title: Thermally driven flows between a Leidenfrost solid and a ratchet surface.
abstract: The significance of thermally driven flows for the propulsion of Leidenfrost solids on a ratchet surface is studied based on a numerical solution of the Boltzmann equation. The resulting flow patterns are dominated by vortices developing at the edges of the ratchet teeth. In a previous analysis it had been claimed that thermally driven flows could cause the propulsion of Leidenfrost objects. In contrast to that analysis, it is found that such flows make an insignificant contribution to the thrust of Leidenfrost solids on ratchet surfaces, which is dominated by the pressure-driven flow due to the sublimating solid.
authors.affiliation: Center of Smart Interfaces, TU Darmstadt, Petersenstrasse 17, D-64287 Darmstadt, Germany.
authors.forename: Steffen
authors.initials: S
authors.lastname: Hardt
authors.forename: Sudarshan
authors.initials: S
authors.lastname: Tiwari
authors.forename: Tobias
authors.initials: T
authors.lastname: Baier