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Development of a mathematical model for the prediction of the heat transfer coefficient during spray cooling of hot steel surfaces
Oberta, Brian ; Resl, Ondřej (referee) ; Chabičovský, Martin (advisor)
Spray cooling of hot surfaces is used in the metallurgical industry for continuous casting, hot rolling and heat treatment. The water is sprayed by the nozzle on the cooled surface. Physically speaking, the process of cooling can be characterized as forced convection with the presence of the boiling. The spray cooling is influenced by the factors depanding on characteristics of cooling liquid (water impingement density, water temperature, droplet size, impact velocity) and characteristics of cooled surface (surface temperature, surface roughness, presence of oxides, type of material). In the moment, there are not exact physical equation which can precisly describe the complicated process of heat transfer during spray boiling. This thesis deals with the creation of the model for prediction of the heat transfer coefficient during film boiling and the model for prediction of the Leidenfrost temperature. These models are depending on characteristics of spray cooling. The creation of the models is based on experimentaly mesured data. My created models are then compared with already published models.
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