Leidenfrost levitated liquid tori
1 Matière et Systèmes Complexes, CNRS and Université Paris Diderot UMR 7057 - Bâtiment Condorcet, 10 rue Alice Domon et Léonie Duquet, 75013 Paris, France, EU
2 Institut Langevin, CNRS, ESPCI ParisTech and Université Paris Diderot, UMR 7587 1 rue Jussieu, 75238 Paris Cedex 05, France, EU
Received: 18 October 2012
Accepted: 21 November 2012
Levitating a liquid over a vapor film was limited to droplets. Here we show that on curved substrates a larger quantity of fluid can be suspended. This opens a new possibility for exploring free-liquid-surface phenomena without any contact with a solid. In one of the simplest possible situations, a large fluid torus is levitated over a circular trough. A poloidal flow inside the ring generates a wave on its inner side, making it polygonal. This wave is described by a solitonic model which balances surface tension and the pressure depletion due to the distortion of the poloidal flow.
PACS: 47.55.D− – / 47.85.mf – / 47.55.pf –
© EPLA, 2012