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多孔介质期刊
影响因子: 1.49 5年影响因子: 1.159 SJR: 0.504 SNIP: 0.671 CiteScore™: 1.58

ISSN 打印: 1091-028X
ISSN 在线: 1934-0508

多孔介质期刊

DOI: 10.1615/JPorMedia.v16.i8.30
pages 709-724

EFFECT OF POROSITY AND FLR CORRECTIONS ON JEANS INSTABILITY OF SELF-GRAVITATING RADIATIVE THERMALLY CONDUCTING VISCOUS PLASMA

Sachin Kaothekar
Department of Engineering Physics, Mahakal Institute of Technology, Ujjain (M. P.) 456664, India
Rajendra K. Chhajlani
School of Studies in Physics, Vikram University Ujjain (M.P.)-456010, India

ABSTRACT

The effects of porosity, radiative heat-loss function, and finite ion Larmor radius (FLR) corrections on the selfgravitational instability of infinite homogeneous viscous plasma have been investigated incorporating the effects of thermal conductivity, finite electrical resistivity, and permeability. A general dispersion relation is derived using the normal mode analysis method with the help of relevant linearized perturbation equations of the problem. The wave propagation along and perpendicular to the direction of magnetic field has been discussed. The condition of stability of the medium is discussed by applying the Routh-Hurwitz criterion. We find that the presence of porosity, FLR corrections, radiative heat-loss function, and thermal conductivity modifies the fundamental Jeans criterion of gravitational instability. Analytical and numerical calculations are carried out to show the effect of various physical parameters on the growth rate of the self-gravitational instability. From the curves we find that temperature dependent heat-loss function, medium porosity, and FLR corrections have a stabilizing effect, while density dependent heat-loss function has a destabilizing effect on the growth rate of self-gravitational instability in the present medium.


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