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On the evolution and formation of discharge morphology in pulsed dielectric barrier discharge

Plasma Science and Technology 2024年第4期26卷 101-113页

作者：陈星宇李孟琦王威逸张权治彭涛熊紫兰 State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China School of Physics Dalian University of TechnologyDalian 116024People’s Republic of China Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China

The discharge morphology of pulsed dielectric barrier discharge(PDBD) plays important roles in its applications. Here, we systematically investigated the effects of the voltage amplitude,discharge gap, and O_(2)content on the PDBD morphology, and revealed the possible underlying mechanism of the U-shaped formation. First, the morphological evolution under different conditions was recorded. A unique U-shaped region appears in the middle edge region when the gap is larger than 2 mm, while the entire discharge region remains columnar under a 2 mm gap in He PDBD. The width of the discharge and the U-shaped region increase with the increase in voltage, and decrease with the increase of the gap and O_(2)content. To explain this phenomenon,a two-dimensional symmetric model was developed to simulate the spatiotemporal evolution of different species and calculate the electric thrust. The discharge morphology evolution directly corresponds to the excited-state atomic reduction process. The electric thrust on the charged particles mainly determines the reaction region and strongly influences the U-shaped formation.When the gap is less than 2 mm, the electric thrust is homogeneous throughout the entire region,resulting in a columnar shape. However, when the gap is larger than 2 mm or O_(2)is added, the electric thrust in the edge region becomes greater than that in the middle, leading to the U-shaped formation. Furthermore, in He PDBD, the charged particles generating electric thrust are mainly electrons and helium ions, while in He/O_(2)PDBD those that generate electric thrust at the outer edge of the electrode surface are mainly various oxygen-containing ions.

关键词： low-temperature plasma dielectric barrier discharge discharge morphology particle distribution electric thrust

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Single flow treatment degradation of antibiotics in water using falling-film dielectric barrier discharge

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Plasma Science and Technology 2024年第4期26卷 27-36页

作者：许志远章程伍云健黄邦斗席登科张晓星邵涛 Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment Hubei University of TechnologyWuhan 430068People’s Republic of China Beijing International S&T Cooperation Base for Plasma Science and Energy Conversion Institute of Electrical EngineeringChinese Academy of SciencesBeijing 100190People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China

The environmental contamination caused by antibiotics is increasingly conspicuous due to their widespread manufacture and misuse. Plasma has been employed in recent years for the remediation of antibiotic pollution in the environment. In this work, a falling-film dielectric barrier discharge was used to degrade the antibiotic tetracycline(TC) in water. The reactor combined the gas-liquid discharge and active gas bubbling to improve the TC degradation performance. The discharge characteristics, chemical species’ concentration, and degradation rates at different parameters were systematically studied. Under the optimized conditions(working gas was pure oxygen, liquid flow rate was 100 mL/min, gas flow rate was 1 L/min,voltage was 20 kV, single treatment), TC was removed beyond 70% in a single flow treatment with an energy efficiency of 145 mg/(kW·h). The reactor design facilitated gas and liquid flow in the plasma area to produce more ozone in bubbles after a single flow under pure oxygen conditions, affording fast TC degradation. Furthermore, long-term stationary experiment indicated that long-lived active species can sustain the degradation of TC. Compared with other plasma treatment systems, this work offers a fast and efficient degradation method, showing significant potential in practical industrial applications.

关键词： antibiotic degradation dielectric barrier discharge reactive species single flow treatment

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Reconfigurable(4, 6^(2)) and(4, 8^(2)) Archimedean plasma photonic crystals in dielectric barrier discharge

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Plasma Science and Technology 2024年第6期26卷 70-78页

作者：李蕊王启晗刘富成高匡雅侯笑含贾萌萌李庆范伟丽 College of Physics Science and Technology Hebei UniversityBaoding 071002People’s Republic of China Institute of Electrostatic Technology Hebei UniversityBaoding 071002People’s Republic of China

Archimedean photonic crystal has become a research area of great interest due to its various unique properties. Here, we experimentally demonstrate the realization of reconfigurable(4, 6^(2))and(4, 8^(2)) Archimedean plasma photonic crystals(APPCs) by use of dielectric barrier discharges in air. Dynamical control on both the macrostructures including the lattice symmetry and the crystal orientation, and the microstructures including the fine structures of scattering elements has been achieved. The formation mechanisms of APPCs are studied by time-resolved measurements together with numerical simulations. Large omnidirectional band gaps of APPCs have been obtained. The tunable topology of APPCs may offer new opportunities for fabricating multi-functional and highly-integrated microwave devices.

关键词： Archimedean lattice plasma photonic crystals dielectric barrier discharge

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Recent developments in thermal characteristics of surface dielectric barrier discharge plasma actuators driven by sinusoidal high-voltage power

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Chinese Journal of Aeronautics 2023年第1期36卷 1-21页

作者： Xin ZHANG Yugang ZHAO Chun YANG State Key Laboratory of Aerodynamics China Aerodynamics Research and Development CenterMianyang 621000China School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore 639798Singapore

Flow control using surface dielectric barrier discharge(DBD)plasma actuators driven by a sinusoidal alternating-current power supply has gained significant attention from the aeronautic industry.The induced flow field of the plasma actuator,with the starting vortex in the wall jet,plays an important role in flow control.However,the energy consumed for producing the induced flow field is only a small fraction of the total energy utilized by the plasma actuator,and most of the total energy is used in gas heating and dielectric heating.Therefore,an in-depth analysis of the thermal characteristics of the plasma actuator is the key to develop its potential capability further.In addition,compared with the investigation on the aerodynamic characteristics of the plasma actuator,there is a relative lack of detail in the study of its thermal characteristics.Understanding the thermal characteristics of the plasma actuator is of great interest for providing a deeper insight into the underlying working principles,advancing its numerical simulation model,prolonging its life,and achieving several potential engineering applications,such as antiicing and deicing.The present paper reviews the thermal characteristics of the plasma actuator,summarizes the influence of the dielectric film and actuation parameters on heating,and discusses the formation and transfer mechanism of the induced heating based on the discharge regimes of the plasma actuator in one cycle.

关键词： dielectric barrier discharge Flow control Heat transfer Plasma actuator Thermal characteristics

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1d3v PIC/MCC simulation of dielectric barrier discharge dynamics in hydrogen sulfide

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Plasma Science and Technology 2022年第2期24卷 62-72页

作者：张婧叶书荣刘天旭孙安邦 State Key Laboratory of Safety and Control for Chemicals SINOPEC Research Institute of Safety Engineering Co.Ltd.Qingdao 266071People's Republic of China State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical EngineeringXi'an Jiaotong UniversityXi'an 710049People's Republic of China

In this study,we computationally examined the dynamics of dielectric barrier discharge in hydrogen sulfide.The simulations were performed with a 1 d3 v particle-in-cell/Monte Carlo collision model in which a parallel-plate electrode geometry with dielectrics was used.Particle recombination process is represented in the model.The discharge mode was found to be initially Townsend discharge developing from the cathode to the anode,and at the peak of the current,a more stable glow discharge develops from the anode to the cathode.A higher applied voltage results in sufficient secondary electrons to trigger a second current peak,and then the current amplitude increases.As the frequency is increased,it leads to the advance of the phase and an increase in the amplitude of the current peak.A higher dielectric permittivity also makes the discharge occur earlier and more violently in the gap.

关键词： plasma simulation dielectric barrier discharge PIC simulation

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dielectric barrier discharge plasma pretreatment on hydrolysis of microcrystalline cellulose

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Plasma Science and Technology 2017年第4期19卷 85-91页

作者：黄芳敏龙周洋刘飒秦正龙 School of Chemistry and Chemical Engineering Jiangsu Normal University

dielectric barrier discharge （DBD） plasma was used as a pretreatment method for downstream hydrolysis of microcrystalline cellulose （MCC）.The degree of polymerization （DP） of MCC decreased after it was pretreated by DBD plasma under a carder gas of air/argon.The effectiveness of depolymerization was found to be influenced by the crystallinity of MCC when under the pretreatment of DBD plasma.With the addition of tert-butyl alcohol in the treated MCC water suspension solution,depolymerization effectiveness of MCC was inhibited.When MCC was pretreated by DBD plasma for 30 min,the total reducing sugar concentration （TRSC） and liquefaction yield （LY） of pretreated-MCC （PMCC） increased by 82.98% and 34.18% respectively compared with those for raw MCC.

关键词： dielectric barrier discharge plasma cellulose pretreatment depolymerizafion

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dielectric barrier discharge Plasma-Induced Photocatalysis and Ozonation for the Treatment of Wastewater

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Plasma Science and Technology 2008年第1期10卷 100-105页

作者： MOK YoungSun JO Jin-Oh LEE Heon-Ju Department of Chemical Engineering Cheju National University Jeju 690-756 South Korea Department of Energy Engineering Cheju National University Jeju 690-756 South Korea

The physicochemical processes of dielectric barrier discharge （DBD） such as insitu formation of chemically active species and emission of ultraviolet （UV）/visible light were utilized for the treatment of a simulated wastewater formed with Acid Red 4 as the model organic contaminant. The chemically active species （mostly ozone） produced in the DBD reactor were well distributed in the wastewater using a porous gas diffuser, thereby increasing the gas-liquid contact area. For the purpose of making the best use of the light emission, a titanium oxide-based photocatalyst was incorporated in the wastewater treating system. The experimental parameters chosen were the voltage applied to the DBD reactor, the initial pH of the wastewater, and the concentration of hydrogen peroxide added to the wastewater. The results have clearly shown that the present system capable of degrading organic contaminants in two ways （photocatalysis and ozonation） may be a promising wastewater treatment technology.

关键词： dielectric barrier discharge ozone ultraviolet light photocatalyst wastewater

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Decomposition of trifluoromethane in a dielectric barrier discharge non-thermal plasma reactor

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Journal of Environmental Sciences 2012年第7期24卷 1234-1239页

作者： M. Sanjeeva Gandhi Y. S. Mok Department of Chemical and Biological Engineering Jeju National University

The decomposition of trifluoromethane （CHF3） was carried out using non-thermal plasma generated in a dielectric barrier discharge （DBD） reactor. The effects of reactor temperature, electric power, initial concentration and oxygen content were examined. The DBD reactor was able to completely destroy CHF3 with alumina beads as a packing material. The decomposition efficiency increased with increasing electric power and reactor temperature. The destruction of CHF3 gradually increased with the addition of O2 up to 2%, but further increase in the oxygen content led to a decrease in the decomposition efficiency. The degradation pathways were explained with the identified by-products. The main by-products from CHF3 were found to be COF2, CF4, CO2 and CO although the COF2 and CF4 disappeared when the plasma were combined with alumina catalyst.

关键词： trifluoromethane plasma alumina dielectric barrier discharge decomposition

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Numerical simulation study of ionization characteristics of argon dielectric barrier discharge

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Chinese Physics B 2023年第12期32卷 441-448页

作者：刘桂铭陈雷赵智博宋鹏 Liaoning Key Laboratory of Advanced Measurement and Test Technology for Aviation Propulsion System Shenyang Aerospace UniversityShenyang 110136China College of Mechanical and Electrical Engineering Dalian Minzu UniversityDalian 116600China

In order to better analyze the characteristics of particle distribution and its influencing factors in the ionized space during the process of coaxial dielectric barrier discharge,a self-designed two-dimensional axisymmetric structure exciter was used to carry out optical diagnosis,with the electron temperature calculated through Gaussian fitting.A plasma model was applied to conduct research on the discharge process through numerical simulation,with the changes in electron density and electron temperature were analyzed by using different discharge parameters.The research results show that with an increase in discharge voltage,pressure inside the reactor and relative permittivity,the discharge process is promoted.In addition,a rise in current density leads to an increase in the number of charged particles on the surface of the medium during the discharge process,while a rise in discharge intensity causes an increase in the electron density.Electron temperature decreases due to the increased loss of collision energy between particles.These results were confirmed by comparing experimental data with simulation results.

关键词： dielectric barrier discharge particle distribution properties electron density electron temperature

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Influence of non-uniform electric field distribution on the atmospheric pressure air dielectric barrier discharge

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Plasma Science and Technology 2021年第7期23卷 78-84页

作者：崔伟胜赵帅钱正芳孙一翎 Mahmoud AL-SALIHI 邓想全 Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100094People’s Republic of China

The dielectric barrier discharge(DBD)in air at atmospheric pressure is not suitable for industrial applications due to its randomly distributed discharge filaments.In this paper,the influence of the electric field distribution on the uniformity of DBD is theoretically analyzed and experimentally verified.It is found that a certain degree of uneven electric field distributions can control the development of electron avalanches and regulate their transition to streamers in the gap.The discharge phenomena and electrical characteristics prove that an enhanced Townsend discharge can be formed in atmospheric-pressure air with a curved-plate electrode.The spectral analysis further confirms that the gas temperature of the plasma produced by the curved-plate electrode is close to room temperature,which is beneficial for industrial applications.This paper presents the relationship between the electron avalanche transition and the formation of a uniform DBD,which can provide some references for the development and applications of the DBD in the future.

关键词： dielectric barrier discharge electric field distribution electron avalanche Townsend discharge

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