Bremen 2017 – scientific programme

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P: Fachverband Plasmaphysik

P 7: Complex and Dusty Plasmas

P 7.10: Poster

Monday, March 13, 2017, 16:30–18:30, HS Foyer

(In-)Compressibility of crystalline particle flows — •Jochen Wilms and Alexander Piel — Institute of Experimental and Applied Physics, Kiel University, Germany

Dust trapping of free-floating torus-shaped dust clouds in magnetized anodic plasmas has been studied extensively over the past few years. In an upright, ring-shaped confinement the particles are driven in azimuthal direction by the Hall component of the ion drag.[1] Because of acceleration and deceleration due to gravity a stationary but inhomogeneous flow pattern establishes. This flow shows many interesting properties, e.g., we observed shock-like phenomena, a crystallization of the flow, bifurcations and inverse bifurcations.[2] The laboratory experiments are accompanied by detailed 3D molecular-dynamics simulations which make measures accessible, which are beyond the possibilities of the real experiment. Recent results of these numerical experiments have shown that a toroidal dust flow in the incompressible fluid limit can evolve shock-like events which are similar to hydraulic jumps in open channel flows.[3] In this contribution we will discuss the hydrodynamics and the thermodynamics of flow properties and the hydraulic jump at the individual particle scale. Furthermore, we will examine on the microscopic level how a compressible medium like a dust cloud can act quasi-incompressible.

Funded by DFG in the framework of SFB-TR24, Project A2.

[1] I. Pilch et al., Physics of Plasmas 15, 103706 (2008)

[2] J.Wilms et al., Physics of Plasmas 22, 063701 (2015)

[3] A. Piel and J. Wilms, Physics of Plasmas 23, 073701 (2016)