Air-levitated platelets: from take off to motion

A plate placed above a porous substrate through which air is blown can levitate if the airflow is strong enough. We first model the flow needed for taking off, and then examine how an asymmetric texture etched on the porous surface induces directional motion of the hovercraft. We discuss how the texture design impacts the propelling efficiency, and how it can be used to manipulate these frictionless objects both in translation and in rotation.

[1]  K. Sakata,et al.  FT-IR emissivity measurements of Nb melt using an electrostatic levitation furnace , 2015 .

[2]  G. Wells,et al.  A sublimation heat engine , 2015, Nature Communications.

[3]  J. Snoeijer,et al.  Physics of the granite sphere fountain , 2014 .

[4]  C. Clanet,et al.  Surfing on a herringbone , 2013 .

[5]  D. van der Meer,et al.  Oscillating and star-shaped drops levitated by an airflow. , 2013, Physical review. E, Statistical, nonlinear, and soft matter physics.

[6]  Jie Xu,et al.  Leidenfrost levitation: beyond droplets , 2012, Scientific Reports.

[7]  C. Wang.  A porous slider with velocity slip , 2012 .

[8]  S. Hardt,et al.  Propulsion mechanisms for Leidenfrost solids on ratchets. , 2012, Physical review. E, Statistical, nonlinear, and soft matter physics.

[9]  James A Bankson,et al.  Three-dimensional tissue culture based on magnetic cell levitation. , 2010, Nature nanotechnology.

[10]  G. Neitzel,et al.  Optical levitation and transport of microdroplets: Proof of concept , 2008 .

[11]  B. Alemán,et al.  Self-propelled Leidenfrost droplets. , 2006, Physical review letters.

[12]  U. Lange,et al.  Static shapes of levitated viscous drops , 2005, Journal of Fluid Mechanics.

[13]  J. Ockendon,et al.  Inertial levitation , 2004, Journal of Fluid Mechanics.

[14]  C. Waltham,et al.  "Bernoulli" Levitation , 2002, physics/0206025.

[15]  E. Brandt,et al.  Acoustic physics: Suspended by sound , 2001, Nature.

[16]  E. Hinch,et al.  The effect of viscosity on the height of disks floating above an air table , 1994, Journal of Fluid Mechanics.

[17]  J. Troadec,et al.  An air table designed to study two-dimensional disc packings: preliminary tests and first results , 1990 .

[18]  E. Brandt.  Levitation in Physics , 1989, Science.

[19]  V. Khanin,et al.  A liquid drop on an air cushion as an analogue of Leidenfrost boiling , 1986, Journal of Fluid Mechanics.

[20]  Johann Gottlob Leidenfrost.  On the fixation of water in diverse fire , 1966 .