Vortex in a strongly coupled dusty plasma embedded in an external magnetic field

Abstract

Vortex motion of a dust fluid suspended in an argon rf power has been investigated for both the kinetic and hydrodynamic limit of a strongly coupled compressible dusty plasma below crystallization limit. Dust particles are confined by a radial weak electric field under the influence of a strong vertical magnetic field, dust-dust correlation, ion drag, particle attachment, grains drift, and diffusion. Radial distribution of different vortex properties is observed numerically. Modifications of those properties due to the variations in grain size and ion temperature are compared between hydrodynamic and kinetic limits and are found to be more prominent in the hydrodynamic regime. With the decreasing correlation among the grains, the range of radial distribution of dust particles expands and the influence of shear rotation increases. Moreover, vortex flow dissipation is found to be enhanced at a large rate in the case of hydrodynamic limit compared to the case of kinetic one.