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Can produce a large area of ??non-thermal equilibrium plasma , dielectric barrier discharge (DBD) has a good prospect in terms of material surface treatment , biological sterilization , pollution control , become hot research scholars in recent years . This study used a different specification stainless steel mesh to achieve space periodic boundary conditions change , the screen size , voltage , frequency , pressure on the discharge of the impact , and screen- assisted gas-liquid two-phase body DBD indigo simulation wastewater treatment . Experiment found that when the mesh size is greater than 250μm , the micro-discharge along Mesh rules distribution randomly distributed micro-discharge , when the mesh size is less than 200μm . With the voltage and the frequency increases , the discharge becomes strong; With the decrease in the air pressure , the initial discharge voltage is reduced , discharge appearance becomes diffuse . Observed in argon , 0.25Mpa obvious main peak phenomenon , according to the discharge photos and current waveforms speculated that the region of the center of the electrode , the electric field is relatively uniform , belonging to the glow discharge , the formation of the current main peak ; around the electrode due to field strength aberrations , the occurrence of filamentous discharge superimposed a small peak in the current main peak . The mesh electrode structure , the current waveform obvious polarity effect . The analysis showed that the discharge strength so that the voltage of plus or minus half weeks due to a non - symmetrical electrode structure is different , and thus the current waveform is different . Article in the case of different frequency and voltage waveform of the current through each electrode structure analysis, found that with increasing voltage and frequency , polarity effect weakened . Analysis of the wall charge , space charge and corona discharge polarity effect . DBD simulation model for the experimental device to study the mechanism of generating the polarity effect that the wall charge , space charge and corona voltage of plus or minus half cycle so that the conductivity of the gas gap , equivalent to the resistance of the simulation model . different simulation consistent results with measured data . By screen - assisted DBD water treatment experimental study , found that the The silkscreen added distribution to the discharge rules , when the screen density is less than 5 mm , discharge becomes random . Indigo wastewater treatment using the experimental apparatus , and found that the discharge for two minutes treatment effect is most obvious . This provides a new approach to using a dielectric barrier discharge for industrial wastewater treatment ; its special two-phase form , can also be used for exhaust gas treatment .
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