Leidenfrost levitation: beyond droplets.

Abstract:

:Friction is a major inhibitor in almost every mechanical system. Enlightened by the Leidenfrost effect - a droplet can be levitated by its own vapor layer on a sufficiently hot surface - we demonstrate for the first time that a small cart can also be levitated by Leidenfrost vapor. The levitated cart can carry certain amount of load and move frictionlessly over the hot surface. The maximum load that the cart can carry is experimentally tested over a range of surface temperatures. We show that the levitated cart can be propelled not only by gravitational force over a slanted flat surface, but also self-propelled over a ratchet shaped horizontal surface. In the end, we experimentally tested water consumption rate for sustaining the levitated cart, and compared the results to theoretical calculations. If perfected, this frictionless Leidenfrost cart could be used in numerous engineering applications where relative motion exists between surfaces.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Hashmi A,Xu Y,Coder B,Osborne PA,Spafford J,Michael GE,Yu G,Xu J

doi

10.1038/srep00797

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

797

issn

2045-2322

journal_volume

2

pub_type

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