2019 Pittsburgh AISTech

The Effect of Standoff Distance on the Cooling Efficiency of Air Mist and Hydraulic Nozzles (Room 407)

07 May 19
2:00 PM - 2:30 PM

Tracks: Continuous Casting

Speaker(s): Kenneth Blazek, ArcelorMittal; Rudolf Moravec, ArcelorMittal

Heat transfer coefficients (HTCs) for water spray nozzles in continuous casters are primarily based upon the water flux density on the surface of the slab. ArcelorMittal uses directly measured HTCs. Based on directly measuring HTCs of nozzles at different standoff distances, it can be shown that nozzles have a critical standoff distance, above which HTCs will not change with water flow density. Hence any spray cooling zone in which these nozzles are used above their critical standoff distance will not provide any control of the surface temperature.