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VOLUME 82 (2005) | ISSUE 4 | PAGE 207
Nonlinear Dynamics of Surface Dust Vortex and Dust Zonal Flow Systems
PACS: 52.27.Lw, 52.35.-q
Abstract
We present analytical and simulation studies of highly resolved dust fluid flows involving nonlinearly coupled incompressible surface dust vortex modes (SDVMs) and dust zonal flows (DZFs) in nonuniform unmagnetized dusty plasmas. For this purpose, we use the hydrodynamic equations for the dust fluid and Boltzmann distributed electrons and ions, and obtain a set of equations which exhibit nonlinear couplings between the SDVMs and DZFs. The nonlinear equations are then used to investigate the parametric excitation of DZFs by the Reynolds stresses of the SDVMs. Large scale SDVMs emerge through nonlinear interactions with DZFs, and they suppress the dust particle transport across the density gradient. By contrast, DZFs possess short scale vortices with a higher turbulent transport. The relevance of our investigation to the role of coherent structures in a nonuniform dusty plasma is discussed.