Reactive Leidenfrost droplets
Université Nice Sophia Antipolis, CNRS, LPMC, UMR 7336 - Parc Valrose, 06100 Nice, France
Received: 1 February 2016
Accepted: 26 May 2016
We experimentally investigate the reactivity of Leidenfrost droplets with their supporting substrates. Several organic liquids are put into contact with a copper substrate heated above their Leidenfrost temperature. As the liquid evaporates, the gaseous flow cleans the superficial copper oxide formed at the substrate surface and the reaction maintains a native copper spot below the evaporating droplet. The copper spot can reach several times the droplet size for the most reactive organic compounds. This study shows an interesting coupling between the physics of the Leidenfrost effect and the mechanics of reactive flows. Different applications are proposed such as drop motion tracking and vapor flow monitoring.
PACS: 68.03.Cd – Surface tension and related phenomena / 68.03.Fg – Evaporation and condensation of liquids / 47.55.D- – Drops and bubbles
© EPLA, 2016