Time-dependent one-dimensional simulation of atmospheric dielectric barrier discharge in N2/O2/H2O using COMSOL Multiphysics

F Sohbatzadeh,H Soltani

doi:10.1007/s40094-018-0281-4

F Sohbatzadeh, H Soltani

Open Access

https://doi.org/10.1007/s40094-018-0281-4

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Abstract

The results of time-dependent one-dimensional modelling of a dielectric barrier discharge (DBD) in a nitrogen–oxygen–water vapor mixture at atmospheric pressure are presented. The voltage–current characteristics curves and the production of active species are studied. The discharge is driven by a sinusoidal alternating high voltage–power supply at 30 kV with frequency of 27 kHz. The electrodes and the dielectric are assumed to be copper and quartz, respectively. The current discharge consists of an electrical breakdown that occurs in each half-period. A detailed description of the electron attachment and detachment processes, surface charge accumulation, charged species recombination, conversion of negative and positive ions, ion production and losses, excitations and dissociations of molecules are taken into account. Time-dependent one-dimensional electron density, electric field, electric potential, electron temperature, densities of reactive oxygen species (ROS) and reactive nitrogen species (RNS) such as: O, O−, O+, {text{O}}_{2}^{ - } , {text{O}}_{2}^{ + } , O3, {text{N}}, {text{N}}_{2}^{ + } , N2s and {text{N}}_{2}^{ - } are simulated versus time across the gas gap. The results of this work could be used in plasma-based pollutant degradation devices.

Highlights

Identifying and studying the plasma and active species characteristics have attracted much attention because of successful experimental studies on atmospheric pressure plasma applications such as processing technology, engineering [1], sterilization and surface treatment [2,3,4,5,6]
Pan et al used the fluid model to carry out numerically the evolution features of the atmospheric-pressure CF4 plasma in a dielectric barrier discharge [8]
Time-dependent one-dimensional electric field, electron density and temperature, densities of reactive oxygen and nitrogen species such as: O, O, O?, OÀ2, Oþ2, O3, N; Nþ2, N2s and NÀ2, were evaluated versus time across the gas gap. It is well-known that the initiated reactions by reactive oxygen species (ROS) and reactive nitrogen species (RNS) play the key role in plasma disinfection and surface processing

Summary

Introduction

Identifying and studying the plasma and active species characteristics have attracted much attention because of successful experimental studies on atmospheric pressure plasma applications such as processing technology, engineering [1], sterilization and surface treatment [2,3,4,5,6]. Gadkari et al modeled a co-axial DBD plasma reactor in pure helium using a 2-D fluid model in COMSOL Multiphysics [7]. They investigated the influence of partial packing on the discharge characteristics of the dielectric barrier discharge in helium. Time-dependent one-dimensional electric field, electron density and temperature, densities of reactive oxygen and nitrogen species such as: O, O-, O?, OÀ2 , Oþ2 , O3, N; Nþ2 , N2s and NÀ2 , were evaluated versus time across the gas gap It is well-known that the initiated reactions by reactive oxygen species (ROS) and reactive nitrogen species (RNS) play the key role in plasma disinfection and surface processing. The results of this work could be used in plasma-based pollutant degradation devices

Simulation model Geometry description

Equations for performing DBD simulations

Simulation results

Conclusions

Sticking coefficient