Metallurgy, Vol. 48 No. 4, 2009.
Original scientific paper
Heat transfer during cooling of hot surfaces by water nozzles
M. Pøíhoda
; Faculty of Metallurgy and Materials Engineering, VŠB-TU Ostrava, Czech Republic
J. Molínek
; Faculty of Metallurgy and Materials Engineering, VŠB-TU Ostrava, Czech Republic
R. Pyszko
; Faculty of Metallurgy and Materials Engineering, VŠB-TU Ostrava, Czech Republic
M. Velička
; Faculty of Metallurgy and Materials Engineering, VŠB-TU Ostrava, Czech Republic
M. Vaculík
; Faculty of Metallurgy and Materials Engineering, VŠB-TU Ostrava, Czech Republic
J. Burda
; Faculty of Metallurgy and Materials Engineering, VŠB-TU Ostrava, Czech Republic
Abstract
Method of cooling in a secondary zone of continuous casting of steel has a significant influence on a quality of continuously cast products mainly from the point of view of internal and surface defects as well as zonal segregations. At the department of thermal engineering, a physical model of the secondary zone has been developed, which enables testing of both water and water-air nozzles. During laboratory measurements cooling effects of a cone nozzle have been expressed by means of three parameters. Most commonly used parameter is an admission characteristic, infrequently heat transfer coefficient is determined and newly a measuring of dynamic impact of the cooling water has been introduced.
Keywords
heat transfer coefficient; cooling of surface; nozzle; continuous casting of steel
Hrčak ID:
38687
URI
Publication date:
1.10.2009.
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