Investigation of gas heating effect and induced pressure waves of a single microdischarge in atmospheric pressure dielectric barrier discharges

Lin, Kun-Mo; Ou, Chin-Shyh; Wang, K.-C.; Liou, Z.-W.; Chuang, S.-Y.

doi:10.1016/j.ijheatmasstransfer.2020.120527

Cited by 3 publications

(2 citation statements)

References 39 publications

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“…The previous experiments and simulation reveal that the main prospective gas heating mechanisms in DBD are Joule heating due to the current flow through highly localized filaments, dielectric heating, heating due to elastic collisions of electrons, exothermic chemical reactions, ion bombardment (ion-flux) of the electrode surface and volume and surface recombination of species [30][31][32][33]. In our experiments, the dielectric heating due to the time varying electric field oscillation assumed to be negligible, as the dielectric response of common dielectrics in ∼GHz range [23,34] which is significantly higher than the applied power supply frequency.…”

Section: Discussionmentioning

confidence: 99%

Microdischarge dynamics of volume DBD under the natural convection airflow

Ussenov,

Ashirbek,

Dosbolayev

et al. 2024

Phys. Scr.

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The dielectric barrier discharge (DBD) at ambient air conditions exhibits discrete structure and contains thin microdischarge plasma filaments. Understanding the formation, self-interaction, and dynamics of such filaments is crucial towards the generation of uniform diffuse-like DBD in air, and also for the study of the memory effects and self-organized complex patterns. In this paper, the impact of natural convective flow, driven by the temperature gradient between self-heated discharge cell electrodes and ambient air, on the collective dynamics of microdischarges was studied in parallel-plate volume dielectric barrier discharge for the different geometrical arrangements. The horizontal arrangement corresponds to the parallel direction of discharge propagation and convective flow, while in the vertical arrangement buoyancy flow transverse to the discharge propagation column. For the horizontal arrangement, the randomly directed motion of microdischarges was observed. While at the vertical arrangement of the discharge cell, the buoyancy flow initiates the directed motion of the microdischarges following the gas flow. The continuous self-heating of the barrier electrodes during the DBD operation leads to a larger thermal gradient and increasing in the microdischarge channels. The larger thermal gradient results in a more pronounced directed motion of microdischarges with a higher velocity. The velocity of convective flow in the discharge gap was estimated by the simulation and compared with the mean velocity of MD channels obtained by the particle image velocimetry method.

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Section: Discussionmentioning

confidence: 99%

Microdischarge dynamics of volume DBD under the natural convection airflow

Ussenov,

Ashirbek,

Dosbolayev

et al. 2024

Phys. Scr.

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“…Several reports have applied a coupled model to correlate the chemistry process to the discharge process. For instance, Lin et al coupled a 1.5D plasma fluid model and a 3D gas flow model to study the gas heating properties and mechanisms in a DBD reactor microdischarge [30] or the O 3 generation properties influenced by the gas flow rate [31].…”

Section: Introductionmentioning

confidence: 99%

Kinetic model of grating-like DBD fed with flowing humid air

Zhang,

Liu,

Guo

et al. 2024

Plasma Sources Sci. Technol.

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This work proposes a coupled kinetic model to capture the spatiotemporal evolution behaviors of reactive species generated by a grating-like dielectric barrier discharge (DBD) operated in flowing humid air. The coupled model incorporates a zero-dimensional (0D) discharge model for the discharge filament and a 0D kinetic model or 2D fluid model for the afterglow region. The model is experimentally validated by the ozone measurements under different airflow rates and power levels. With the pseudo-1D plug flow approximation, the spatial distribution of species obtained by the 0D afterglow model agrees well with the 2D fluid model. The kinetics of reactive oxygen and nitrogen species (RONS) in the discharge and afterglow region and the underlying pathways are analyzed. It is predicted by the model that there exists an optimal discharge power or airflow rate to acquire a maximum density of short-lived species (OH, O2(a1Δ), HO2, etc.) delivered to a given location in the afterglow region. The key factor influencing the plasma chemistry is discharge power, regardless of initial species density, and less concerned with pulse width. The proposed model provides hints for a better understanding of DBD-relevant plasma chemistry operated in ambient air.

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Analysis of ozone generation in a planar atmospheric pressure air dielectric barrier discharge reactor

Lin

Liao

Lin

et al. 2023

Plasma Sources Sci. Technol.

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This work investigates O3 production in a planar atmospheric pressure air dielectric barrier discharge reactor numerically and experimentally. The surface temperature of the reactor is measured by an infrared (IR) thermal imager, and the O3 densities of cases in the reactive zone are measured by ultraviolet absorption spectroscopy. The 1.5D plasma fluid model (PFM) with transverse convection is employed to capture the average properties of a single microdischarge (MD) generated in the reactor and is integrated with the 3D gas flow model for modeling species densities in the reactor. The simulated temperature distribution of the reactor surface is validated by that measured and the simulated O3 densities agree with those measured at different locations and flow rates. In the 1.5D PFM, the simulated results show that the O3 molecules produced in the case of 4 SLM are much more than those produced in the case of 1 SLM though the O atoms produced in the case of 1 SLM are around 20 % more than those produced in the case of 4 SLM. In the case of 1 SLM, more than 48% of O3 molecular generated are destructed, while only around 14% of O3 molecules are destructed in the case of 4 SLM. The analysis shows that around 73% of O atoms generated in the 1.5D PFM are consumed in the formation of O3 molecules in the case of 4 SLM, while only 18% of O atoms generated in the case of 1 SLM are consumed in the formation of O3 molecules. The overall O3 yield efficiency reaches 97 g/kWh with the O3 concentration increasing to 2700 ppm in the case of 4 SLM, while the O3 yield efficiency decreases to 10 g/kWh and O3 concentration drops to 1400 ppm in the case of 1 SLM.

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Investigation of gas heating effect and induced pressure waves of a single microdischarge in atmospheric pressure dielectric barrier discharges

Cited by 3 publications

References 39 publications

Microdischarge dynamics of volume DBD under the natural convection airflow

Microdischarge dynamics of volume DBD under the natural convection airflow

Kinetic model of grating-like DBD fed with flowing humid air

Analysis of ozone generation in a planar atmospheric pressure air dielectric barrier discharge reactor

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