Abstract
In this work, a one-dimensional numerical fluid model is developed for co-axial dielectric barrier discharge in pure helium and a parametric study is performed to systematically study the influence of relative permittivity of the dielectric barrier and the applied voltage amplitude and frequency on the discharge performance. Discharge current, gap voltage, and spatially averaged electron density profiles are presented as a function of relative permittivity and voltage parameters. For the geometry under consideration, both the applied voltage parameters are shown to increase the maximum amplitude of the discharge current peak up to a certain threshold value, above which it stabilized or decreased slowly. The spatially averaged electron density profiles follow a similar trend to the discharge current. Relative permittivity of the dielectric barrier is predicted to have a positive influence on the discharge current. At lower frequency, it is also shown to lead to a transition from Townsend to glow discharge mode. Spatially and time averaged power density is also calculated and is shown to increase with increasing relative permittivity, applied voltage amplitude, and frequency.
Highlights
In the last two decades, there has been a growing interest in using atmospheric non-thermal plasma in dielectric barrier discharge (DBD) as a chemical reactor for remediation of gaseous pollutants and greenhouse gases, at low temperature.[1,2] Typical applications include treatment of nitrogen oxides (NOx) and sulphur oxides (SOx) in flue gases and decomposition of CO2, CH4, volatile organic compounds (VOCs), chlorofluorocarbons (CFCs), and other hazardous air pollutants.[3,4,5,6] Operation of DBD, by application of an electric field between two electrodes separated by at least one dielectric layer, creates highly energetic electrons while maintaining the gas stream at close to room temperature
We have studied the influence of applied voltage amplitude and frequency over a wide range, along with the influence of relative permittivity of the dielectric barrier on the overall discharge performance in a co-axial DBD
We have studied the influence of relative permittivity of the dielectric barrier and applied voltage parameters using a numerical analysis
Summary
In the last two decades, there has been a growing interest in using atmospheric non-thermal plasma in dielectric barrier discharge (DBD) as a chemical reactor for remediation of gaseous pollutants and greenhouse gases, at low temperature.[1,2] Typical applications include treatment of nitrogen oxides (NOx) and sulphur oxides (SOx) in flue gases and decomposition of CO2, CH4, volatile organic compounds (VOCs), chlorofluorocarbons (CFCs), and other hazardous air pollutants.[3,4,5,6] Operation of DBD, by application of an electric field between two electrodes separated by at least one dielectric layer, creates highly energetic electrons while maintaining the gas stream at close to room temperature. The electrons due to their high energy may collide with the gaseous pollutants and start disintegrating them into smaller molecules, while simultaneously colliding with the background gases to generate a large number of highly reactive free radicals such as HÁ; OÁ; and OHÁ7 These free radicals initiate a number of additional reactions with the pollutants and intermediates, thereby speeding up the decomposition.[5] The non-equilibrium nature of such plasma discharge provides major advantage, by allowing operation at atmospheric pressure and ambient conditions Additional features such as easy operation, moderate capital cost, and simple scalability have led to extensive research on DBD for gas cleaning applications.[4].
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