Water Droplets (1 of 2) (IMAGE)

American Institute of Physics

Water Droplets (1 of 2)

Caption

These are micrographs showing water droplets landing on specially designed silicon surfaces (top images) at different temperatures. At higher temperatures, the droplets begin to exhibit a new behavior: instead of boiling, they bounce on a layer of vapor, never really wetting and cooling the surface. At 400 C, the droplet continues to boil only on the surface that combines microscale posts with a coating of nanoscale particles (last column). These results demonstrate that this micro nano surface can be effectively cooled even at high temperatures.

Credit

K.Varanasi/MIT

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