Volume 96, Number 5, December 2011
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||22 November 2011|
Viscous mechanism for Leidenfrost propulsion on a ratchet
Physique et Mécanique des Milieux Hétérogènes, UMR 7636 du CNRS, ESPCI - 75005 Paris, France, EU
2 Ladhyx, UMR 7646 du CNRS, École Polytechnique - 91128 Palaiseau Cedex, France, EU
3 Center for Smart Interfaces, Technische Universität Darmstadt - Petersenstraße 32, D-64287 Darmstadt, Germany, EU
Accepted: 7 October 2011
An evaporating drop placed on a ratchet self-propels, as discovered by Linke et al. in 2006. Sublimating platelets do the same, and we discuss here 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.
PACS: 83.50.Lh – Slip boundary effects (interfacial and free surface flows)
© EPLA, 2011
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.