Kiel 2004 – wissenschaftliches Programm

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P: Plasmaphysik

P 10: Postersitzung: Niedertemperaturplasmen Plasmatechnologie II, Staubige Plasmen II, Magnetischer Einschluss II

P 10.33: Poster

Dienstag, 9. März 2004, 17:45–19:30, Foyer

The effect of micro-roughness on the flow-behaviour of fluids — •Martin A. Fink, Uwe Konopka, and Gregor E. Morfill — Centre for Interdisciplinary Plasma Science, Max Planck Institute for extraterrestrial Physics, Giessenbachstrasse, D-85741 Garching

The flow-behaviour of fluids at their borders strongly depends on their surface characteristics. Micro-roughness seems to play a decisive role. In the experiments presented here, we want to study this influence on a kinematic, microscopic level. In doing so we will investigate the transition from laminar to turbulent flow for several well-known levels of micro-roughness. To do this, the fluid should be analyzed on scales of the order of single effective particle diameters. With traditional fluids measurements of this type are impossible, as the detection of particle-movement at atomic scales cannot be carried out. A way out of this experimental constraint has been developed recently, using complex plasmas. Depending on the chosen parameters, such plasmas can be either in the fluid state (weakly coupled) or in a crystaline state (strongly coupled). In the fluid phase the charged micro- particles represent the ”atoms” of the fluid, and since they can be individually visualised, we are able to observe the flow at a quasi atomic scale. Experimental setup as well as first results are presented here.