Heat Transfer Correlations for Secondary Cooling in Continuous Casting

• Published in: Steel research international Vol. 92; no. 3
• Main Authors: Kotrbacek, Petr, Bellerova, Hana, Luks, Tomas, Raudensky, Miroslav
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01.03.2021
• Subjects: Continuous casting; Cooling; Correlation; Density; Film boiling; Heat transfer coefficients; Hot surfaces; Impact loads; Impingement; Nozzles; secondary cooling; Spray casting; Spray cooling
• ISSN: 1611-3683; 1869-344X
• DOI: 10.1002/srin.202000465

The general term “spray cooling” is for the research presented here limited to the spray cooling of hot surfaces with film boiling, starting at temperatures of about 1200 °C and finishing at the Leidenfrost point where cooling intensity changes rapidly. This is typical area of secondary cooling in continuous casting. Herein, a correlation for Heat Transfer Coefficient (HTC). The most frequently used parameter of water impingement density is in the presented correlation used together with impact pressure to get good results. This study uses both water and mist nozzles. It is shown and experimentally verified why equations based only on the water impingement density cannot provide sufficiently precise predictions of HTC. Herein, a correlation for heat transfer coefficient is given. The results are valid for spray cooling of hot surfaces with film boiling, starting at temperatures of about 1200 °C and finishing at the Leidenfrost point. This study uses both water and mist nozzles. It is experimentally verified why equations based only on the water impingement density cannot provide sufficiently precise predictions of HTC.