Sessile droplet evaporation on superheated superhydrophobic surfaces
Abstract
This fluid dynamics video depicts the evaporation of sessile water droplets placed on heated superhydrophobic (SH) surfaces of varying cavity fraction, Fc, and surface temperature, Ts, above the saturation temperature, Tsat. Images were captured at 10,000 FPS and are played back at 30 FPS in this video. Teflon-coated silicon surfaces of Fc = 0, 0.5, 0.8, and 0.95 were used for these experiments. Ts ranging from 110C to 210C were studied. The video clips show how the boiling behavior of sessile droplets is altered with changes in surface microstructure. Quantitative results from heat transfer rate experiments conducted by the authors are briefly discussed near the end of the video.
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