Session H6: Drops VI: Thermal Effects
10:30 AM–12:40 PM, Monday, November 21, 2011
Room: 309
Chair: Detlef Lohse, University of Twente
Abstract ID: BAPS.2011.DFD.H6.4
Abstract: H6.00004 : Viscous mechanism for Leidenfrost propulsion on a ratchet
11:09 AM–11:22 AM
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Abstract 
Authors:
Guillaume Dupeux
(Physique et Mecanique des Milieux Heterogenes, CNRS, ESPCI, Paris France \& Ladhyx, CNRS, Ecole Polytechnique, Palaiseau, France)
Christophe Clanet
(Physique et Mecanique des Milieux Heterogenes, CNRS, ESPCI, Paris France \& Ladhyx, CNRS, Ecole Polytechnique, Palaiseau, France)
Steffen Hardt
(Center of Smart Interfaces, Technische Universitat Darmstadt, Germany)
David Quere
(Physique et Mecanique des Milieux Heterogenes, CNRS, ESPCI, Paris France \& Ladhyx, CNRS, Ecole Polytechnique, Palaiseau, France)
An evaporating drop placed on a ratchet shaped substrate self-propels, as discovered by Linke et al. in 2006. Sublimating platelets of dry ice do the same, and we discuss a possible viscous mechanism for these motions. We report that the flow of vapor below the levitating material is rectified by the asymmetric teeth of the ratchet, in the direction of descending slopes along each tooth. As a consequence, the resulting viscous stress can entrain the material in the same direction, and we discuss the resulting self-propelling force.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.DFD.H6.4