• Title/Summary/Keyword: Slit Electrode

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Corona Discharge and Ozone Generation Characteristics of a Slit Dielectric Barrier Discharge Type Plasma Reactor with a Third Electrode (3전극이 부설된 틈새 장벽방전형 플라즈마장치의 코로나 방전 및 오존발생 특성)

  • Moon, Jae-Duk;Jung, Jae-Seung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.3
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    • pp.583-587
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    • 2007
  • Corona discharge and ozone generation characteristics of a slit dielectric barrier discharge type wire-plate plasma reactor with a third electrode have been investigated. When a third electrode is installed on a slit of the slit barrier, where an intense corona discharge occurs, it is found that a significantly increased ozone output could be obtained. This, however, indicates that the third electrode can activate the corona discharges both of the discharge wire and the slit of the slit barrier in the plasma reactor. As a result, a thin stainless wire, used as the third electrode has a strong effect to influence the corona discharge of the slit and corona wire, especially to the negative corona discharge. Higher amounts of the output ozone and ozone yield, about 1.27 and 1.29 times for the negative corona discharge, can be obtained with the third electrode, which reveals the effectiveness of the third electrode.

A Study on Collecting Electrode Design for Developing Electrostatic Precipitator(ESP) of Urban Railway Underground Tunnels (도시철도 지하터널용 전기집진기 개발을 위한 집진극 형상에 대한 기초연구)

  • Koo, Tae Yong;Kim, Yong Min;Hong, Jung Hee;Hwang, Jungho
    • Particle and aerosol research
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    • v.9 no.2
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    • pp.79-87
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    • 2013
  • In this study, the characteristics of turbulent flow and collection efficiency for an one-stage electrostatic precipitator(ESP) with slit type collecting electrode for urban railway underground tunnels were obtained using computational fluid dynamics(CFD) commercial code FLUENT 6.3 and lab-scale experiments. The electrostatic precipitator was operated under high gas velocity(3~12m/s). Five different designs of collecting electrode, flat plate-type and a slit-type of 3mm, 5mm, 7mm and 10mm slit width and four various gas velocity(3, 6, 9, and 12m/s) were used and applied. A standard k-${\varepsilon}$ model in CFD commercial code FLUENT 6.3 was used for flow simulation. The flow simulation results showed that the turbulent intensity of flat plate-type was higher than slit-type under all gas velocity conditions and also the turbulent intensity of flat plate-type was increased continuously, but in case of slit-type was maintained at constant range. And, the turbulent intensity was decreased according to increasing of slit width. The experimental results showed that the collection efficiency of slit-type was higher than flat plate-type under all gas velocity conditions. And, over 6m/s gas velocity condition, the collection efficiency of 5mm and 7mm was highest, when compared to 3mm and 10mm.

Two-dimensional LC analyses for increasing operation voltage in the FFS mode with fine slit pixel electrode

  • Kim, H.Y.;Lee, W.H.;Park, J.Y.;Eom, T.J.;Kim, J.P.;Lee, K.H.;Lee, J.Y.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2006.08a
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    • pp.842-845
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    • 2006
  • We studied for high transmittance panel technology in the FFS mode. We found that fine slit of pixel electrode makes increase of panel transmittance, and at the same time this structure has an issue which is increasing operation voltage (Vop). We analyzed the reason of high Vop in the FFS pixel with fine slit using two-dimensional LC analyses. Finally we suggest the solution which has high transmittance with suitable operating voltage.

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The Effects of Electric Field Variation by The Third Electrode on Water Electrophysicochemical Characteristics (제3전극에 의한 전계변화가 수중 전기물리화학적 특성에 미치는 영향)

  • Kim, Jin-Gyu
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.9
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    • pp.136-141
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    • 2010
  • In this paper, after the third electrode type oxidant generator which could format non-uniform electric field in water had been manufactured and installed, by direct electrolysis, the effects of the hydrogen potential and oxidation reduction potential characteristics attendant upon electric field change on a higher concentration oxidant generation characteristics were investigated. Consequently, as the third electrode was installed in the middle of two slit electrodes and the polarity of applied power was changed, it was observed that the third electrode system with the positive electrode can generate a higher concentration oxidant, hydrogen potential and oxidation reduction potential as compared with that of the negative electrode. It is because the positive electrode was bombarded mostly energetic electrons and the negative electrode was bombarded mainly by less energetic positive ions.

Discharge and Ozone Generation Characteristics of a Wire-Plate Discharge System with a Slit Barrier (슬릿 유전체 장벽을 갖는 선대 평판형 방전장치의 방전 및 오존 발생특성)

  • Moon Jae-Duk;Jung Jae-Seung
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.54 no.9
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    • pp.421-426
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    • 2005
  • A wire-plate discharge system with a slit barrier has been proposed and investigated experimentally by focusing on the discharges on the slit barrier and ozone generation characteristics. This wire-plate discharge system with a slit barrier can generate an intensive corona discharges, and produce corona discharge twice, once from the corona wire electrode and second time from the surface and the slits of the slit dielectric barrier. As a result this propose wire-plate discharge system with the slit barrier can produce greatly increased ozone than without the slit barrier. This type of wire-plate discharge system with the slit barrier could be used for effective ozone generation as a means with retard to the removal of pollutant gas

Effective Ozone Generation Utilizing a Slit Barrier (틈새 장벽을 이용한 효과적인 오존 발생)

  • Moon, Jae-Duk;Jung, Jae-Seung
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.55 no.6
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    • pp.323-327
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    • 2006
  • In this paper a new wire-wire discharge system with a slit dielectric harrier has been proposed, and, its corona discharge and ozone generation characteristics have been investigated experimentally. When the slit mica barrier is installed between corona wires, instead of the grounded plate electrode, a significant increase in the generation of ozone, about 2.2 times higher than that of the conventional ones without the slit harrier, could be obtained. Photographs show that this type of discharge system with a slit barrier was found to produce a corona discharge twice, once from the upper and bottom corona wires, and. again from both sides of surfaces and slits of the slit barrier. As a result, the proposed discharge system has the potential to increase significantly ozone production and it may be useful as an effective means for removing pollutant gases.

Pixel design for Improving Transmittance in OCB LCD

  • Lee, K.C.;Sha, Y.A.;Su, P.J.;Hsieh, C.H.;Chang, K.H.;Hsiao, C.C.;Fuh, S.Y.;Cheng, W.Y.;Liao, Y.C.;Yang, J.C.;Lo, K-L;Lee, D.W.;Chang, Y.P.;Shiu, J.W.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2007.08a
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    • pp.395-398
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    • 2007
  • Two new cell structures for optical compensated bend were proposed. There are two groups of slit electrodes, which are driven by two different signals corresponding to the entire electrode as common electrode. The transmittance was enhanced without increasing the response time and light leakage. Compared with the traditional OCB mode, the increment of the transmittance of each kind is about 90% and 30%.

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Optimal Pixel Design for Low Driving Single Gamma Curve and Single Gap Transflective Fringe Field Switching Display (단일갭 반투과 FFS 액정 디스플레이를 위한 최적 화소 디자인)

  • Jeong, Youn-Hak;Lim, Young-Jin;Jeong, Eun;Lee, Seung-Hee
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.20 no.12
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    • pp.1068-1071
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    • 2007
  • When a dielectric layer, in-cell retarder (ICR) is formed between electrode and LC layer to get a single gap transflective fringe-field switching (FFS) display, the operating voltage ($V_{op}$) is highly increased due to the thickness of dielectric material. But, we also knew the phenomenon that the increasing rate of Vop is different whether the 1st common electrode was composed of plate type or slit type. In this paper, the common electrode in transmissive part was composed of slit type which had less steepness effect of the Vop and in reflective part was composed of plate type. The rubbing angle of reflective part can be adjusted properly to match the voltage dependent transmittance and reflectance.

Optimal pixel design for low driving single gamma curve and single gap transflective fringe field switching display (단일랩 반투과 FFS 액정 디스플레이를 위한 최적 화소 디자인)

  • Jeong, Youn-Hak;Lim, Young-Jin;Jeong, En;Lee, Jeung-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.06a
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    • pp.435-436
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    • 2007
  • In general, Single gap transflective FFS display has an in-cell retarder (ICR) between reflective electrode and liquid crystal (LC) layer. Therefore, Operating voltage is highly increased due to this thick dielectric material. But, we also knew the phenomenon that the increasing rate of Vop is different whether the 1st common electrode was composed of plate type or slit type. In this paper, the common electrode in transmissive part was composed of slit type which had less steepness effect of the V op and in reflective part was composed of plate type. The rubbing angle of reflective part can be adjusted properly to match the voltage dependent transmittance and reflectance.

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A High Efficiency Electrolytic Cell by Superposing Pulsed Corona Discharge in Water (수중 펄스코로나 방전을 중첩한 고효율 강전해수 발생장치)

  • 이재용;김진규;정성진;박승록;문재덕
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.50 no.2
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    • pp.79-85
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    • 2001
  • A conventional electrolyzing cell has been made by an ion exchange membrane inbetween parallel plate electrodes. A low dc voltage is applied to the electrodes for electrolyzing and the efficiency is remained in low. in this study, a novel electrolyzing cell with a pair of slit-type third electrodes installed inbetween parallel plate electrodes has been proposed and investigated experimentally. And pulse power wa supplied to between each electrodes. This slit type of third electrodes can concentrate the strong electric fields at the every its edges to accelerate the electrolyzing powers, and to generate oxygen bubble discharges for generating oxidants. And moreover the slits eliminate the space charge limiting action and the temperature of the water by leaking out through the slits from electrolyzing region to outside of the main electrode region. As a result, it was found that a strong electorzed water of pH 2.8 and pH 10.5 and oxidants dissolved water of 1 [ppm] in acidic water were obtained with a tap water fed at the electric current of 2 [A], which however were several times higher oxidant and ion concentration quantity compared with the conventional cell.

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