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Resistive convection in a current‐carrying cylindrical plasma: An exact model

 

作者: L. Gomberoff,  

 

期刊: Physics of Fluids B: Plasma Physics  (AIP Available online 1989)
卷期: Volume 1, issue 10  

页码: 2126-2128

 

ISSN:0899-8221

 

年代: 1989

 

DOI:10.1063/1.859077

 

出版商: AIP

 

数据来源: AIP

 

摘要:

In a previous paper [J. Plasma Phys.34, 299 (1985)] it was shown that resistivity and thermal conductivity lead to large scale stationary convection in a current‐carrying cylindrical plasma under the action of a shearless magnetic field. It was shown there that convection takes place when (&eegr;/&kgr;)=8&pgr;/3, where &eegr; is the resistivity and &kgr; the thermal conductivity. Convection occurs when either (B&thgr;/Bz) ≫1 or when (B&thgr;/Bz)≪1. In both cases the condition for convection, i.e.,R>Rcrit, whereRis the Rayleigh number, was shown to be the same. From this fact it was then conjectured that convection takes place for anyB&thgr;/Bz. By solving the model in a closed form, it is shown that the conjecture is correct for large azimuthal wavenumbers, but, otherwise, convection takes place only in the limits mentioned above.

 

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