Effect of gas flow rate on breakdown voltage in a rotating gliding arc reactor

Understanding breakdown phenomena in rotating gliding arc discharge (RGA) is of interest to tailor them for specific applications. This work revealed that the breakdown voltage in a RGA reactor was not dictated by collisional effects i.e., change in flow rate. The observation was consistent for both the discharge gas medium argon and nitrogen. The collisional effect variation was implemented by varying the operating flow rates i.e., 5 SLPM which is transitional in nature, and 50 SLPM which is turbulent in nature having localized micro-eddies. The observation also indicated failure of Paschen law in RGA having shortest gap between the electrodes of order of mm, operated under atmospheric pressure conditions. Collisional ineffectiveness indicates possibility of streamer formation which needs to be further investigated in future. This work marks preliminary and important step towards understanding the breakdown phenomena in atmospheric RGAs operated under different flow regimes such as laminar/transitional and turbulent.

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DISCHARGE CHARACTERISTICS OF GLIDING ARC PLASMA REACTOR WITH ARGON/NITROGEN

JOURNAL OF ADVANCES IN PHYSICS ◽

10.24297/jap.v7i1.1736 ◽

2015 ◽

Vol 7 (1) ◽

pp. 1316-1323 ◽

Cited By ~ 2

Author(s):

Gamal Elaragi

Keyword(s):

Discharge Current ◽

Atmospheric Pressure ◽

Gas Flow ◽

Discharge Plasma ◽

Arc Discharge ◽

Arc Plasma ◽

Gliding Arc Discharge ◽

Gas Flow Rate ◽

Argon Gas ◽

Gliding Arc

Gliding Arc Discharge plasma has properties of both thermal and non-thermal plasma conditions. Gliding arc discharge plasma in the atmospheric pressure with argon/nitrogen and its characteristics are described. Some experimental results about alternating current gliding arc plasma generator have been obtained. It seems that the current density strongly depends on the gas, and increased with increasing discharge current and gas flow rate. Also, the discharge current of gliding arc Discharge plasma in Nitrogengas is greater than one in Argon gas because of Nitrogen gas need to higher breakdown voltage than Argon gas. The intensity of gliding arc discharge plasma increased with increasing the gas flow rate. In addition to the oscillograms of discharge current in each case of Argon & Nitrogen were obtained. Electron temperatures of Argon and Nitrogen plasma were calculated to be 22800 K, 8400 K. The characteristics of both Argon & Nitrogen gases in atmospheric pressure were investigated like current density, electron density with flow rates (5, 10, 20, and 40) Standard Cubic foot per Hour. All the experimental results were tabulated.

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Analysis of the interaction between particles and gliding arc discharge in a spouted bed reactor

MATEC Web of Conferences ◽

10.1051/matecconf/201926804008 ◽

2019 ◽

Vol 268 ◽

pp. 04008

Author(s):

Atsushi Nakajima ◽

Satoshi Kodama ◽

Hidetoshi Sekiguchi

Keyword(s):

Flow Rate ◽

Retention Time ◽

Applied Voltage ◽

Gas Flow ◽

Arc Discharge ◽

Gliding Arc Discharge ◽

Gas Flow Rate ◽

Spouted Bed ◽

Gliding Arc ◽

Contact Frequency

In this paper, the interaction between particles and gliding arcs in a spouted bed reactor combined with gliding arc discharge was investigated using a high-speed camera. Based on the images captured by the camera, we evaluated the retention time for gliding arcs, the contact frequency of particles with the gliding arc, and the passage area of the gliding arc until its disappearance. The effects of the gas flow rate; electrode angle, which is same as the cone angle of the spouted bed; and applied voltage of gliding arcs were investigated. The retention time for gliding arcs was extended by a high applied voltage, the passage area was increased at a high gas flow rate, and the contact frequency was increased by decreasing the electrode angle. The results obtained here can support the optimization of particle treatment processes in a spouted bed with gliding arc discharge.

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