期刊
PHYSICA SCRIPTA
卷 97, 期 6, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1402-4896/ac6d87
关键词
Dusty plasmas; velocity shear; Ion drag force; polarization force; instabilities; normal mode method
资金
- Indian Space Research Organisation (ISRO) Bangaluru under ISRO-RESPOND scheme [ISRO/RES/2/427/21-22]
- Inter-University Center for Astronomy and Astrophysics (IUCAA), Pune (India)
This study investigates the velocity shear driven Kelvin-Helmholtz (K-H) instability in an incompressible subsonic sheared dusty plasma. The results show that the simultaneous presence of ion drag and dust polarization forces excites the K-H instability, which is completely suppressed in the absence of these forces. The magnitude of the shear velocity increase and the dust polarization interaction parameter enhance the growth rate of the instability.
Velocity shear driven Kelvin-Helmholtz (K-H) instability has been investigated in an incompressible subsonic sheared dusty plasma with ion drag and dust polarization forces. A three-component dusty fluid model has been formulated in connection with thermal electrons, inertial ions and charged dust grains. Dispersion relation of K-H instability along with dust-ion two-stream instability has been analyzed for a typical astrophysical dusty plasma environment. The magnitude of the polarization force is found to be small compared to the other forces, although it significantly modifies the K-H modes. The simultaneous presence of ion drag and dust polarization forces excites the K-H instability, which in the absence of these forces, is completely suppressed. It is also observed that the dust polarization interaction parameter and the magnitude of the shear velocity increase the growth rate of the K-H instability. The present results can have significant relevance in understanding the development of velocity shear driven K-H instability in some molecular outflows [1], Saturn's rings [2] etc.
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