Effect of configuration and dimensions of reactor electrodes on electrical and optical corona discharge characteristics

El-Koramy, R. A.; Yehia, Ashraf; Omer, Mohamed

doi:10.1063/1.3389188

Cited by 13 publications

(4 citation statements)

References 41 publications

(31 reference statements)

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“…[1][2][3] Different from the negative dc corona discharge in air around a cylindrical electrode, the positive dc corona discharge distributes more evenly through visual observation. [4][5][6] Above a critical voltage level, a stable corona plasma layer around the cylindrical electrode and a broad ion flow region outside will be formed.…”

Section: Introductionmentioning

confidence: 99%

Self-sustained criterion with photoionization for positive dc corona plasmas between coaxial cylinders

Zheng

Zhang

2015

Physics of Plasmas

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The positive dc corona plasmas between coaxial cylinders in air under the application of a self-sustained criterion with photoionization are investigated in this paper. A photon absorption function suitable for cylindrical electrode, which can characterize the total photons within the ionization region, is proposed on the basis of the classic corona onset criteria. Based on the general fluid model with the self-sustained criterion, the role of photoionization in the ionization region is clarified. It is found that the surface electric field keeps constant under a relatively low corona current, while it is slightly weakened with the increase of the corona current. Similar tendencies can be found under different conductor radii and relative air densities. The small change of the surface electric field will become more significant for the electron density distribution as well as the ionization activity under a high corona current, compared with the results under the assumption of a constant surface field. The assumption that the surface electric field remains constant should be corrected with the increase of the corona current when the energetic electrons with a distance from the conductor surface are concerned.

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Section: Introductionmentioning

confidence: 99%

Self-sustained criterion with photoionization for positive dc corona plasmas between coaxial cylinders

Zheng

Zhang

2015

Physics of Plasmas

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“…When high voltage pulses are applied to the plasma reactor, a strong electromagnetic field is produced, which is capable of generating single-barrier nanosecond discharge. When barrier discharge takes place, it leads to the generation of O and N radicals, initially resulting in oxidation process of NO molecules present in the exhaust [4,15] as shown in the following equations: These two equations represent NO to NO 2 conversion reactions. NO reacts with O and O 3 to form NO 2 and lead to decrease in the concentration of NO and simultaneous increase in the concentration of NO 2 .…”

Section: Resultsmentioning

confidence: 99%

“…When high voltage pulses are applied to the plasma reactor, a strong electromagnetic field is produced, which is capable of generating single‐barrier nanosecond discharge. When barrier discharge takes place, it leads to the generation of O and N radicals, initially resulting in oxidation process of NO molecules present in the exhaust [4, 15] as shown in the following equations:

NO + O false\to N {normalO}_{2}; k = 1.4 \times 10^{- 12} c {normalm}^{3} / s

NO + {normalO}_{3} false\to N {normalO}_{2} + {normalO}_{2}; k = 1.8 \times 10^{- 14} c {normalm}^{3} / s

…”

Section: Resultsmentioning

confidence: 99%

“…Apart from the energisation, electrode shape, length and diameter are also the affecting parameters for removal efficiency. NO X removal efficiency is also said to be directly proportional to electrode diameter and length [13][14][15][16][17]. In this study, experiments are conducted to know optimal combination of power supply unit and electrode configuration.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nanosecond pulse discharge based nitrogen oxides treatment using different electrode configurations

et al. 2017

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Nowadays, the intensity of air pollution, due to the industries and automobiles, has been increasing continuously. Nitrogen oxides (NO X) are one of the most harmful pollutants, which are getting released from both automobile and stationary diesel engines. They essentially need to be removed from the exhaust using after treatment systems. However, the energy required to remove these pollutants is one of the major considerations in selecting the technology for pollutant removal from diesel engine exhaust. A study has been carried out on the non-thermal plasma-based NO X removal technique using various combinations of power supply units and electrode configurations. Three different electrode configurations are tested, in which two are cylindrical electrodes with diameters 3 and 5 mm, and the other one is a square electrode with a diagonal of 5 mm. A comparison is made between the results with two different pulse power supply units, PS-I: high-voltage direct current test set based and PS-II: DC-DC converter based. The square electrode with PS-II has been found to be the optimal combination, which has removed 85% of NO X from the exhaust at an energy density of 55.5 J/L, when the initial NO X concentration in the exhaust is 388 ppm.

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Catalytic combustion for cleaner burning: Innovative catalysts for low temperature diesel soot abatement

Palma

Iervolino

Meloni

2023

Combustion Chemistry and the Carbon Neutral Future

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Effect of configuration and dimensions of reactor electrodes on electrical and optical corona discharge characteristics

Cited by 13 publications

References 41 publications

Self-sustained criterion with photoionization for positive dc corona plasmas between coaxial cylinders

Self-sustained criterion with photoionization for positive dc corona plasmas between coaxial cylinders

Nanosecond pulse discharge based nitrogen oxides treatment using different electrode configurations

Catalytic combustion for cleaner burning: Innovative catalysts for low temperature diesel soot abatement

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