Modeling low pressure collisional plasma sheath with space-charge effect

Physics of Plasmas - Tập 10 Số 6 - Trang 2578-2585 - 2003
Subrata Roy1, B. P. Pandey1, Jonathan Poggie2, Datta V. Gaitonde2
1Computational Plasma Dynamics Laboratory, Mechanical Engineering, Kettering University, Flint, Michigan 48532-4898
2Computational Sciences Branch, Air Vehicles Directorate, Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433

Tóm tắt

The present work develops a computationally efficient one-dimensional subgrid embedded finite element formulation for plasma-sheath dynamics. The model incorporates space-charge effect throughout the whole plasma and the sheath region using multifluid equations. Secondary electron emission is not considered. A third-order temperature dependent polynomial is used to self-consistently calculate the rate of ionization in the plasma dynamic equations. The applications include dc and rf sheath inside a glow discharge tube where the noble gas is immobile, and a partially ionized plasma sheath inside an electric propulsion thruster channel in which the gas flows. The electron and ion number densities of the numerical solution decrease in the sheath region as expected. The ion velocity and electron temperature profiles also exhibit the expected behavior. The computed sheath potential compares well with the available experimental data.

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Thông tin
Thông tin xuất bản

Physics of Plasmas

Tập 10 Số 6

2578-2585

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