Aerodynamic Leidenfrost effect

Anaïs Gauthier (1) , James Bird , Christophe Clanet (2) , David Quéré (1)

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

When deposited on a plate moving quickly enough, any liquid can levitate as it does when it is volatile on a very hot solid (Leidenfrost effect). In the aerodynamic Leidenfrost situation, air gets inserted between the liquid and the moving solid, a situation that we analyze. We observe two types of entrainment. (i) The thickness of the air gap is found to increase with the plate speed, which is interpreted in the Landau-Levich-Derjaguin frame: Air is dynamically dragged along the surface and its thickness results from a balance between capillary and viscous effects. (ii) Air set in motion by the plate exerts a force on the levitating liquid. We discuss the magnitude of this aerodynamic force and show that it can be exploited to control the liquid and even to drive it against gravity.

Domaines: Sciences de l'ingénieur [physics]; Milieux fluides et réactifs

Anaïs Gauthier, James Bird, Christophe Clanet, David Quéré. Aerodynamic Leidenfrost effect. Physical Review Fluids, 2016, 1 (8), ⟨10.1103/PhysRevFluids.1.084002⟩. ⟨hal-02356925⟩