The mechanism of corona discharge from a water droplet

Григорьев, А. И.; Shiryaeva, S. O.

doi:10.1007/bf00872157

Cited by 11 publications

(5 citation statements)

References 8 publications

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“…19 Indeed, it has been shown that the distortion of the electric field around water droplets is severe by calculating the field intensity around the circular water droplets in a uniform electric field. 20 In addition, due to the influence of water droplets on the distortion of the electric field in the air gap, the surfaces of the droplets exhibit field emission 21 and photoemission 14 phenomena. The energy required for surface field emissions and photoemissions by water droplets is 6.1 eV, which is much smaller than the ionization energy of water molecules.…”

Section: Resultsmentioning

confidence: 99%

“…21 Thus, it is easier to obtain electrons from water droplets rather than water molecules, so water droplets are an important source of streamers. According to theoretical calculations, 21 water droplets with diameters greater than 60 µm can be used as an important electronic source to further promote the development of a streamer. Thus, raindrop gaps have a lower breakdown voltage than air gaps.…”

Section: Resultsmentioning

confidence: 99%

“…The energy required for surface field emissions and photoemissions by water droplets is 6.1 eV, which is much smaller than the ionization energy of water molecules. 21 Thus, it is easier to obtain electrons from water droplets rather than water molecules, so water droplets are an important source of streamers. According to theoretical calculations, 21 water droplets with diameters greater than 60 mm can be used as an important electronic source to further promote the development of a streamer.…”

Section: Electric Insulating Mechanism For the Water Mistsmentioning

confidence: 99%

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Electrical safety of suppressing wildfires near high-voltage transmission lines using water mist

Lu¹,

Chen²,

Fang³

et al. 2018

Journal of Fire Sciences

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Wildfires near transmission lines are important disasters that affect power transmission. Water mist is a highly efficient method for suppressing wildfires near electrical transmission lines, where it avoids line-tripping to ensure the safety of the grid. However, few studies have investigated the electrical safety during the water mist extinguishing process, including the risk of tripping transmission lines and the shock hazard for users. In this study, we systematically studied the influence of the gap distance and the electric conductivity of the water solution on the insulation characteristics of water mist with a Dv 0.99 diameter of the droplets of ca. 500 mm, including the breakdown voltage and leakage current. Furthermore, we investigated the effect of water mist on the development of a long-gap discharge, and the insulation mechanism of water mist was also considered. Finally, water mist with multi-component additives was employed for suppressing wildfires near transmission lines in China, and we demonstrated the effectiveness of this method based on the reduction of line-tripping accidents caused by wildfires near transmission lines.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Electric Insulating Mechanism For the Water Mistsmentioning

confidence: 99%

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Electrical safety of suppressing wildfires near high-voltage transmission lines using water mist

Lu¹,

Chen²,

Fang³

et al. 2018

Journal of Fire Sciences

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“…These studies focus on the investigations of corona discharges from a water droplet in a point-to-plane gap [3] or on a conductor surface [4,5]. Later numerous works were carried out on the processes of discharges around a droplet surface [3,[6][7][8][9] or within a cloud of droplets [10][11][12]. These works pay close attention to the effects of composition [6,7], concentration [8] or conductivity [13,14] on the discharge around droplets.…”

Section: Introductionmentioning

confidence: 99%

An investigation on two-phase mixture discharges: the effects of macroparticle sizes

Deng¹,

He²,

Xu³

et al. 2010

J. Phys. D: Appl. Phys.

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A two-phase mixture (TPM) is a mixture of gas and macroparticles of high concentration, and there has been significant interest in many technical applications and natural phenomena concerning two-phase mixture discharges (TPMDs), but until now there has been no widely accepted analysis for the propagation of discharges in TPMs. In this paper, 21 kinds of different dielectric materials are used to investigate the effects on TPMD. The diameters of macroparticles in 21 kinds of TPMs are measured by microscope, laser particle size analyzer, etc, and the volume fractions are measured by a video camera and particle image velocimetry system. Based on a direct comparison of the breakdown voltages and the percentages of the discharge path in TPMs with those in air, this work reveals that whether TPMs promote the discharge development or not depends mainly on the macroparticle sizes. These macroparticles in TPMs distort the electric field, interact with ions, electrons or photons, and produce corresponding enhancements or decreases in ionization and excitation as the streamer front encounters them, but the details of alterations on the discharge development are highly correlated with the macroparticle sizes.

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“…The redistribution of electric charges takes place and charges are concentrated near the spheroid tops. As the result the dizintegration of the drop takes place with emitting of fine and strongly charged siblings [26].…”

Section: B Electrohydrodynamic Instability Of Charged Dropsmentioning

confidence: 99%

Electrohydrodynamic instability of charged drops at external affects

Bologa

Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on In

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Absfrracf-Electrohydrodynamic instability of charged droplets is the phenomenon observed when the electrostatic forces acting on the charged drop is large than the surface tension force. In the double phase gal-liquid system charged droplet is characterized by hydrogasodynamic and electrohydrodynamic instability. Aerodynamic forces and external electric field determine charged droplet geometry changing. It is shown that naturally charged droplets obviously do not reach their electrohydrodynamic instability. The influence of external affects on droplets charged in external electric field is analyzed. The process of heat and mass transfer in the double phase gas-liquid system is one of the main factor what influences on charged droplet electrohydrodynamic instability. The results of influence of liquid and gas temperature and pressure on charged droplet electrohydrodynamic instability are presented.Double phase unchargedcharged gas-liquid systems are widely used in different technological processes. They are working body in painting, printing, gas cleaning, separation condensation, evaporation and other processes, aerosols are used in heat exchanges for air cooling [1,2]. Liquid aero-

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The mechanism of corona discharge from a water droplet

Cited by 11 publications

References 8 publications

Electrical safety of suppressing wildfires near high-voltage transmission lines using water mist

Electrical safety of suppressing wildfires near high-voltage transmission lines using water mist

An investigation on two-phase mixture discharges: the effects of macroparticle sizes

Electrohydrodynamic instability of charged drops at external affects

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