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P: Fachverband Plasmaphysik

P 8: Complex Plasmas and Dusty Plasmas I

P 8.3: Vortrag

Dienstag, 27. Februar 2024, 11:45–12:00, WW 1: HS

Three-dimensional investigation of dust flows around obstacles under microgravity — •Stefan Schütt, Christina Knapek, Daniel Maier, Daniel Mohr, and André Melzer — University of Greifswald, Greifswald, Germany

Dust flows around a tungsten wire in three-dimensionally extended dusty plasmas have been investigated on parabolic flights. A fixed wire has been installed in the midplane between the electrodes of a parallel plate rf discharge. The dust particles were captured three-dimensionally with a stereoscopic four-camera system. The dust flow around the wire was investigated during the pull-out phase at the end of each parabola, when gravity sets in and the dust cloud moves downward past the wire. Additionally, a periodic dust motion was generated by superimposing a low-frequency (f≈ 1 Hz) modulation on the electrodes. The repetitive nature of the dust motion in the latter case allows to stroboscopically overlay dust trajectories from multiple modulation periods and to accurately obtain fluid properties in three dimensions.

This work was supported by DLR grants 50WM1962 and 50WM2161.

Keywords: dusty plasmas; complex plasmas; dust flow; parabolic flights