Simulation studies on the dependence of the low-temperature atmosphere pressure He/N2 DBD on gas temperature
When the gas temperature(ambient temperature)is below a certain value,water vapor,nitrogen,and oxygen will gradually liquefy with the decrease of the gas temperature.As a result,an atmospheric pressure helium dielectric barrier discharge(DBD)will display some unique physical characteristics.In this paper,a two-dimensional(2D)fluid model of the dielectric barrier discharge was established based on the COMSOL simulation software.The influences of the gas temperature on a low-temperature atmosphere pressure He/N2 DBD characteristics including electrical characteristics,discharge mode and discharge generation,development etc were re-searched.The simulation results show that:(1)With the decrease in the gas temperature,the discharge gradually transits from Townsend to glow discharge,and both the breakdown voltage and the electron density in the discharge column increase;The discharge column moves towards the radial center.(2)The discharges firstly occur near the instantaneous anode then develop towards the instan-taneous cathode under different gas temperatures.The discharge can develop to the instantaneous cathode,but the discharge at different radial positions does not occur simultaneously at lower gas temperature.The simulation results can help deepen understanding of atmos-pheric pressure DBD discharge knowledge,and increase the control parameter of atmospheric pressure DBD plasma.
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