Voids in plasmas containing interacting variable charge dust grains

2018 
A nonlinear model of void formation is proposed which includes the dust grain charge variation along with the grain–grain interaction and the effect of neutral density. It is found that the extension of the void decreases if the dust particulate charge is taken into account. Moreover, for larger dust grains, it is seen that the wave-like structure recedes when the charge variation is dealt with. Furthermore, as the grain–grain distance is inversely proportional to density, the grain–grain interaction becomes more important for a denser dust population and is to be included in the momentum equation. The grain–grain interaction affects the depth of the void and the secondary depletion rings. Finally, increasing the neutral density leads to widening of depletion rings and to the appearance of new ones.
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