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Title: Viscosity of confined two-dimensional Yukawa liquids: A nonequilibrium method

We present a nonequilibrium method that allows one to determine the viscosity of two-dimensional dust clusters in an isotropic confinement. By applying a tangential external force to the outer parts of the cluster (e.g., with lasers), a sheared velocity profile is created. The decay of the angular velocity towards the center of the confinement potential is determined by a balance between internal (viscosity) and external friction (neutral gas damping). The viscosity can then be calculated from a fit of the measured velocity profile to a solution of the Navier-Stokes equation. Langevin dynamics simulations are used to demonstrate the feasibility of the method. We find good agreement of the measured viscosity with previous results for macroscopic Yukawa plasmas.
Authors:
 [1] ; ; ;  [2]
  1. Universität Leipzig, Institut für Theoretische Physik, Brüderstr. 16, 04103 Leipzig (Germany)
  2. Christian-Albrechts-Universität zu Kiel, Institut für Theoretische Physik und Astrophysik, Leibnizstr. 15, 24098 Kiel (Germany)
Publication Date:
OSTI Identifier:
22493791
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANGULAR VELOCITY; CONFINEMENT; LANGEVIN EQUATION; LASERS; MATHEMATICAL SOLUTIONS; NAVIER-STOKES EQUATIONS; SHEAR; TWO-DIMENSIONAL SYSTEMS; VISCOSITY; YUKAWA POTENTIAL