Abstract

A gliding arc discharge (GAD) with a water spray system was constructed. A non-thermal plasma, generated between two V shaped electrodes in an ambient argon driven by 100 Hz AC voltage, was investigated using optical emission spectroscopy (OES) with different gas flow rates (0.5, 1, 1.5, 2 , 2.5 , 3 1/min). Boltzmann plot method was used to calculate electron temperature (Te) and electron density (ne). The electrodes design was spectrally recognized and its Te value was about 0.588-0.863 eV, while the ne value of 6.875×1017-10.938×1017 cm-3. The results of the plasma diagnostics generated by gliding arc showed that increasing gas flow rates was associated with decreased electron temperature (Te), Debye length, and Debye Number, along with decreased electron density (ne) and plasma frequency.

Highlights

  • Gliding arc discharge is a quasi periodic electrical discharge

  • This paper presents the experimental work that includes construction of gliding plasma system and its operation at atmospheric pressure and a standard frequency of 100Hz

  • The gliding arc discharge (GAD) reactor consists of two, 1 mm thick, stainless steel diverging electrodes located under a feeding gas nozzle

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Summary

Introduction

Gliding arc discharge is a quasi periodic electrical discharge. Gliding discharge is extensively used in several plasma processing techniques such as the surface modification of different materials, water treatment, and air treatment [4] This discharge system consists of two V shaped electrodes, with a gas flowing between them at atmospheric pressure. It fabricates a comparatively cold nonequilibrium plasma with a complex time-space arrangement, counting quasi-equilibrium (hot) and non-equilibrium (cold) periods. Optical spectroscopy (OES) has been used for years to determine plasma parameters such as electron temperature, Debye length, Debye Number, electron density and plasma frequency. Plasma frequency can be given as in below [12]:

Experimental part
Results and discussion
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