Modeling of Streamer Dynamics in Atmospheric‐Pressure Air Plasma Jets

Naidis, G. V.

doi:10.1002/ppap.201600127

Cited by 16 publications

(4 citation statements)

References 30 publications

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“…Because of the limited use of electron diagnostics for high-pressure weakly ionized plasmas, numerical studies, particle-in-cell Monte Carlo collision simulations [105] and hybrid-fluid models [106,112,113] have provided profound insights into the electron kinetics and characteristics of rf capacitive discharges at atmospheric pressure. However, experimental investigation is still important.…”

Section: Radio-frequency Capacitive Dischargementioning

confidence: 99%

Electron characterization in weakly ionized collisional plasmas: from principles to techniques

Park

Choe

Moon

et al. 2018

Advances in Physics: X

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Weakly ionized plasmas at or near 1 atm pressure, or atmospheric-pressure plasmas, have received increasing attention due to their scientific significance and potential for use in a variety of applications, particularly for medicine, agriculture, and food. However, there is a large imbalance between scientific research on plasma physics and applications, which is partly due to the considerable differences in the characteristics of these plasmas compared with those of low-pressure plasmas. This discrepancy is particularly related to the difficulty in performing plasma diagnostics for highly collisional plasmas. Information on electrons (such as the electron density and temperature) is essential since electrons play a dominant role in the generation of active species related to the physical and chemical processes inside the plasma. So far, limited diagnostics have been available for electrons such as Thomson scattering and optical emission diagnostics based on equilibrium models. Here, we review the available diagnostic methods along with their merits and limitations for characterizing electrons in weakly ionized collisional plasmas. Particular attention is paid to continuum radiation-based spectroscopy, which facilitates multidimensional imaging of electron density and temperature. The future impact of these plasmas on relevant fields (i.e. laboratory and industrial plasmas and their applications) is also addressed.

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Section: Radio-frequency Capacitive Dischargementioning

confidence: 99%

Electron characterization in weakly ionized collisional plasmas: from principles to techniques

Park

Choe

Moon

et al. 2018

Advances in Physics: X

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“…Atmospheric pressure plasma jets propagate along a predetermined path defined by the flow of noble gases. [1][2][3][4][5][6][7][8] They normally appear as straight plasma plumes and are widely used for various applications such as plasma medicine. [9][10][11][12][13][14][15][16] High speed photographs show that the plasma is actually like a "bullet" with a propagation velocity of 10 4 to 10 5 m/s.…”

Section: Introductionmentioning

confidence: 99%

The effect of tube geometry on the chiral plasma

et al. 2019

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A chiral plasma plume has recently been reported inside a circular quartz tube without the use of an external magnetic field. It is believed that the quartz tube plays an important role in the formation of the chiral plasma plume. In this paper, to better understand how this interesting structure is generated, the effect of the tube geometry on the chiral plasma is investigated. First, the effect of the thickness of the tube wall on the chiral plasma is investigated. It is interesting to find that a too thin or too thick tube wall is not favorable for generating the chiral plasma. The chiral plasma plume can be obtained only at the tube wall thickness of 2 mm. Second, the effect of the diameter of the tube on the chiral plasma is investigated. It is found that, when a tube with an inner diameter of 2 mm is connected with a tube with an inner diameter of 4 mm and the high voltage electrode is placed in the tube with an inner diameter of 2 mm, a diffuse plasma is generated in the tube with an inner diameter of 2 mm, it propagates into the tube with an inner diameter of 4 mm, and a chiral plasma can be obtained at a distance of about 2 cm away from the joint of the two tubes. Third, to further understand how the tube diameter affects the appearance of the chiral plasma, horn shaped tubes with different opening angles are tested. It is found that, when the opening angle is 5 , the chiral plasma formation in the straight part of the tube can maintain the chiral shape and keep propagating in the horn shaped tube but with a much longer pitch. Fourth, to disrupt the axial symmetry, square quartz tubes are used. No chiral plasma can be obtained in the square quartz tubes under all experimental conditions. In addition, when a circular quartz tube is connected with a square tube, the chiral plasma formation in the circular quartz tube changes to a straight plasma plume in the square tube. Finally, the high voltage electrode is placed away from the center of the circular tube to disrupt its symmetry, and it is found that the chiral plasma plume can always be seen even if the high voltage is placed next to the inner wall of the tube.

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“…Various research groups have extensively explored the chemical aspect, specifically the influence of reactive oxygen and nitrogen species (RONS) [8][9][10][11]. Conversely, there has been considerably less emphasis on the physical effects, encompassing thermal radiation, electric fields, ultraviolet (UV), and vacuum ultraviolet (VUV) radiation [12][13][14].…”

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confidence: 99%

The biological effect of the physical energy of plasma

Li,

Zhao,

Liu

et al. 2024

Plasma Sources Sci. Technol.

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Since the publication of the initial paper on atmospheric pressure plasma sterilization by Dr. Laroussi in 1996, researchers have contributed to the field with an extensive number of papers on plasma medicine. However, these studies have primarily concentrated on the biological impacts of the chemical reactive components generated by plasma, specifically focusing on the effects of reactive oxygen and nitrogen species (RONS). Conversely, when plasma directly interacts with biological organisms, there are additional physical energies involved, such as electric fields, UV/VUV radiation, heat, etc., which may also play crucial roles in their interaction. This paper delves into this aspect by using the simplest bactericidal effect as a model for biological effects. Three dielectrics—Al2O3, quartz, and MgF2 glass—are employed to isolate the chemical active components, enabling the examination of the bactericidal effects of the electric field, UV, and VUV, respectively. The findings indicate that the plasma-induced electric field can induce irreversible electroporation, effectively eliminating bacteria at 27 kV/cm. Notably, at a plasma-induced electric field of 40 kV/cm, sterilization efficiency experiences a significant enhancement. The bactericidal effects of UV and VUV are closely linked to the choice of the plasma's working gas. Specifically, when Ar is the working gas, the bactericidal effect of UV surpasses that of using only the plasma-induced electric field by two orders of magnitude, while using He results in only a one-order increase. Despite VUV radiation being considerably weaker than UV, its bactericidal effect remains substantial. In instances where He plasma is utilized, the addition of VUV doubles the bactericidal effect. In short, this paper pioneers the exploration of the biological effects of plasma's physical energy, providing essential insights for the advancement of plasma medicine.

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Modeling of Streamer Dynamics in Atmospheric‐Pressure Air Plasma Jets

Cited by 16 publications

References 30 publications

Electron characterization in weakly ionized collisional plasmas: from principles to techniques

Electron characterization in weakly ionized collisional plasmas: from principles to techniques

The effect of tube geometry on the chiral plasma

The biological effect of the physical energy of plasma

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