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Characterisation of the heat transfer for forced cooling

Andreas Mittermair

Andreas Mittermair

For the controlled cooling during the continuous casting of steel, spray cooling is used in the secondary cooling stage. The quality of the produced steel is significant influenced by the cooling regime itself. For this reason, the heat transfer of the spray cooling stage should be investigated in detail. For this purpose, a concept to measure the heat transfer coefficient should be developed.

The realized concept is based on a method using instationary conditions, i.e., a previously heated probe is cooled down for a short period of time. Within the probe, but located close to the measurement surface, there are some sensors that observe the temperature during the cooling phase. With known material parameters the conditions at the surface and furthermore the heat transfer coefficient can be estimated. An integrated heater is used to heat the probe to temperatures up to 1300°C.

Besides theoretical investigations, like studying the dynamic behavior of the used thermocouples, probes out of high thermal conductive ceramic were made. The material of the probe as well as the concept in general are proofed for their function and suitability.

Schematic of the spray cooling used for the contionous casting of steel. A steam film is formed above the hot strand surface.

Keywords: heat transfer coefficient, spray cooling, inverse problem

The circulation of the project work is restricted from July 25th, 2016 for a period of 5 years.

July 8th, 2016