Abstract
In this study, experimental results presenting the development of Dielectric Barrier Discharge (DBD) powered by bipolar and unipolar pulses are compared. The experimental results showed that discharge current peaks in the case of DBD driven by repetitive unipolar pulses were about three times lower than those in the case of DBD driven by bipolar pulses. It is well known that if DBD is driven by bipolar pulses, the effect of surface charge on dielectric layers from the preceding discharge helps to ignite consecutive discharges at the same locations where the previous discharges already struck. In contrast, in the case of DBD generated by using the low-frequency unipolar pulses, the consecutive DBDs just could be initiated after the system erases part of the prehistory effect of surface charge deposition on dielectric layers from the preceding discharge, and then the following discharge was ignited at erased or uncharged areas. It was critical that a part of the energy stored in the dielectric layer and discharge gap by the previous discharge needed to be released to develop the next discharge. The results of this study provided an outlook for estimating the effectiveness of the DBD plasma system used in specific applications such as DBD for flow actuators or surface treatment where the use of unipolar DBDs at low frequency may be necessary.
Highlights
Dielectric barrier discharge (DBD) plasma has drawn much attention due to the advantage of the existence of free radicals and high energy electrons at low gas temperature and atmospheric pressure.1–4 From the first application of being used for generating ozone,1,5 nowadays, the application of Dielectric Barrier Discharge (DBD) plasmas has opened up to various fields such as light sources,1,4 surface treatment,1,4 environmental treatments,6 water treatment,7,8 and medical treatment.9,10The DBD is a discharge type generated in a space gap between electrodes in the presence of one or more dielectric layers
A view of the equipment setup and a schematic of the electric circuit of DBD plasma generation and condition in both cases of DBD generating by using unipolar pulses and bipolar pulses are shown in Fig. 4 and Table I, respectively
Typical waveforms of voltages on the charge capacitor (1.25 nF), voltages on the series connection of silicone diodes for alternating current (SIDAC), voltages on the DBD reactor, currents flow through the DBD reactor, powers as products of the voltage multiplied to the current, and intensity of light emitted from the plasma are illustrated
Summary
Dielectric barrier discharge (DBD) plasma has drawn much attention due to the advantage of the existence of free radicals and high energy electrons at low gas temperature and atmospheric pressure. From the first application of being used for generating ozone, nowadays, the application of DBD plasmas has opened up to various fields such as light sources, surface treatment, environmental treatments (e.g., toxic gas decomposition), water treatment, and medical treatment.9,10The DBD is a discharge type generated in a space gap between electrodes in the presence of one or more dielectric layers. The accumulation of charges on the dielectric layer induces the effects called “memory effects” and an electric field in discharge space. For the case of DBD excited by high-frequency repetitive pulse with very short rise time, the “memory effect” from the primary discharge at a rising slope of high voltage pulse will initiate a secondary scitation.org/journal/adv discharge at a falling slope of the pulse. It seems that the secondary discharge developed along the conductive channel of the primary discharges.
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