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A numerical study of gravity-driven instability in strongly coupled dusty plasma. Part 2. Hetero-interactions between a rising bubble and a falling droplet

Published online by Cambridge University Press:  09 July 2021

Vikram S. Dharodi Open the ORCID record for Vikram S. Dharodi [Opens in a new window]
Vikram S. Dharodi*
Affiliation:
Mechanical Engineering, Michigan State University, East Lansing, MI48824, USA
*
†Email address for correspondence: [email protected]
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Abstract

In part 1 (V. S. Dharodi and A. Das, J. Plasma Phys. 87 (02), 905870216 (2021)), we simulated the individual dynamics of a bubble (a localized low-density region) and a droplet (a localized high-density region) in a strongly coupled dusty plasma. We observed that under the influence of gravity, the result of a pair of counter-rotating vorticity lobes causes the bubble to rise and droplet to fall. With an interest to understand the hetero- (bubble–droplet) interactions between them, we extend this study to their combined evolution through the following two arrangements. First, both are placed side-by-side in a row at the same height. We observe that the overall dynamics is governed by the competition between the net vertical motion induced by gravity and rotational motion induced by the pairing between two co-rotating inner vorticity lobes. In the second arrangement, the vertically aligned bubble (below) and droplet (above) after collision exchange their partners and subsequently start to move horizontally in opposite directions away from each other. This horizontal movement becomes slower with increasing coupling strength. For these arrangements, we consider varying the distance between the fixed-size bubble and droplet, and varying the coupling strength. To visualize the bubble–droplet interactions, a series of two-dimensional simulations have been conducted in the framework of an incompressible generalized hydrodynamic viscoelastic fluid model.

Keywords

dusty plasmasstrongly coupled plasmascomplex plasmas
Type
Research Article
Information
Journal of Plasma Physics , Volume 87 , Issue 4 , August 2021 , 905870402
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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Footnotes

‡

Present address: Institute for Plasma Research, HBNI, Bhat, Gandhinagar 382 428, India.

References

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