Influence of the Gas Humidity on the Uniformity of RF‐Powered Atmospheric‐Pressure Low‐Temperature DBD Plasmas

Koo, Il Gyo; Cho, Jin Hoon

doi:10.1002/ppap.200700068

Cited by 15 publications

(16 citation statements)

References 34 publications

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“…At lower actuator voltages, this transition is gradual but it is more sudden at the highest voltages like the 50 kV case. Koo et al [9] investigated the effect of moisture content on the spatial uniformity of a 13.56 MHz RFpowered dielectric barrier discharge using helium gas. Their study showed that, as the moisture content increased, the character of the discharge changed from uniform glow to streak discharge which is consistent with the results shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Effect of Relative Humidity on Dielectric Barrier Discharge Plasma Actuator Body Force

Wicks

Thomas

2015

AIAA Journal

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Section: Resultsmentioning

confidence: 99%

Effect of Relative Humidity on Dielectric Barrier Discharge Plasma Actuator Body Force

Wicks

Thomas

2015

AIAA Journal

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“…and experiment [52,53] . The mechanism behind n e reduction in the solution surface is supposed to be as a result of the enhanced process of electron-ion recombination [52,54] .…”

Section: F I G U R Ementioning

confidence: 99%

Plasma‐enhanced evaporation and its impact on plasma properties and gaseous chemistry in a pin‐to‐water pulsed discharge

Yang

Qiao

et al. 2023

Plasma Processes & Polymers

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The plasma in contact with liquids has led to various novel applications such as plasma biomedicine, material synthesis, and so on. However, the phenomenon of evaporation under plasma treatment and its impact on plasma–liquid interactions has a limited understanding. In this study, the spatially and temporally resolved behavior of water vapor production and its induced influences on plasma properties and gaseous chemistry were studied in detail in an atmospheric pressure pin‐to‐water pulsed He discharge. Diagnostic methods such as laser‐induced fluorescence (LIF) and high‐resolution optical emission spectroscopy (OES) were applied to determine the water vapor and OH radical densities, as well as key plasma parameters such as the gas temperature and electron density. It shows that the physicochemical properties of plasma vary among different discharge regions due to evaporation behavior stimulated during the pulsed discharge‐on phase. In addition, using simulation based on the experimental data, the mechanisms of how water vapor affects the observed spatiotemporal behaviors of OH radicals in different discharge regions are understood. Compared to the pin‐anode and liquid‐cathode sheath regions, proper electron parameters such as density and temperature, as well as water vapor density in the plasma‐positive column, significantly enhance the production of reactive OH radical through the dominant path of electron‐stimulated H2O dissociation. However, higher levels of electron parameters in the intense discharge region near the positive‐pin boundary enhance OH dissociation and finally result in the hollow distribution of OH density. From the global kinetic plasma simulation, the production of reactive hydroxide species playing key roles in plasma medicine treatments, such as O, H, HO2, H2O2, and hydrated ions including H+(H2O)4 and H+(H2O)5, are promoted noticeably as a result of the enhanced water evaporation process.

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“…Increased attachment and reduced power coupling to the electrons lead to the decrease of the electron density as the oxygen concentration in the background gas and the discharge electronegativity increase. 43 As discussed earlier, in HeþO 2 plasmas the generation of ROS requires energetic electrons to initiate the reactions that lead to the formation of O and other reactive species (see Fig. 4(b)).…”

Section: -mentioning

confidence: 99%

1-D fluid model of atmospheric-pressure rf He+O2 cold plasmas: Parametric study and critical evaluation

et al. 2011

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In this paper atmospheric-pressure rf He+O2 cold plasmas are studied by means of a 1-D fluid model. 17 species and 60 key reactions selected from a study of 250+ reactions are incorporated in the model. O2+, O3-, and O are the dominant positive ion, negative ion, and reactive oxygen species, respectively. Ground state O is mainly generated by electron induced reactions and quenching of atomic and molecular oxygen metastables, while three-body reactions leading to the formation of O2 and O3 are the main mechanisms responsible for O destruction. The fraction of input power dissipated by ions is ∼20%. For the conditions considered in the study ∼6% of the input power is coupled to ions in the bulk and this amount will increase with increasing electronegativity. Radial and electrode losses of neutral species are in most cases negligible when compared to gas phase processes as these losses are diffusion limited due to the large collisionality of the plasma. The electrode loss rate of neutral species is found to be nearly independent of the surface adsorption probability p for p > 0.001 and therefore plasma dosage can be quantified even if p is not known precisely.

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Influence of the Gas Humidity on the Uniformity of RF‐Powered Atmospheric‐Pressure Low‐Temperature DBD Plasmas

Cited by 15 publications

References 34 publications

Effect of Relative Humidity on Dielectric Barrier Discharge Plasma Actuator Body Force

Effect of Relative Humidity on Dielectric Barrier Discharge Plasma Actuator Body Force

Plasma‐enhanced evaporation and its impact on plasma properties and gaseous chemistry in a pin‐to‐water pulsed discharge

1-D fluid model of atmospheric-pressure rf He+O2 cold plasmas: Parametric study and critical evaluation

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