All Physics Faculty Publications

Document Type

Article

Journal/Book Title/Conference

Physics of Plasma

Volume

21

Publisher

AIP Publishing

Publication Date

12-23-2014

DOI

10.1063/1.4904906

Abstract

Electron parallel closures for heat flow, viscosity, and friction force are expressed as kernel-weighted integrals of thermodynamic drives, the temperature gradient, relative electron-ion flow velocity, and flow-velocity gradient. Simple, fitted kernel functions are obtained for arbitrary collisionality from the 6400 moment solution and the asymptotic behavior in the collisionless limit. The fitted kernels circumvent having to solve higher order moment equations in order to close the electron fluid equations. For this reason, the electron parallel closures provide a useful and general tool for theoretical and computational models of astrophysical and laboratory plasmas.

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