Numerical studies of atmospheric pressure glow discharge controlled by a dielectric barrier between two coaxial electrodes
Zhang Hong-Yan(张红艳）, Wang De-Zhen(王德真)† , and Wang Xiao-Gang(王晓钢）
State Key Laboratory of Materials Modification by Laser, Electron, and Ion Beams, School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China
Abstract The glow discharge in pure helium at atmospheric pressure, controlled by a dielectric barrier between coaxial electrodes, is investigated based on a one-dimensional self-consistent fluid model. By solving the continuity equations for electrons, ions, and excited atoms, with the current conservation equation and the electric field profile, the time evolution of the discharge current, gas voltage and the surface density of charged particles on the dielectric barrier are calculated. The simulation results show that the peak values of the discharge current, gas voltage and electric field in the first half period are asymmetric to the second half. When the current reaches its positive or negative maximum, the electric field profile, and the electron and ion densities represent similar properties to the typical glow discharge at low pressures. Obviously there exist a cathode fall, a negative glow region, and a positive column. Effects of the barrier position in between the two coaxial electrodes and the discharge gap width on discharge current characteristics are also analysed. The result indicates that, in the case when the dielectric covering the outer electrode only, the gas is punctured earlier during the former half period and later during the latter half period than other cases, also the current peak value is higher, and the difference of pulse width between the two half periods is more obvious. On reducing the gap width, the multiple current pulse discharge happens.
Received: 30 May 2006
Revised: 20 October 2006
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of
China (Grant Nos 50537020 and 50528707).
Cite this article:
Zhang Hong-Yan(张红艳）, Wang De-Zhen(王德真), and Wang Xiao-Gang(王晓钢） Numerical studies of atmospheric pressure glow discharge controlled by a dielectric barrier between two coaxial electrodes 2007 Chinese Physics 16 1089
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
