Delocalized heat flux for low Z plasmas

In local theory, the finite Z effect on electron heat conduction in plasmas is well established. We investigate that effect for nonlocal heat transport by solving the reduced Fokker-Planck equation for moderately low Z plasma. It is found that the classical Spitzer-Harm heat flux expression is recov...

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Bibliographic Details
Published in:Physics letters. A 1990-02, Vol.144 (3), p.164-168
Main Authors: Murtaza, G., Mirza, Arshad M., Qaisar, M.S.
Format: Article
Language:English
Subjects:
Exact sciences and technology
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
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Summary:In local theory, the finite Z effect on electron heat conduction in plasmas is well established. We investigate that effect for nonlocal heat transport by solving the reduced Fokker-Planck equation for moderately low Z plasma. It is found that the classical Spitzer-Harm heat flux expression is recovered along with the usual finite Z correction factor, in the gentle gradient limit. Similarly in the nonlocal case, the maximum heat flux expression is also multiplied by a finite Z correction factor which results in substantial reduction of heat flux. For typical parameters T h = 10 T c , n h =0.1 n c and Z=5, the free streaming heat flux value corresponds to a flux limiting factor ƒ≈0.07 in contrast with 0.21 of our previous nonlocal model.
ISSN:0375-9601
1873-2429
DOI:10.1016/0375-9601(90)90693-I