Small surface wave discharge at atmospheric pressure

Kiss’ovski, Zh; M, Kolev; Ivanov, A; Lishev, St.; Koleva, I.

doi:10.1088/0022-3727/42/18/182004

Cited by 22 publications

(12 citation statements)

References 14 publications

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“…It can be seen that the plasma length is strongly dependent on the microwave absorbed power. This behavior is also observed in a surface wave discharges generated by the pulse and CW modes [26]- [28]. It should be noted that tube dimension, wall material, and frequency can also affect the sustained surface wave plasma column length [27].…”

Section: Resultssupporting

confidence: 52%

Generation of Microwave Capillary Argon Plasmas at Atmospheric Pressure

Hemawan

Keefer

Badding

et al. 2016

IEEE Trans. Plasma Sci.

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A technique has been developed to generate stable Ar plasmas at atmospheric pressure inside of a quartz capillary tube. The microwave plasma in the capillary tube is produced by utilizing a single mode resonant circular cavity applicator with 2.45 GHz frequency excitation. The plasma can be confined or fully exposed outside the cavity as plasma jets depending on the operating conditions. The profile of the plasma front has been characterized as a conical tip or split branching jet plume. The measured discharge length and the power density of the plasma range from 6 to 10 cm and 35 to 75 W · cm −3 , respectively. Addition of CH 4 into the Ar plasma results in an increase in the abundances of excited CN and C 2 carbon radicals and a concomitant decrease in the intensity of the Ar emission.

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Section: Resultssupporting

confidence: 52%

Generation of Microwave Capillary Argon Plasmas at Atmospheric Pressure

Hemawan

Keefer

Badding

et al. 2016

IEEE Trans. Plasma Sci.

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“…The emission spectra of the Ar plasma jet alone confirmed that the major domination of spectral lines was obtained due to excited Ar species, whereas no spectral lines were emerging from Ar + ions. The emission spectra of the Ar plasma jet during the in situ degradation of isothiazolin‐3‐one at 27 kV showed various new peaks due to nitrogen second positive system (NSP) (336.3, 355.6, and 377.5 nm) and hydrogen species (H α = 655.8, H β = 489.6, and H γ = 432.3 nm) (hydrogen atom in the Balmer series) (Attri et al, 2015; Kissovski et al, 2009; National Institute of Standard and Technology (NIST Database), 2013; Onyshchenko et al, 2015; Rezaei et al, 2018). The identification of NSP during in situ processes may be ascribed to the breaking of isothiazolin‐3‐one molecules in aqueous and was excited via sharing energy by plasma species or by excitation of N 2 molecules in diffused ambient air at plasma jet–liquid interface.…”

Section: Resultsmentioning

confidence: 99%

Degradation of isothiazolin‐3‐one’s from an aqueous solution via a multi‐pin nonthermal atmospheric pressure plasma and its toxicity analysis

Pandiyaraj

Vasu²,

Kandavelu

et al. 2022

Food Processing Preservation

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Degradation of residuals of chemical compounds after use has attracted the attention of environmental scientists. In this work, the degradation of such a toxic biocide compound of isothiazolin-3-one from an aqueous solution using a novel multi-pin thermally nonequilibrium atmospheric pressure plasma reactor is reported. This investigation examined the impacts of different operating conditions on the decomposition of isothiazolin-3-one. Subsequently, the reactive excited plasma species formed and participated during the degradation processes were examined by optical emission spectrometer (OES), chemical dosimetry using terephthalic acid (TA), and spectroscopic determination involving potassium titanium (IV) oxalate. The efficiency of degradation of the plasma-treated isothiazolin-3-one from an aqueous solution was examined by UV-Vis spectrometry. The mineralization of isothiazolin-3-one was further examined by high-performance liquid chromatography (HPLC), determining conductivity, total organic carbon (TOC), and pH of the isothiazolin-3-one aqueous solution. Finally, nontoxicity of the plasma-treated isothiazolin-3-one solution was investigated by seed sprouting and germination tests using Vigna radiata L. Wildzek (Mung bean). The experimental results exhibit that a higher degradation percentage of 96.01% was attained for the isothiazolin-3-one treated at a longer treatment time and higher potential of 25 min and 31 kV, respectively. This may be attributed to the formation of various reactive oxygen and nitrogen species (RONS) as confirmed by OES and other spectroscopic analyses. The value of pH and TOC is found to be decreased, whereas the value of electrical conductivity of the isothiazolin-3-one aqueous solution is increased linearly with an increase in treatment time and applied voltage. This indicates the degradation of isothiazolin-3-one molecules and the formation of various ionic species in the solution. The toxicity investigation reveals that the plasma-treated isothiazolin-3-one aqueous solution is nontoxic in nature and useful for sprouting and germination of the Mung bean seeds compared with the untreated one. Overall, it can be concluded that the plasma-assisted process is ideally needed in various food, pharmaceutical, and textile industries as a highly efficient treatment of wastewater.

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“…[9] For the simultaneous modelling of the energy supply system, the plasma processes in the plasma source and the gas flow, it is appropriate to use the COMSOL software package. [10][11][12] F I G U R E 1 Schematic of electrothermal microwave plasma thruster The electric propulsion technologies for satellites are gaining popularity and are becoming the preferred choice over chemical thrusters. The main reason is that the chemical thrusters use the energy stored in the propellant, which is limited to the energy of the molecular bonds in it, while the electrothermal thrusters use the available onboard electrical energy to accelerate the propellant.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the plasma processes for propellant heating in electrothermal plasma thruster for nanosatellites

Ivanov

Kolev

Kiss’ovski

2021

Contributions to Plasma Physics

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Numerical investigation of the plasma processes in a cylindrical chamber with small dimensions of a novel microwave electrothermal plasma thruster for nanosatellites has been conducted. The absorbed microwave power from the electrons in the plasma column of the surface wave discharge is included in the computational model as a heat source with Gaussian distribution. The computational model takes into account the elastic and inelastic collisions of the electrons with the atoms in the ground state and two excited states (−s, −p) and the processes of recombination and deactivation of the plasma species in the volume and on the walls of the chamber. The computational model includes the flow of neutral gas and the processes in the plasma for effective heating of neutral particles by collisions not only with electrons but also with ions. Selected combinations of input power and propellant mass flow rates are used as initial parameters for the numerical investigation. The results show that at higher mass flow rates the heating of the neutral gas is more effective and at power levels of 4 W and propellant mass flow rate of 3 mg/s the electrothermal plasma thruster demonstrates effective performance and thrust levels in the order of 1 mN.

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Small surface wave discharge at atmospheric pressure

Cited by 22 publications

References 14 publications

Generation of Microwave Capillary Argon Plasmas at Atmospheric Pressure

Generation of Microwave Capillary Argon Plasmas at Atmospheric Pressure

Degradation of isothiazolin‐3‐one’s from an aqueous solution via a multi‐pin nonthermal atmospheric pressure plasma and its toxicity analysis

Numerical investigation of the plasma processes for propellant heating in electrothermal plasma thruster for nanosatellites

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