Abstract
A transient film boiling model was developed to study the film boiling dynamics that would occur when a molten, spherical fuel droplet is immersed in a coolant. The focus of this study was to investigate the effects of noncondensable gas, coolant temperature and ambient pressure on film boiling during the initial growth phase. These parameters were found to have the greatest influence on the triggering of the small scale fuel-coolant interactions. The results indicate that the film generally stabilizes with more noncondensable gas present and higher coolant temperatures. Our calculations indicate that small ambient pressurizations cause violent fluctuation of the film pressure while higher ambient pressures suppress these oscillations. These results are in good agreement with Nelson's experimental data for a single fuel droplet in water.
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