Reshaping and capturing Leidenfrost drops with a magnet

Keyvan Piroird (1, 2) , Baptiste Darbois Texier (1, 2) , Christophe Clanet (2, 1) , David Quéré (1, 2)

1 LadHyX - Laboratoire d'hydrodynamique
2 PMMH - Physique et mécanique des milieux hétérogenes (UMR 7636)

Liquid oxygen, which is paramagnetic, also undergoes Leidenfrost effect at room temperature. In this article, we first study the deformation of oxygen drops in a magnetic field and show that it can be described via an effective capillary length, which includes the magnetic force. In a second part, we describe how these ultra-mobile drops passing above a magnet significantly slow down and can even be trapped. The critical velocity below which a drop is captured is determined from the deformation induced by the field. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4796133]

Domains: Physics [physics]; Mechanics [physics]; Fluid mechanics [physics.class-ph]; Engineering Sciences [physics]; Mechanics [physics.med-ph]; Fluids mechanics [physics.class-ph]

Keyvan Piroird, Baptiste Darbois Texier, Christophe Clanet, David Quéré. Reshaping and capturing Leidenfrost drops with a magnet. Physics of Fluids, 2013, 25 (3), pp.032108. ⟨10.1063/1.4796133⟩. ⟨hal-00996481⟩