Laser heating and evaporation of a levitated water drop

Abstract eng:
Single Water drops with initial diameter of approximately l-mm are acoustically levitated and subject to laser radiation from a 1070 nm cw laser with mean irradiance of 530 W/cmz. Effects of the radiation on the drop are measured using high speed video, and a beam profiler measures the corresponding effects of the drop on the laser beam. Turbulent convection within the drop is visible from the video, unlike what has been seen in prior laser heating experiments using smaller drops. Phase change begins immediately upon initiation of the laser strike, with no obvious sensible heating period. The drop evaporation rate is measured, and shows good agreement with a simple l-D laser heating model.

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