Heat Transfer from a Hot Moving Steel Plate by Air-Atomized Spray Impingement

Abstract

Air-atomized spray cooling of a hot moving AISI 304 steel plate of 6 mm thickness has been investigated experimentally by varying water flow rate and plate velocity at a fixed nozzle-to-plate distance. It is found that the heat transfer coefficient is a non-linear function of surface temperature. The result shows that the cooling rate increases with an increase in the water flow rate. The highest cooling rate has been found for the static plate, whereas for a moving plate, an increasing cooling rate trend has been observed with increasing plate velocity.

Keywords::

• air-atomized spray
• boiling
• heat transfer coefficient
• Leidenfrost phenomena
• ultrafast cooling