Article

Investigation of the Atmospheric Helium Dielectric Barrier Discharge Driven by a Realistic Distorted-Sinusoidal Voltage Power Source

Plasma Chemistry and Plasma Processing (Impact Factor: 1.73). 01/2011; 31(1):1-21. DOI: 10.1007/s11090-010-9275-y

ABSTRACT The non-equilibrium atmospheric-pressure parallel-plate helium dielectric barrier discharge (DBD) driven by a realistic 20kHz
distorted-sinusoidal voltage waveform has been investigated by means of simulations and experiments. A self-consistent one-dimensional
fluid modeling code considering the non-local electron energy balance was applied to simulate the helium DBD. The effect of
selecting plasma chemistry was investigated by comparing simulations with experiments. The results show that the simulations,
which include more excited helium, metastable helium and electron–ion-related reaction channels, can faithfully reproduce
the measured discharged temporal current quantitatively. Based on the simulated discharge properties, we have found that there
is complicated mode transition of discharges from the long Townsend-like to the “dark current”-like, then to the short primary
Townsend-like and the short secondary Townsend-like for the helium DBD that is driven by a realistic distorted-sinusoidal
voltage power source. Discharge properties in different periods of discharge are discussed in detail in the paper.

KeywordsTownsend-like discharge–Atmospheric pressure plasmas–Helium–Fluid modelling–Dielectric barrier discharge

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    ABSTRACT: In this paper, a planar atmospheric-pressure dielectric barrier discharge (AP-DBD) of nitrogen mixed with ammonia (0textendash2 %) is simulated using one-dimensional self-consistent fluid modeling with cell-centered finite-volume method. This AP-DBD is driven by a 30 kHz power source with distorted sinusoidal voltages. The simulated discharge current densities are found to be in good agreement with the experiment data in both phase and magnitude. The simulated results show that the discharges of N 2 mixed with NH 3 (0textendash2 %) are all typical Townsend-like discharges because the ions always outnumber the electrons very much which leads to no quasi-neutral region in the gap throughout the cycle. N 2 + and N 4 + are found to be the most abundant charged species during and after the breakdown process, respectively, like a pure nitrogen DBD. NH 4 + increases rapidly initially with increasing addition of NH 3 and levels off eventually. In addition, N is the most dominant neutral species, except the background species, N 2 and NH 3 , and NH 2 and H are the second dominant species, which increase with increasing added NH 3 . The existence of abundant NH 2 plays an important role in those applications which require functional group incorporation.
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