• 한국항공우주학회지
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• 제40권6호
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• pp.492-498
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• 2012

DBD(Dielectric Barrier Discharge) 플라즈마 액츄에이터의 설계 파라미터에 따른 특성을 연구하였다. 방전전압, 주파수, 전극의 간격, 폭, 길이, 유전체 두께에 따른 DBD 플라즈마 액츄에이터의 유속 및 소모전력을 측정하였다. 방전전압과 주파수가 클수록 유속과 소모전력은 증가하였다. 전극간격은 클수록 소모전력은 감소하면서 유속은 증가하였으나, 플라즈마 방전을 위해 높은 전압이 요구되었다. 상부전극폭은 좁을수록, 하부전극폭은 넓을수록 일정한 소모전력으로 유속을 증가시킬 수 있었다. 주어진 방전조건과 전극형상에서 DBD 플라즈마 액츄에이터의 성능을 예측할 수 있을 것으로 기대된다.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2012년도 제38회 춘계학술대회논문집
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• pp.527-528
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• 2012

플라즈마 유동제어를 통한 공기저항저감을 위해 DBD(Dielectric Barrier Discharge) 플라즈마 구동기를 설계하였고, 2D 시험모델의 풍동시험을 통해 항력저감을 측정하였다. 풍속이 없는 경우에는 유동박리 및 표면마찰저항이 존재하지 않으므로 플라즈마 유동제어를 통한 항력저감도 없었다. 2m/s의 풍속에서 유동박리제어를 통해 항력이 9.7%까지 감소됨을 확인하였으며, 풍속이 증가할수록 항력저감은 감소하였다.

• 한국대기환경학회지
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• 제19권2호
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• pp.157-165
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• 2003

A combined process of non-thermal plasma and catalytic technique has been investigated to treat $CH_3$CN gas in the atmosphere. A planar type dielectric barrier discharge (DBD) reactor has been used to generate the non-thermal plasma that produces various chemically active species, such as O, N, OH, $O_3$, ion, electrons, etc. Several different types of the beads. which are Molecular Sieve (MS) 5A, MS 13X, Pt/alumina beads, are packed into the DBD reactor, and have been tested to characterize the effects of adsorption and catalytic process on treating the $CH_3$CN gas in the DBD reactor. The test results showed that the operating power consumption and the amounts of the by-products of the non-thermal plasma process can be reduced by the assistance of the adsorption and catalytic process.

• 한국수산과학회지
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• 제52권6호
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• pp.617-624
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• 2019

Dielectric barrier discharge (DBD) plasma is one of the promising next generation non-thermal technologies for food sterilization. The present study investigated the effects of DBD plasma on the reduction of most common food-borne pathogenic bacteria (Staphylococcus aureus, Bacillus cereus, Vibrio parahaemolyticus, Salmonella enterica) and sanitary indicative bacteria (Escherichia coli) in the suspension (initial inoculum of approx. 9 log CFU/mL). The bacterial counts were significantly (P<0.05) reduced with the increase in the treatment time (1-30 min) of DBD plasma in the suspension. The D-values (time for 90% reduction) of DBD plasma by first-order kinetics for S. aureus, B. cereus, V. parahaemolyticus, S. enterica, and E. coli were 17.76, 19.96, 32.89, 21.55, and 15.24 min, respectively (R²>0.90). These results specifically showed that 30 min of DBD plasma treatment in > 90% reduction of seafood-borne pathogenic and sanitary indicative bacteria. This suspension study may provide the basic data for use in seafood processing and distribution.

• 한국유체기계학회 논문집
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• 제15권3호
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• pp.46-50
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• 2012

Plasma actuator makes parallel flow on the wall surface by the interaction between plasma and neutral air particles. Dielectric barrier discharge (DBD) plasma actuator is widely studied as one type of plasma actuators, which consists of one electrode exposed to the environmental gas and the other encapsulated by a dielectric material. This paper is experimentally focused on the performance of DBD plasma actuator mounted on a flat plate, which depends on kinds of the electrode materials, their thicknesses and the supplied voltage including its frequency. We measured the velocity magnitudes of the induced flow by a stagnation probe as a performance parameter of the plasma actuators. The velocity profiles of the flow induced by the plasma actuators are similar in all measurement cases. The magnitude of the induced velocity is strongly influenced by the thickness of the electrodes and the frequency of the input voltage. The performance of DBD plasma actuators is related to the electric properties of the electrode materials such as the ionization energy and the electrical resistivity.

• Korean Chemical Engineering Research
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• 제57권3호
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• pp.432-437
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• 2019

유연전극 기반의 대기압 부유전극 유전체 장벽 방전 (floating electrode-dielectric barrier discharge, FE-DBD) 시스템을 개발하여 플라즈마 특성을 분석하였다. 유연한 파워전극(powered electrode)을 구성하는 유연유전체로 polytetrafluoroethylene (PTFE), polydiemethylsiloxane (PDMS), polyethylene terephthalate (PET)를 사용하여 플라즈마를 발생하였을 때 플라즈마의 광학적 세기와 전자온도는 파워전극에 인가하는 전압이 증가할수록 증가하였고, 전압이 일정할 때는 PTFE < PDMS < PET 순으로 증가하였다. 이는 유전체의 종류와 전압에 따른 축전용량의 변화로 설명할 수 있었고, 유연전극 기반의 대기압 FE-DBD 플라즈마의 특성은 유연한 파워전극을 구성하는 유전체와 파워전극에 인가되는 전압을 변화함으로써 조절될 수 있음을 의미한다. 유연전극 대기압 FE-DBD 시스템은 피부 곡면을 따라 플라즈마가 발생될 수 있으므로 플라즈마 메디신(plasma medicine)에 유용할 것으로 기대한다.

• 한국환경과학회지
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• 제23권6호
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• pp.1165-1173
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• 2014

For the field application of dielectric barrier discharge plasma reactor in nutrient solution culture, a filtration-DBD (dielectric barrier discharge) plasma reactor was investigated for the Ralstonia solanacearum which causes bacterial wilt in aquiculture. The filtration-DBD plasma reactor system of this study was consisted of filter, plasma reactor, reservoir. The DBD plasma reactor consisted of a quartz dielectric tube, discharge electrode (inner) and ground electrode (outer). The experimental results showed that the inactivation of R. solanacearum with filter media type in filter reactor ranked in the following order: anthracite > fiber ball > sand > ceramic ball > quartz ceramic. In filtration + plasma process, disinfection effect with the voltage was found to small. In disinfection time of 120 minutes, residual R. solanacearum concentration was 1.17 log (15 CFU/mL). When the continuous disinfection time was 120 minute, disinfection effect was thought to keep the four days. In sporadic operation mode of 30 minutes disinfection - 24 hours break, residual R. solanacearum concentration after five days was 0.3 log (2 CFU/mL). It is considered that most of R. solanacearum has been inactivated substantially.

• Korean Journal of Chemical Engineering
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• 제35권12호
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• pp.2452-2463
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• 2018

Surface treatment of sol-gel bioglass is required to increase its biomedical applications. In this study, a dielectric barrier discharge (DBD) plasma treatment in atmospheric pressure was performed on the surface of [$SiO_2-CaO-P_2O_5-B_2O_3$] sol-gel derived glass. The obtained bioglass was treated by plasma using discharge current 12 mA with an exposure period for 30 min. The type of discharge can be characterized by measuring the discharge current and applied potential waveform and the power dissipation. Apatite formation on the surface of the DBD-treated and untreated samples after soaking in simulated body fluid (SBF) at $37^{\circ}C$ is characterized by Fourier transform infrared spectroscopy (FTIR), X-Ray diffraction (XRD), inductively coupled plasma (ICP-OES) and scanning electron microscopy coupled with energy dispersive spectroscopy (SEM/EDS). We observed a marked increase in the amount of apatite deposited on the surface of the treated plasma samples than those of the untreated ones, indicating that DBD plasma treatment is an efficient method and capable of modifying the surface of glass beside effectively transforming it into highly bioactive materials.

• Korean Chemical Engineering Research
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• 제45권5호
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• pp.455-459
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• 2007

배리어(dielectric-barrier discharge: DBD) 반응기에서 솔-젤 방법으로 제조한 $Pt/TiO_2$를 넣고 플라즈마 에너지를 사용하여 메탄전환반응 연구를 수행하였다. 제조된 촉매는 기존 금속산화물과는 다른 방법으로 환원을 하였으며, 플라즈마를 사용한 환원방법(plasma-assisted reduction: PAR)이라고 명명하였다. $Pt/TiO_2$ 촉매는 Pt 담지량 및 소성온도에 관계없이 20분 이내에 환원이 완료되었다. 3 wt% $Pt/TiO_2$ 촉매와 5 wt% $Pt/TiO_2$ 촉매를 $600^{\circ}C$에서 소성하여 PAR 방법으로 환원했을 때 메탄의 전환율은 40%로 가장 높았다. DBD 반응기에서 $Pt/TiO_2$ 촉매를 사용하였을 경우 촉매가 없을 때보다 $C_2H_6$, $C_3H_8$와 $C_4H_{10}$과 같은 알칸의 선택성의 매우 높게 나타났다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제42회 동계 정기 학술대회 초록집
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• pp.458-458
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• 2012

Fuel Cell is used stacking metal or polymer substrate. This hydro property of substrate surface is very important. Usually, surface property is hydrophilic. The surface oxidation of SUS is investigated through plasma treatments with an atmospheric-pressure dielectric barrier discharge (DBD) for increasing hydrophilic property. The plasma process makes an experiment under various operating conditions of the DBD, which operating conditions are treatment time, plasma gas mixture ratio, the plasma source supply frequency. Two kinds of SUS substrate, SUS-304 and SUS 316L, were used. Discharge frequency has a crucial impact on equipment performance and gas treatment. After the plasma treatment of a SUS plate, highly improved wettability was noted. But, when high oxygen supply, the substrate damaged seriously.