OH and O radicals production in atmospheric pressure air/Ar/H<sub>2</sub>O gliding arc discharge plasma jet

N C ROY; M R TALUKDER; A N CHOWDHURY

doi:10.1088/2058-6272/aa86a7

Plasma Science and Technology > 2017 > 19(12): 125402. > DOI: 10.1088/2058-6272/aa86a7

N C ROY, M R TALUKDER, A N CHOWDHURY. OH and O radicals production in atmospheric pressure air/Ar/H₂O gliding arc discharge plasma jet[J]. Plasma Science and Technology, 2017, 19(12): 125402. DOI: 10.1088/2058-6272/aa86a7

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OH and O radicals production in atmospheric pressure air/Ar/H₂O gliding arc discharge plasma jet

1 Plasma Science and Technology Laboratory, Department of Applied Physics and Electronic Engineering, University of Rajshahi, Rajshahi 6205, Bangladesh 2 Bangladesh Council of Scientific and Industrial Research Laboratory Rajshahi, Rajshahi 6206, Bangladesh

Funds: Partial financial support has been provided by the University Grants Commission: A-663-5/52/UGC/Eng-9/2013 and A-670-5/52/UGC/Eng-4/2013

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Received Date: July 18, 2017

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Abstract

Abstract

Atmospheric pressure air/Ar/H₂O gliding arc discharge plasma is produced by a pulsed dc power supply. An optical emission spectroscopic (OES) diagnostic technique is used for the characterization of plasmas and for identifications of OH and O radicals along with other species in the plasmas. The OES diagnostic technique reveals the excitation T_x≈5550–9000 K, rotational T_r≈1350–2700 K and gas T_g≈850–1600 K temperatures, and electron density n_e ≈(1.1-1.9 )× 10¹⁴ cm^-3 under different experimental conditions. The production and destruction of OH and O radicals are investigated as functions of applied voltage and air flow rate. Relative intensities of OH and O radicals indicate that their production rates are increased with increasing Ar content in the gas mixture and applied voltage. ne reveals that the higher densities of OH and O radicals are produced in the discharge due to more effective electron impact dissociation of H₂O and O₂ molecules caused by higher kinetic energies as gained by electrons from the enhanced electric field as well as by enhanced n_e. The productions of OH and O are decreasing with increasing air flow rate due to removal of Joule heat from the discharge region but enhanced air flow rate significantly modifies discharge maintenance properties. Besides, T_g significantly reduces with the enhanced air flow rate. This investigation reveals that Ar plays a significant role in the production of OH and O radicals.
- reactive oxygen species (ROS),
- optical emission spectroscopy (OES),
- gliding arc discharge,
- plasma kinetics,
- broadening mechanism

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OH and O radicals production in atmospheric pressure air/Ar/H₂O gliding arc discharge plasma jet

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