will give heat transfer coefficients that range from as low as that of the uniform temperature case to higher than that of the uniform heat flux case (a 36 percent difference). These results demonstrate the importance of the temperatures used with the transient method.

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