Leidenfrost Dynamics: Supplemental Video 13

A supplemental video from the 2013 review by David Quéré, "Leidenfrost Dynamics," from the Annual Review of Fluid Mechanics.

Approaching a piece of dry ice from a hot ratchet on which glass beads were deposited shows that the flow vapor is rectified by the ratchet: It mainly takes place in the direction toward the step, which suggests that the Leidenfrost body above is entrained by the vapor flow (viscous entrainment). Credits: Guillaume Dupeux, Christophe Clanet, and David Quéré.