Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

DY: Fachverband Dynamik und Statistische Physik

DY 25: Fluid dynamics II

DY 25.2: Vortrag

Donnerstag, 26. März 2009, 15:00–15:15, ZEU 118

Energetic consideration of the reflection of water jets on superhydrophobic surfaces — •Sören Kaps¹, Michael Scharnberg² und Rainer Adelung¹ — ¹Functional Nanomaterials, Technical Faculty, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany — ²Chair for Multicomponent Materials, Technical Faculty, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany

After impinging onto biological and artificial superhydrophobic surfaces water jets are observed to flow across the surface for a distance equal to several jet diameters before they are reflected off the surface as coherent jets under an angle that is close to or smaller than the angle of incidence. To understand the mechanisms of water jet reflection the conversion of surface energy to kinetic energy and vice versa is considered. A simple model based on these energetic considerations was derived to fit the experimental data. The geometry of the water surface is a critical parameter in this model. Different approaches to this geometry will be discussed.