Regensburg 2010 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 32: Fluid Dynamics
DY 32.3: Talk
Friday, March 26, 2010, 10:45–11:00, H47
Characteristics of water jet reflection on superhydrophobic surfaces in experiment and theory — •Sören Kaps1, Rainer Adelung1, Srdjan Milenkovic2, and Achim Walter Hassel2 — 1Functional Nanomaterials, Technical Faculty, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany — 2Institute for Chemical Technology of Inorganic Materials, Johannes Kepler University, Altenbergerstr. 69, 4040 Linz, Austria
After impinging onto superhydrophobic surfaces water jets are observed to flow along for a distance equal to several jet diameters before they are jumping off the surface under an angle that is close to or smaller than the angle of incidence. To understand this effect the reflection of water jets on different surfaces with varying jet parameters was investigated. The reflection mechanism can be described by a mathematical model which assumes the total energy of the system as constant. The speed of the conversion of kinetic energy to surface energy and vice versa can be calculated for different wetting condition parameters. Parameters included in this theory are the surface roughness, interfacial energies as well as diameter, speed, and angle of the incident water jet. Variation of these parameters shows how the characteristics of the reflection changes and where the limits of water jet reflection are.