Modelling of plasma chemical processes in stable corona discharges at thin wires

Naidis, G. V.

doi:10.1088/0022-3727/25/3/021

Cited by 24 publications

(11 citation statements)

References 18 publications

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“…The presumption that the three-body processes (8) and (9) are responsible for the electron attachment, made in our preliminary model [17], seems to be wrong in view of new experimental results. Our mass spectrometric experiments [l], [22], [25] confirmed the fact that instead of process (9) the main part of electrons is attached via reaction (l), which dominates in the vicinity of the highly stressed electrode [34]. Only a small fraction of electrons enter into the drift region, where they can be attached either to oxygen molecules (9) or to other electronegative molecules present in air.…”

Section: Discussionsupporting

confidence: 59%

Relaxing Phenomena in Negative Corona Discharge: New Aspects

Ráheľ

Pavlik

Holubcik

et al. 1999

Contrib. Plasma Phys.

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Two theories, explaining the time dependence of the negative corona discharge current in air, are confronted with new experimental results. The influence of the ozone concentration on the discharge current was experimentally confirmed in dry air and in mixtures of nitrogen with oxygen. Assuming that only the dissociative electron attachment to ozone molecule is a process being responsible for a reduction of the electron component in the total mean discharge current, the mean value of the electron attachment rate constant k = (3 -5.5)x lo-' cm-3 s-l was derived from the measured dependence of the discharge current on the ozone concentration. The calculated value of the rate constant k corresponds to the dissociative attachment of electron to ozone molecule via process e + 0 3 + products (0-or 0; negative ions).

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Section: Discussionsupporting

confidence: 59%

Relaxing Phenomena in Negative Corona Discharge: New Aspects

Ráheľ

Pavlik

Holubcik

et al. 1999

Contrib. Plasma Phys.

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“…The ozone concentration, both in positive and negative coronas, was strongly influenced by the radius R, the larger the radius the lower the ozone concentration at constant η. Both of these observations can be explained using the theory presented by Naidis several years ago [19]. His model can be used to calculate the rate of elementary electron-molecule reactions resulting in the formation of stable chemical product and was used to calculate the energy necessary for the formation of one ozone molecule in air for different radii of the outer electrode in a coaxial cylindrical electrode system in which the ozone was produced using a negative corona discharge.…”

Section: Ozone Generationmentioning

confidence: 99%

Positive and negative corona discharges in flowing carbon dioxide

Skalný

Stoica

Országh

et al. 2008

J. Phys. D: Appl. Phys.

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The effect of the gas flow rate (10–320 cm3 min−1) on the process of ozone formation in both positive and negative corona discharges has been studied using a coaxial cylindrical system of electrodes fed by dry CO2. The source of ozone is electron impact dissociation of carbon dioxide to liberate oxygen atoms and their subsequent formation of oxygen molecules, which may then form ozone by the well-known Chapman mechanism. Small increases in flow rate were found to cause a major increase in the discharge current measured in the negative corona discharge. This effect was found to correspond to observed changes in the ozone concentration within the discharge and is a consequence of dissociative electron attachment to ozone leading to negative ion formation in the discharge. In contrast no direct effect of ozone on the positive corona discharge current was observed. The observed increase in average positive ion mobility in the positive corona is ascribed to the conversion of ions into more mobile ions. Considerably higher ozone concentrations (up to 100 ppm) were found in the negative corona discharge. The effect of the geometry of the system was also explored by using three different stainless steel outer electrodes with diameters of 10, 15 and 27 mm. Ozone concentrations were found to decrease significantly with increasing radius of the outer electrode at the same average input energy density.

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“…However, according to the authors' knowledge there is no modelling study on the mechanism of CO 2 decomposition in the presence of a small amount of oxygen initiated by a negative corona discharge. Indeed there are only a few models of physicochemical processes in a negative corona discharge [40][41][42][43][44]. The modelling of such processes in corona discharges is complicated by the highly non-uniform electric field in the discharge gap, the complicated movement of gas in this region due to the electric wind and often by a lack of knowledge of individual rate constant data.…”

Section: Kinetic Modelmentioning

confidence: 99%

Experimental study of negative corona discharge in pure carbon dioxide and its mixtures with oxygen

Mikoviny

Kočan

Matejčík

et al. 2003

J. Phys. D: Appl. Phys.

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The products of a negative corona discharge in both pure CO2 and mixtures of CO2 + O2 have been studied using a coaxial cylindrical electrode geometry with particular emphasis on the production of ozone. The discharge current in pure CO2 was found to be highly sensitive to the presence of trace concentrations of molecular oxygen and to changes in the flow speed through the discharge. The effect of dissociative electron attachment to ozone on the discharge current was studied by measurements of ozone and CO production. The ozone concentration increases monotonically with increasing content of oxygen in the mixture with carbon dioxide, whereas the CO concentration exhibits a flat maximum for oxygen concentrations of around 4%. A simple kinetic model of the dominant chemical processes is described and compared with the experimental results.

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Modelling of plasma chemical processes in stable corona discharges at thin wires

Cited by 24 publications

References 18 publications

Relaxing Phenomena in Negative Corona Discharge: New Aspects

Relaxing Phenomena in Negative Corona Discharge: New Aspects

Positive and negative corona discharges in flowing carbon dioxide

Experimental study of negative corona discharge in pure carbon dioxide and its mixtures with oxygen

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