Characteristics of atmospheric pressure air discharges with a liquid cathode and a metal anode

Bruggeman, Peter; Ribežl, E.; Mašláni, A.; Degroote, Joris; Malesevic, Alexander; Rego, Robby; Vierendeels, Jan; Leys, Christophe

doi:10.1088/0963-0252/17/2/025012

Cited by 145 publications

(121 citation statements)

References 31 publications

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“…Due to a change in liquid properties in time ͑such as conductivity͒ in the case of distilled water, the voltage drops. 16 In Fig. 4 the anode potential drop at a current of 25 mA is plotted as a function of water electrode conductivity.…”

Section: Resultsmentioning

confidence: 99%

Anode pattern formation in atmospheric pressure air glow discharges with water anode

Verreycken

Bruggeman

Leys³

2009

Journal of Applied Physics

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Pattern formation in the anode layer at a water electrode in atmospheric pressure glow discharges in air is studied. With increasing current a sequence of different anode spot structures occurs from a constricted homogeneous spot in the case of small currents to a pattern consisting of small distinct spots for larger currents. The dependence of the number of spots on the current is (18.5+0.4N) mA with N the number of spots. The spots group together and form stripe patterns. Disappearance of the spots with increasing conductivity of the electrode seems to indicate that mechanisms of electrical nature govern the phenomenon. Similarities and differences with other experiments and models revealing pattern formation in glow discharges are discussed

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Section: Resultsmentioning

confidence: 99%

Anode pattern formation in atmospheric pressure air glow discharges with water anode

Verreycken

Bruggeman

Leys³

2009

Journal of Applied Physics

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“…Recently, APGD plasmas with various liquid electrodes have been studied at different currents and distances from the liquid electrode [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26], while the other plasma generation parameters were faintly investigated. Nevertheless, the phenomena of glow discharge generated at atmospheric pressure are still poorly understood.…”

Section: Introductionmentioning

confidence: 99%

“…Maximum temperatures and emission intensities were observed near the cathode region. Recently, Bruggeman et al [22] reported the rotational temperatures of OH and N 2 , the electron number density and the H excitation temperature achieved using distilled water and a solution of NaOH and NaCl as liquid cathodes. These parameters were studied as a function of the discharge current, the solution conductivity and the distance from the cathode.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic Characterization of Miniaturized Atmospheric-Pressure dc Glow Discharge Generated in Contact with Flowing Small Size Liquid Cathode

Jamróz

Żyrnicki

2011

Plasma Chem Plasma Process

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The miniaturized atmospheric pressure glow discharge (APGD) generated between a solid electrode and a flowing small size liquid cathode (dimension 2 mm) was investigated here using optical emission spectroscopy. The discharge was studied in an open air atmosphere, and the spectral characteristics of the plasma source was examined. Analysed APGD was operated at a discharge voltage of 1,100-1,700 V, a discharge current of 20 mA and gaps between a solid anode and a liquid cathode in the range from 0.5 to 3.5 mm. The emission intensities of the main species were measured as a function of various experimental conditions, including the solution flow rate, the gap between the electrodes, and the concentration of hydrochloric acid. The excitation temperature, the vibrational temperatures calculated from N 2 , OH, and NO bands, and the rotational temperatures determined from band of OH, N 2 and NO, were found to be dependent on these experimental parameters. The electron number density was determined from the Stark broadening of H b line. Additionally, the ionization temperature and degree were calculated using the Saha-Boltzmann equation, with the ion to atom ratio for magnesium (MgII/MgI). The results demonstrated that T exc (H), T vib (N 2 ), T vib (OH), T vib (NO) and T rot (OH) were well comparable (*3,800-4,200 K) for selected plasma generation conditions (gap C2.5 mm, HCl concentration C0.1 mol L -1 ), while the rotational temperatures determined from band of N 2 (*1,700-2,100 K) and band of NO (*3,000 K) were considerably lower. The electron number density was evaluated to be (3.4-6.8) 9 10 20 m -3 and the ionization temperature varied, throughout in the 4,900-5,200 K range.

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“…The spatial resolution along the discharge axis Z provided in this work is not sufficient to investigate the cathode region of the discharge where strong spatial gradients in Z-direction exist. Also, we should remember that work [7] put into evidence the filament structure of the cathode region of discharge of similar type. In our work, some measurements took an acquisition time of a few seconds.…”

Section: Measurement Resultsmentioning

confidence: 99%

A simple generator of a stationary flow of non-equilibrium atmospheric-pressure plasma

André¹,

Barinov²,

Faure³

et al. 2012

IOP Conf. Ser.: Mater. Sci. Eng.

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Discharge with liquid non-metallic electrodes P Andre, Yu Barinov, G Faure et al. -Experimental investigations of emission spectrum of a discharge with two liquid non-metallic (tap-water) electrodes in air at atmospheric pressure P Andre, Yu A Barinov, G Faure et al. Abstract. A simple design of a plasma discharge set up, providing a stationary flow of nonequilibrium atmospheric-pressure plasma is proposed. The non-equilibrium state of plasma is maintained by using a cathode with a weakly conducting liquid like tap water. The anode is formed with a cooled metal ring-shaped inserted in a dielectric barrel. This assembly is fixed at ~ 1 cm above the water surface. The velocity of the air flow through the anode hole may be changed from 0 m/s up to ~ 10 m/s. The studied discharge in the open air gap between the tap water surface and the anode ring is powered by direct current I ~ 0.1 A. The voltage on the air gap is ≥ 1 kV. Measurements of current-voltage characteristics at different flow velocities were carried out. Spectra of radiation of the discharge column and the torch above the anode were measured. The measurement results were compared with the results of radiation spectra modeling for non-equilibrium plasma of humid air. The comparison made possible to determine the characteristics of plasma. The characteristics of the plasma depending on the speed of the airflow and the current are studied.

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Characteristics of atmospheric pressure air discharges with a liquid cathode and a metal anode

Cited by 145 publications

References 31 publications

Anode pattern formation in atmospheric pressure air glow discharges with water anode

Anode pattern formation in atmospheric pressure air glow discharges with water anode

Spectroscopic Characterization of Miniaturized Atmospheric-Pressure dc Glow Discharge Generated in Contact with Flowing Small Size Liquid Cathode

A simple generator of a stationary flow of non-equilibrium atmospheric-pressure plasma

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