Electron parallel closures for arbitrary collisionality

Journal Article · Mon Dec 15 00:00:00 EST 2014 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4904906· OSTI ID:22403330

Ji, Jeong-Young; Held, Eric D. ^[1]

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1. Department of Physics, Utah State University, Logan, Utah 84322 (United States)

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.

• OSTI ID: 22403330
• Journal Information: Physics of Plasmas, Vol. 21, Issue 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CLOSURES
ELECTRONS
HEAT FLUX
IONS
KERNELS
TEMPERATURE GRADIENTS
VELOCITY