Berlin 2018 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 70: Poster: Flows, Patterns, Delay, Reaction Diffusion
DY 70.6: Poster
Donnerstag, 15. März 2018, 15:30–18:00, Poster A
Leidenfrost universality: an experimental study — •Olinka J. Ramírez Soto1, Michiel A.J. van Limbeek2, and Detlef Lohse2 — 1Max Planck Institute for Dynamics and Self-Organization (MPIDS), Am Faßberg 17, D-37077 Göttingen, Germany — 2Universiteit Twente, Drienerlolaan 5, 7522NB Enschede, The Netherlands
When a drop is deposited on a hot surface there is a minimum temperature, the Leidenfrost temperature (TL), at which the drop levitates in its own vapor. The first detailed description of the phenomenon was given 300 years ago by the physicist J. G. Leidenfrost. Since then, a model describing the conditions at which this phenomenon happens has still to be addressed. Previous studies exhibited a linear relation between TL and Tsat (saturation temperature) for a group of hydrocarbons. A similar behavior between the two temperatures for a single liquid at different ambient pressure conditions was also observed. In the present study, the relation between both temperatures was explored.
The Leidenfrost temperature of different organic liquids and water at low and high pressures was obtained by observing the behavior of drops at different surface temperatures. As a first result, a linear relationship was found between TL and Tsat at low pressures for each liquid. For all liquids, these relation differs by a prefactor. From a dimensional analysis with phase transition variables, we defined the parameter L/CPv to nondimensionalize both temperatures. The collapse of the experimental data with this parameter, including high pressure measurements, reveals the universality of the Leidenfrost temperature.