Self-propelled Leidenfrost droplets |
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| Authors: | Linke H Alemán B J Melling L D Taormina M J Francis M J Dow-Hygelund C C Narayanan V Taylor R P Stout A |
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| Institution: | Materials Science Institute and Physics Department, University of Oregon, Eugene, Oregon 97405-1274, USA. linke@uoregon.edu |
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| Abstract: | We report that liquids perform self-propelled motion when they are placed in contact with hot surfaces with asymmetric (ratchetlike) topology. The pumping effect is observed when the liquid is in the Leidenfrost regime (the film-boiling regime), for many liquids and over a wide temperature range. We propose that liquid motion is driven by a viscous force exerted by vapor flow between the solid and the liquid. |
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