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Shear flow in a three-dimensional complex plasma in microgravity conditions

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arxiv 2009.09707 v1 pith:PYWSORHK submitted 2020-09-21 physics.plasm-ph

V. Nosenko , M. Pustylnik , M. Rubin-Zuzic , A. M. Lipaev , A. V. Zobnin , A. D. Usachev , H. M. Thomas , M. H. Thoma
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V. E. Fortov O. Kononenko A. Ovchinin
This is my paper · ORCID
classification physics.plasm-ph
keywords complexflowplasmashearconditionsestimatemicrogravitythree-dimensional
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abstract

Shear flow in a three-dimensional complex plasma was experimentally studied in microgravity conditions using Plasmakristall-4 (PK-4) instrument on board the International Space Station (ISS). The shear flow was created in an extended suspension of microparticles by applying the radiation pressure force of the manipulation-laser beam. Individual particle trajectories in the flow were analyzed and from these, using the Navier-Stokes equation, an upper estimate of the complex plasma's kinematic viscosity was calculated in the range of $0.2$--$6.7~{\rm mm^2/s}$. This estimate is much lower than previously reported in ground-based experiments with 3D complex plasmas. Possible reasons of this difference are discussed.

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