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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

MODELING ON THE CHARACTERISTICS OF A DIRECT-CURRENT ARGON MICRO-DISCHARGE WITH THE CONSIDERATION OF THERMIONIC EISSION ON CATHODE SURFACE AT ATMOSPHERIC PRESSURE

Wen Zhou
Key Laboratory of Thermo Fluid Science and Engineering, Ministry of Education Xi’an Jiaotong University

Heng Guo
Department of Engineering Physics, Tsinghua University, Beijing 100084, P. R. China

Wei Jiang
School of Physics, Huazhong University of Science and Technology, Wuhan 430007, P. R. China

Heping Li
Department of Engineering Physics, Tsinghua University, Beijing 100084, P. R. China

Zengyao Li
Key Laboratory of Thermo-Fluid and Science and Engineering, Ministry of Education School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, P.R. China

Abstract

Direct-current micro-scale gas discharges have attracted much attention of the researchers due to the interesting plasma physics involved in the discharges and their bright aspects in different fields. In previous studies, the secondary electron emission and field emission processes have been studied by many authors, however, the thermionic emission with a heated electrode surface is scarcely investigated, which may influence the characteristics of the micro-discharge. In this paper, a one-dimensional implicit particle-in-cell Monte Carlo collision method is employed to study the kinetic behaviors of the direct-current micro-discharges using argon as the plasma forming gas at atmospheric pressure, in which the thermionic emission from the heated cathode is considered. The species number densities, breakdown voltage, the spatially averaged electron energy probability function and electric field with different electrode gap spacings are predicted, and the influences of the thermionic emission process on the features of the micro-discharges are revealed.

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