• Title/Summary/Keyword: Dielectric barrier discharge (DBD)

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A Study on the Dielectric Barrier Discharges Plasmas of Flat Atmospheric Pressure Using an AC Pulse Voltage (교류 펄스 전압을 이용한 평판형 대기압 유전격벽방전 플라즈마의 특성 분석)

  • Lee, Jong-Bong;Ha, Chang-Seung;Kim, Dong-Hyun;Lee, Ho-Jun;Lee, Hae-June
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.5
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    • pp.717-720
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    • 2012
  • Various types of dielectric-barrier-discharge (DBD) devices have been developed for diverse applications for the last decade. In this study, a flat non-thermal DBD micro plasma source under atmospheric pressure has been developed. The flat-panel type plasma is generated by bipolar pulse voltages, and driving gas is air. In this study, the plasma source was investigated with intensified charge coupled device (ICCD) images and Optical Emission Spectroscopy (OES). The micro discharges are generated on the crossed electrodes. For theoretical analysis, 2-dimensional fluid simulation was performed. The plasma source can be driven in air, and thus the operation cost is low and the range of application is wide.

각도를 가지는 전극 구조를 가지는 DBD 방전에서 전극 간격과 압력 변화에 따른 방전 특성 연구

  • Sim, Seung-Bo;Bae, Hyo-Won;Lee, Ho-Jun;Lee, Hae-Jun
    • Proceedings of the Korean Vacuum Society Conference
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    • 2012.02a
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    • pp.500-500
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    • 2012
  • 플라즈마 디스플레이 패널(PDP)는 미소체적의 dielectric barrier discharge (DBD)를 이용한 한 예로 볼 수 있다. PDP 셀은 실험을 통하여 방전 특성을 분석하기에 아주 작은 크기이기 때문에 시뮬레이션을 이용하는 것이 방전 특성을 분석하기에 유용하다. 시뮬레이션 방법 중 유체 시뮬레이션은 높은 압력에서 기체 방전을 분석하기에 아주 유용한 방법이다. PDP 전극 각도를 바꿈으로써 발광 효율을 높일 수 있음이 논문으로 발표 되었다. 이 발표에서는 2차원 유체 시뮬레이션을 사용하여 전극의 각도 변화뿐만 아니라 전극 간격과 압력 변화에 따른 방전 특성 변화를 연구하였다. 평판 전극의 각도 변화에 따라 전기장 세기, 방전 공간 내 전하 및 여기된 입자수 및 분포, 방전 개시 전압 등의 진단을 통하여 결과를 분석하였다. 전극 간격이 길어질수록 convex 구조의 효율 증가가 크게 나타났으며 압력이 커질수록 concave 구조의 효율 증가가 크게 나타났다.

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DBD (Dielectric Barrier Discharge) Plasma Device for Biomedical Applications

  • Kim, Yun-Jung;Kim, Jung-Gil;Jeong, Jong-Yun;Han, Guk-Hui;Lee, Min-Gyeong;Cha, Deok-Bong;Han, Sang-Ho;Park, Gyeong-Sun;Jo, Gwang-Seop
    • Proceedings of the Korean Vacuum Society Conference
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    • 2012.02a
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    • pp.461-461
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    • 2012
  • 미생물 처리에 적용하기 위한 저주파 Dielectric Barrier Discharge (DBD) Plasma Device를 고안하였다. 현재 생의학적으로 광범위하게 사용되는 Plasma Jet Device는 가스를 주입해 주어야 한다. 그러나 Plasma Jet Device의 노즐로부터 배출되는 가스는 Media의 흔들림과 증발 유발시키며 미생물에게 영향을 미친다. 가스 배출에 의한 영향을 없애기 위해 가스 주입이 없는 Plasma 발생 장치를 제작 하고, 미생물에 적용하여 그 효과를 관찰하였다. 본 실험에 사용된 Plasma 발생 장치는 대기 중에서 방전된다. 가스의 주입 없이 낮은 방전 전압과 균일한 플라즈마의 발생을 위해 Plasma 발생 장치의 접지 전극으로 Mesh를 사용 하였다. 본 Plasma 발생 장치로 발생된 Plasma를 곰팡이(Fusariumgraminearum)에 조사한 결과, 조사 시간이 길어짐에 따라 배양된 곰팡이의 Colony 수가 Plasma를 조사하지 않은 경우에 비해 줄어드는 것을 확인할 수 있었다. 또한 각각의 곰팡이 Colony의 크기도 줄어들었다.

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Electrical and NO Conversion Characteristics of Dielectric Barrier Discharge Process (질소산화물 제거를 위한 무성 방전 공정의 전기 및 NO 전환 특성)

  • Lee, Yong-Hwan;Jeong, Jae-U;Jo, Mu-Hyeon
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.51 no.1
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    • pp.15-21
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    • 2002
  • We investigated effects of electrical, physical, and chemical parameters on energy transfer, NO conversion, and light emission in the dielectric barrier discharge (DBD) process. As gap distance between electrodes increased, discharge onset voltage increased. However, as gap distance between electrodes increased, electric field which initiates discharge showed approximately the same value, 30kV/cm. The discharge onset voltage of the coarse surface electrode was lower than that of the smooth surface electrode. And, energy transfer was slightly enhanced in the coarse electrode condition. However, NO conversion rate decreased with the coarse surface electrode because more uniform discharge can be obtained on the smooth surface electrode. The NO conversion rate increased with decreasing the initial concentration, so the DBD process is more feasible in the lower concentration condition. The variation of gas residence time tested at the same energy density in the experiment did not affect on the NO conversion. The result shows that the NO conversion rate mainly depends on the energy density. The DBD process is able to adjust on plasma-photocatalyst process because it emits the short wavelength light in the range of ultraviolet. The intensity of light emission increased with the increase of the energy transfer to the reactor and the gas flow rate.

Electromagnetic Characteristics of Dielectric Barrier Discharge Plasma Based on Fluid Dynamical Modeling (유체역학에 바탕한 플라즈마 모델링을 통한 유전체 장벽 방전 플라즈마의 전파 특성 해석)

  • Kim, Yu-Na;Oh, Il-Young;Hong, Yong-Jun;Yook, Jong-Gwan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.24 no.3
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    • pp.331-336
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    • 2013
  • In this paper, plasma modeling is achieved using fluid dynamics, thereby electron density is derived. The way proposes the key to overcoming the limitations of conventional researches which adopt simplified plasma model. The result is coupled with Maxwell-Boltzmann system in order to calculate scattering waves in various incident angle. The first part is dedicated to perform plasma modeling in dielectric barrier discharge(DBD) structure. Suzen-Huang model is adopted among various models due to the fact that it uses time independent variables to calculated potential and electron distribution in static system. The second part deals with finite difference time domain(FDTD) scheme which computes the scattered waves when the modulated Gaussian pulse is incident. Founded on it, radar cross section(RCS) is observed. Consequently, RCS is decreased by 1~2 dB with DBD plasma. The result is analogous to the RCS measurement in other researches.

Monostatic RCS Measurement for Dielectric Barrier Discharge Plasma (유전체 장벽 방전 플라즈마의 Monostatic 레이다 단면적 측정)

  • Lee, Hyunjae;Jung, Inkyun;Ha, Jungje;Shin, Woongjae;Yang, Jin Mo;Lee, Yongshik;Yook, Jong-Gwan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.27 no.3
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    • pp.246-252
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    • 2016
  • In this paper, reduction of monostatic RCS by DBD plasma is measured. For the calibration of monostatic RCS, S-parameters of two metallic plate in different sizes are used and the result is within 0.4 dB error. Metallic plate is put behind DBD plasma generator for measuring reduction of monostatic RCS by DBD plasma. To prevent arc discharge between metallic plate and DBD plasma generator, measurement is progressed spacing the interval between metallic plate and DBD plasma generator. As a result, maximum reduction of monostatic RCS is about 3 dB at 7.4 GHz.

Analysis and Performance Evaluation of DBD Actuator for Plasma Flow Control (플라즈마 유동 제어를 위한 DBD 엑츄에이터 해석 및 성능평가)

  • Lee, Chang-Wook;Yun, Su-Hwan;Kim, Tae-Gyu
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2012.05a
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    • pp.290-293
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    • 2012
  • The analysis and performance evaluation of DBD actuator for plasma flow control was described. The experimental apparatus was designed to measure the flow velocity as the discharge conditions, and to find out the optimal discharge condition of the DBD actuator. The average-velocity increased with increasing the discharge voltage. The experimental results was compared with CFD analysis.

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Evaluation on Decomposition Processes of Laundry wastewater produced from Steam Generator (증기발생기 세정폐액 처리 공정 평가)

  • 강덕원;이홍주;최영우;이두호
    • Proceedings of the Korean Radioactive Waste Society Conference
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    • 2003.11a
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    • pp.78-82
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    • 2003
  • For the decomposition of laundry wastewater containing Fe-EDTA produced from the steam generators in nuclear power plants, Supercritical Water Oxidation (SCWO) Process, Photocatalytic Oxidation (PO) Process, and Dielectric Barrier Discharge (DBD) Atmospheric Pressure Plasma Process were evaluated. Even though EDTA was converted over 99.98 % by the SCWO process, it was estimated that the countermeasure against corrosion of the equipment should be reinforced for the process stability. It was considered that the PO process is not appropriate for the decomposition of high concentrated laundry wastewater since the conversion ratio of EDTA was around 10 %. Finally, High efficiency of the decomposition of organic matter (methylene blue) was obtained using DBD process even low energy was supplied. However there is still room for the evaluation of EDTA decomposition in order that the DBD process should be applied for the field samples.

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Remove of Three Pathogenic Bacteria in Cultured Fish and Tetracycline Antibiotics Using Underwater Non-Thermal Dielectric Barrier Discharge Plasma (수중 비열 유전체장벽 방전 플라즈마를 이용한 양식어류의 병원성세균 3종 및 Tetracycline계 항생제 제거)

  • Cho, Kyu Seok;Park, Jong Ho
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.55 no.6
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    • pp.910-916
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    • 2022
  • The purpose of this study is to evaluate the effect of underwater non-thermal dielectric barrier discharge plasma (DBD plasma) on the sterilization of three types of pathogenic bacteria that cause diseases in freshwater fish and the reduction of a tetracycline antibiotics. This experiment was conducted in the DBD plasma generator, and the voltages used to generate plasma were 11.6 kV and 23.1 kV. The measurement intervals were 0, 1, 5, 10 and 15 min. As a result of DBD plasma treatment, Aeromonas hydrophila, Edwardsiella tarda and Pseudomonas fluorescens were removed 93-99% after 5 min at 23.1 kV, and the tetracycline antibiotics were reduced 70-95% after 15 min at 23.1 kV. In this study, as a result of treating the effluent with DBD plasma at a fish farm where the medicinal bath was conducted with oxytetracycline-HCl (OTC-HCl) products, OTC-HCl decreased by 62% after 10 min at 23.1 kV.

Experiment on the Sterilization Performance of Airborne Bacteria in Indoor Spaces using the Variation of Ozone Concentration Generated According to the Discharge Time of a Plasma Module with a Dielectric Barrier Discharge Technology (유전체 장벽방전 플라즈마 방전시간에 따른 오존 발생 농도변화의 값을 통한 실내 공간 내 부유세균 살균성능에 대한 실험)

  • Su Yeon Lee;Chang Soo Kim;Gyu Ri Kim;Jong Eon Im
    • Journal of the Society of Disaster Information
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    • v.19 no.2
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    • pp.344-351
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    • 2023
  • Purpose: This study aimed to evaluate the effectiveness of a dielectric barrier discharge (DBD) plasma module for sterilizing airborne bacteria in indoor spaces and measure the concentration of ozone generated during plasma discharge. Method: The DBD plasma module was installed in a 76m3 space, and air samples were collected under various discharge times to compare the reduction of airborne bacteria. Result: The results showed a significant decrease in airborne bacteria, ranging from 92.057% to 99.999%, with an average ozone concentration of 0.04 ppm, below the reference value. Conclusion: The study suggests that plasma discharge can be used as a means of preventing the spread of airborne bacteria and viruses, while ensuring safety for human exposure.