| Systemic experiments were conducted for the spray cooling of high temperature metal under high mass flux industrial sprays. Commercial hydraulic full cone, hydraulic fan and air atomized fan spray nozzles were studied at high local mass flux up to 30 kg/m2sec. Two cylindrical stainless steel plates, one 10.5 cm in diameter and 2.5 cm thick and one 5 cm in diameter and 3.8 cm thick were studied at temperature up to 1100 C. Thermocouples were installed through the back of the plates to record the temperature histories. Data was deduced using direct and inverse numerical heat conduction schemes. A large database was established covering all three nozzles for a wide range of conditions. At the low mass flow rates, two orientations to gravity were tested. Heat transfer at the center and edge of sprays was studied. It was found that the heat flux at the Leidenfrost point and maximum heat flux are very strongly dependent upon the local mass flux. Correlations for heat flux beyond the Leidenfrost temperature, the Leidenfrost temperature, the minimum heat flux, maximum heat flux and critical temperature are presented as a function of local mass flux. |
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