Continuous Casting Secondary Cooling: Real-Time Simulation of Local Strand Temperatures
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Real time simulation of strand temperatures is a common practice to adopt the cooling nozzle flow rates according to the desired strand surface temperatures. Usually only a smooth strand temperature is simulated by distributing the cooling heat fluxes smoothly over the strand surface. This simplification saves calculation time and is easier to use for control algorithms. In reality, the strand surface temperature rises in areas without cooling and drops in the impingement area of the spray cooling nozzle and during the roll contact. These temperature fluctuations can reach a few hundred degrees (peek to peek). Sometimes it is important to know the real, locally varying temperatures resulting from the inhomogeneous cooling heat flux distribution. One reason is that especially for higher cooling rates, the heat flux depends on the surface temperature and therefore, the local temperatures are needed to correctly consider the cooling heat flux. An algorithm is presented that allows a real time calculation of the local temperatures based on smooth temperature simulation results. These results can be used in enhanced cooling heat flux calculations, considering the surface temperature influence gained from measurements.