2019-11-13T00:29:14Z
http://oa.upm.es/cgi/oai2
oai:oa.upm.es:21553
2016-04-21T12:12:23Z
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Self-consistent, nonlocal electron heat flux at arbitrary ion charge number
Sanmartín Losada, Juan Ramón
Ramírez, J.
Fernández-Feria, Rafael
Minotti, F.
Aeronautics
Physics
A single, nonlocal expression for the electron heat flux, which closely reproduces known results at high and low ion charge number 2, and “exact” results for the local limit at all 2, is derived by solving the kinetic equation in a narrow, tail-energy range. The solution involves asymptotic expansions of Bessel functions of large argument, and (Z-dependent)order above or below it, corresponding to the possible parabolic or hyperbolic character of the kinetic equation; velocity space diffusion in self-scattering is treated similarly to isotropic thermalization of tail energies in large Z analyses. The scale length H characterizing nonlocal effects varies with Z, suggesting an equal dependence of any ad hoc flux limiter. The model is valid for all H above the mean-free path for thermal electrons.
E.T.S.I. Aeronáuticos (UPM)
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
1992
info:eu-repo/semantics/article
Article
Physics of fluids B, ISSN 0899-8221, 1992, Vol. 4, No. 11
NonPeerReviewed
application/pdf
eng
info:eu-repo/semantics/openAccess
http://oa.upm.es/21553/