Investigation of the Atmospheric Helium Dielectric Barrier Discharge Driven by a Realistic Distorted-Sinusoidal Voltage Power Source

Hung, Chin‐Te; Chiu, Yen-Chih; Hwang, Feng Nan; Chiang, Meng Hsueh; Wu, Jong‐Shinn; Wang, Y. C.

doi:10.1007/s11090-010-9275-y

Cited by 8 publications

(8 citation statements)

References 28 publications

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“…In addition, the concentrations of some of the 'fast' neutral species such as He * m and He * 2 are in the order of 10 18 m −3 , which is much higher than those of the charged species, and agree with some previous simulations for helium DBD (e.g. [21,22]). Figure 4 shows the corresponding temporal variations of the spatially averaged number densities of the 'slow' neutral species using the TMA with the same simulation conditions (five ICs, five SCs and four RSs) as presented in figure 3.…”

Section: Resultssupporting

confidence: 89%

A temporal multi-scale algorithm for efficient fluid modeling of a one-dimensional gas discharge

Lin

et al. 2014

Plasma Sources Sci. Technol.

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In this study, we present a temporal multi-scale algorithm (TMA) for efficient fluid modeling of a one-dimensional gas discharge with complex plasma chemistry. A helium dielectric barrier discharge driven by a power source with a frequency of 25 kHz is used as an example to demonstrate the superior capability of the TMA in accelerating fluid modeling simulations, while maintaining the same accuracy as compared to lengthy benchmarking fluid modeling using a single timescale approach. The plasma chemistry considers 36 species and 121 reaction channels, which include some impurities such as nitrogen (25 ppm), oxygen (10 ppm) and water vapor (1 ppm), in addition to the helium itself. The results show that the runtime using the TMA can be dramatically reduced to 4% (25 times faster) with a relative difference of spatially averaged number densities generally less than 1% for all species between the TMA and the benchmarking cases when five initial cycles, five supplementary cycles and four repeated stages are used. Further reduction of the accuracy requirements to 44% for some specific species can lead to 92 times faster performance with the use of two initial cycles, two supplementary cycles and two repeated stages. The outlook for multi-dimensional fluid modeling considering a gas flow field is also described at the end of the paper.

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Section: Resultssupporting

confidence: 89%

A temporal multi-scale algorithm for efficient fluid modeling of a one-dimensional gas discharge

Lin

et al. 2014

Plasma Sources Sci. Technol.

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“…), following the breakdown (figure 8(a)). The rate for reactions 32, 28, 44 and 45 reduces after breakdown since the species + He 2 and He* m reduce as explained above, while the rate for reaction 29 remains constant since He* 2 has constant concentration between two successive breakdown events [53,59]. From figure 8(b) it can be seen that + N 2 is mainly converted to + N 4 through the linked reaction 41 (…”

Section: Effect Of Nitrogen Impurity Levelsmentioning

confidence: 79%

“…) since the concentration of He* 2 remains high and constant between two successive breakdown events [53,59]. However at higher level of impurities this is not valid.…”

Section: Effect Of Nitrogen Impurity Levelsmentioning

confidence: 96%

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Numerical modeling of the effect of the level of nitrogen impurities in a helium parallel plate dielectric barrier discharge

Lazarou

Koukounis

Chiper

et al. 2015

Plasma Sources Sci. Technol.

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In this paper a validated 2D axisymmetric plasma fluid model was used to study the influence of the level of nitrogen impurities on the processes that occur in a helium parallel plate dielectric barrier discharge. The level of nitrogen impurities was varied in the range 0.1-500 ppm. It was observed that the nitrogen impurities significantly affect the dominant ion species at breakdown and the discharge characteristics. Specifically, three different dominant ions were found, which are strongly dependent on the level of nitrogen impurities. These are: + He 2 (0.1-35 ppm), + N 2 (35-150 ppm) and + N 4 (150-500 ppm). In addition, the results show that the discharge characteristics are dependent on the dominant ion species at breakdown.

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“…The He gas was also excited and ionized, but it was still inert and did not react with FAME. However, the reactive species of He still played an important role in the reaction because many possible reaction channels took place from this gas such as momentum transfer, dimer-induced dissociative ionization, ion–electron recombination and so on 45 . This assisted to produce more He species and free electrons that could transfer the energy to H 2 to maintain the plasma production.…”

Section: Resultsmentioning

confidence: 99%

Low-temperature and atmospheric pressure plasma for palm biodiesel hydrogenation

Kongprawes

Wongsawaeng

Ngaosuwan

et al. 2021

Sci Rep

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Partially hydrogenated fatty acid methyl ester (H-FAME) is conventionally produced through partial hydrogenation under high pressure and elevated temperature in the presence of a catalyst. Herein, a novel green, catalyst-free, non-thermal and atmospheric pressure dielectric barrier discharge (DBD) plasma was employed instead of a conventional method to hydrogenate palm FAME. H-FAME became more saturated with the conversion of C18:2 and C18:3 of 47.4 and 100%, respectively, at 100 W input power, 1 mm gas-filled gap size and 80% H2 in the mixed gas at room temperature for 5 h, causing a reduction of the iodine value from 50.2 to 43.5. Oxidation stability increased from 12.8 to 20 h while a cloud point changed from 13.5 to 16 °C. Interestingly, DBD plasma hydrogenation resulted in no trans-fatty acid formation which provided a positive effect on the cloud point. This green DBD plasma system showed a superior performance to a conventional catalytic reaction. It is an alternative method that is safe from explosion due to the mild operating condition, as well as being highly environmentally friendly by reducing waste and energy utilization from the regeneration process required for a catalytic process. This novel green plasma hydrogenation technique could also be applied to other liquid-based processes.

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Investigation of the Atmospheric Helium Dielectric Barrier Discharge Driven by a Realistic Distorted-Sinusoidal Voltage Power Source

Cited by 8 publications

References 28 publications

A temporal multi-scale algorithm for efficient fluid modeling of a one-dimensional gas discharge

A temporal multi-scale algorithm for efficient fluid modeling of a one-dimensional gas discharge

Numerical modeling of the effect of the level of nitrogen impurities in a helium parallel plate dielectric barrier discharge

Low-temperature and atmospheric pressure plasma for palm biodiesel hydrogenation

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