Using 2D Molecular Dynamics simulation, the equilibrium and dynamical properties of a gravitationally equilibrated Yukawa liquid are investigated. We observe that due to asymmetry introduced in one direction by gravity, several interesting features arise. For example, for a given value of coupling parameter Γ, screening parameter κ, and according to a chosen value of gravitational force g (say in y-direction), the system is seen to exhibit super-, sub- or normal diffusion. Interestingly, x-averaged density profiles, unlike a barotropic fluid, acquires sharp, free surface with scale free linear y-dependence. As can be expected for a system with macroscopic gradients, self-diffusion calculated from Green-Kubo’s formalism does not agree with that obtained from Einstein-Smoluchowski diffusion. A 2D angular-radial pair correlation function g(r, θ) clearly indicates asymmetric features induced by gravity. We observe that due to compression in y-direction, though in liquid state for all values of gravity considered, the transverse mode is found to predominant as compared to the longitudinal mode, leading to a novel Anisotropic Solid-like Yukawa liquid.
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April 2014
Research Article|
April 03 2014
Properties of gravitationally equilibrated Yukawa systems—A molecular dynamics study
Harish Charan;
Harish Charan
Institute for Plasma Research, Bhat-Village
, Gujarat, Gandhinagar 382428, India
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Rajaraman Ganesh;
Rajaraman Ganesh
a)
Institute for Plasma Research, Bhat-Village
, Gujarat, Gandhinagar 382428, India
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Ashwin Joy
Ashwin Joy
Institute for Plasma Research, Bhat-Village
, Gujarat, Gandhinagar 382428, India
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Phys. Plasmas 21, 043702 (2014)
Article history
Received:
January 30 2014
Accepted:
March 19 2014
Citation
Harish Charan, Rajaraman Ganesh, Ashwin Joy; Properties of gravitationally equilibrated Yukawa systems—A molecular dynamics study. Phys. Plasmas 1 April 2014; 21 (4): 043702. https://doi.org/10.1063/1.4870081
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