Abstract
The solidification and cooling of a continuously cast billet and the simultaneous heating of the mold is a very complicated problem of three-dimensional (3D) transient heat and mass transfer. The solving of uch a problem is impossible without numerical models of the temperature field of the concasting itself which it is being processed through the concasting machine (caster). The application of the numerical model requires systematic experimentation and measurement of operational parameters on a real caster as well as in the laboratory. The measurement results, especially temperatures, serve not only for the verification of the exactness of the model, but mainly for optimization of the process procedure. The most important part of the investigation is the measurement of the temperatures in the walls of the mold and the surface of the slab in the zones of secondary and tertiary cooling.
Highlights
The optimization of production on casters, with the aim of achieving maximum savings and maximum quality of the product is unthinkable without knowledge of the course of solidification and cooling of the concasting [1,2,3]
The temperature field in the concasting is determined by using the transient 3D enthalpy balance equation with the Finite Differences Method
The values of the heat-transfer coefficient (HTC) underneath the water jets were obtained via an inverse task which used the temperatures measured in the cooled surface. (The calculated HTCs are a function of the surface temperature.) These measurements were conducted for various operation conditions, i.e. the pressure of the water and the shift rate
Summary
The optimization of production on casters, with the aim of achieving maximum savings and maximum quality of the product is unthinkable without knowledge of the course of solidification and cooling of the concasting [1,2,3]. The temperature field in the concasting is determined by using the transient 3D enthalpy balance equation with the Finite Differences Method. It depends on the alloy composition and its thermophysical properties as well as on the cooling rate and shift rate [4,5,6,7,8]. Based on the results of previous investigations, the boundary conditions are set identically within each zone individually. This requires a very fine grid, which leads to a large number of equations to solve
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