Initiation of pulsed corona discharge under supercritical conditions

Lock, Evgeniya H.; Saveliev, Alexei V.; Kennedy, Lawrence A.

doi:10.1109/tps.2005.845302

Cited by 45 publications

(21 citation statements)

References 16 publications

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“…Indeed, operation at atmospheric pressure is a natural choice for discharges with characteristic lengths of hundreds of microns. Nonetheless, operation at pressures as low as a few tens of mTorr47 and as high as several tens of atmospheres48, 49 have also been reported. Operation at lower pressure is preferred for applications such as gas monitoring in the feed/exhaust pipes of a large‐scale vacuum system 50.…”

Section: Introductionmentioning

confidence: 99%

Microplasmas: Sources, Particle Kinetics, and Biomedical Applications

Iza

Kim

Lee

et al. 2008

Plasma Processes & Polymers

479

339

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Thanks to their portability and the non‐equilibrium character of the discharges, microplasmas are finding application in many scientific disciplines. Although microplasma research has traditionally been application driven, microplasmas represent a new realm in plasma physics that still is not fully understood. This paper reviews existing microplasma sources and discusses charged particle kinetics in various microdischarges. The non‐equilibrium character highlighted in this manuscript raises concerns about the accuracy of fluid models and should trigger further kinetic studies of high‐pressure microdischarges. Finally, an outlook is presented on the biomedical application of microplasmas.

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Section: Introductionmentioning

confidence: 99%

Microplasmas: Sources, Particle Kinetics, and Biomedical Applications

Iza

Kim

Lee

et al. 2008

Plasma Processes & Polymers

479

339

View full text Add to dashboard Cite

show abstract

“…The insulation strength of SCCO 2 was about 10 times higher than that of SF 6 at 0.5kPa which is the usual gas pressure of high power switchgear. This means that the insulation strength of SCCO 2 is enough to substitute SF 6 gas which has been used in electrical apparatus. Using the result, we expect that the time for switching and dielectric recovery could be reduced using SCCO 2 fluid as an insulating medium.…”

Section: Resultsmentioning

confidence: 99%

“…Especially, supercritical carbon dioxide (SCCO 2 ) has been widely used because it is nontoxic, nonflammable, low cost and low critical temperature of 304K. Using electrical discharge plasma inside supercritical SCCO 2 has been emerged as a useful chemical reaction tool which could be applied environment and biomedical fields [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Supercritical Fluids as an Insulating Medium for High Speed Switching

Shon¹,

Song²,

Oh³

et al. 2016

Journal of Electrical Engineering and Technology

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-The paper investigates the insulation properties of the supercritical CO 2 (SCCO 2 ) fluid as an insulating medium for electrical apparatuses. The insulating material is crucial for electrical apparatuses and SF 6 gas has been widely used for high power electrical apparatuses. There have been many research efforts to develop substituents for SF 6 gas because of high global warming potential. We obtained above 350 kV/mm insulation strength with 12.0 MPa SCCO 2 . The positive and negative IEC standard pulses are applied between two 10 mm diameter spherical electrodes. The insulation strength of SCCO 2 is at least 2.5 times higher than that of CO 2 gas at 6.0MPa. The insulation strength of SCCO 2 fluid is about 10 times higher than that of SF 6 at 0.5MPa which is the ordinary operating pressure of electrical switchgears. Using the result, we expect that the time for switching and dielectric recovery could be reduced using SCCO 2 fluid as an insulating medium.

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“…Argon is also inexpensive and its optical transparency is superior to that of carbon dioxide since it is monatomic. Lock et al initiated pulsed corona discharge under supercritical conditions, and reported that the breakdown voltage for a wire-in-cylinder configuration is three times lower than estimates based on Paschen's law due to the large in-homogeneties in the density of the supercritical fluid near the critical point [3]. Recently, the discharge plasma in supercritical fluids is an underdeveloped field, and the pre-breakdown phenomena are not well understood.…”

Section: Introductionmentioning

confidence: 99%

Pulsed Discharge Plasma Treatment of Phenol in Sub-critical and Supercritical Fluids for Polymer Synthesis

Sasaki

Diono

Goto

2010

Trans. Mat. Res. Soc. Japan

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In this work, reactions of phenol were carried out in supercritical argon (critical temperature, Tc: 150.7 K, critical pressure, Pc: 4.8 MPa) with pulsed discharge plasma to understand reaction characteristics and to evaluate possibility that this technique will be applicable for a new "green" polymerization technique of functional polymeric materials. Experiments in subcritical water or in supercritical argon were conducted through the operation of a specially-designed SUS316 batch-type reactor (inner volume: 900 mL) at 373-523 K and 1-25 MPa, or at 303-373 K and 5 -15 MPa, respectively. The electrode configuration consisted of a point (negative electrode) and a planar surface (positive electrode), which were made of tungsten and stainless steel, respectively. The distance between the two electrodes was fixed at 1 mm. Two kinds of power supply devices (BPFN and MPC) were employed. As results using a BPFN, it was found that reaction behavior in subcritical water at 373-523 K, 1-25 MPa with less than 4000 times pulsed discharges basically similar to that in supercritical argon, but polymerized products of phenol could be obtained under larger pulsed discharge times like 5000 times at identical conditions. In contrast, phenol could be converted into hydroquinone but no polymerized product could be confirmed in supercritical argon.

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Initiation of pulsed corona discharge under supercritical conditions

Cited by 45 publications

References 16 publications

Microplasmas: Sources, Particle Kinetics, and Biomedical Applications

Microplasmas: Sources, Particle Kinetics, and Biomedical Applications

Investigation of the Supercritical Fluids as an Insulating Medium for High Speed Switching

Pulsed Discharge Plasma Treatment of Phenol in Sub-critical and Supercritical Fluids for Polymer Synthesis

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