EHD atomization characteristics of a point-plate system with a porous point electrode

Jung, Jae-Seung; Moon, Jae-Duk; Kim, Jin-Gyu; Geum, Sang-Taek

doi:10.1016/j.elstat.2009.07.003

Cited by 7 publications

(2 citation statements)

References 22 publications

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“…When the local electric eld intensity exceeds the ionization eld intensity of the gas, the gas will be ionized and excited, so the corona discharge will appear near the end face of atomization [31]. The negative ions in the ionized gas move toward the positive side.…”

Section: Particle Size Analysismentioning

confidence: 99%

Investigation of electrostatic-assisted ultrasonic atomization and spraying

Yang,

Yuan,

Zhang

et al. 2024

Int J Adv Manuf Technol

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Ultrasonic atomization technology has been widely used in industry in recent years due to its higher atomization e ciency. This paper proposes a method of electrostatic-assisted ultrasonic atomization spraying and designs a special ultrasonic power supply that can directly introduce high-voltage static electricity onto the surface of the ultrasonic atomization so that the liquid can contact the charge and enhance the charging effect. This paper conducts numerical simulation analysis on the atomization process and statistically analyzes the numerical simulation atomization particle size through image processing. In addition, this paper designs experiments from two aspects of atomization particle size and lm-forming effect. The results show that the experimental results are consistent with the numerical simulation results, verifying the accuracy of the numerical simulation results. It shows that in the process of sub-droplet formation, the introduction of static electricity will increase the number of capillary waves, promote two mechanisms of the capillary pinch-off mechanism and the Rayleigh-Plain instability, reduce atomization particle size, and increase atomization e ciency. Compared with the traditional air ow beam method, the lm-forming surface quality of the electric eld beam method is higher and the surface roughness is lower. It solves the problem that air ow affects lm-forming quality in traditional ultrasonic spraying with the air ow beam method. It provides a theoretical basis and scienti c guidance for the application of electrostatic-assisted ultrasonic atomization technology in the atomization and lm preparation industry.

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Section: Particle Size Analysismentioning

confidence: 99%

Investigation of electrostatic-assisted ultrasonic atomization and spraying

Yang,

Yuan,

Zhang

et al. 2024

Int J Adv Manuf Technol

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“…It can be supposed that in the case the liquid jet is stabilized, the authors observed only the glow corona discharge, while other forms of gaseous discharges could only destabilize the electrospraying. When the glow corona is generated, an increase in supply voltage may not cause jet instabilities, but only causes an increase in discharge current and discharge brightness, until the voltage magnitude at which the breakdown occurs (Zeleny 1914, Phan-Cong et al 1974, Bailey and Borzabadi 1978, Ogata et al 1978, Barber and Swift 1982, Meesters et al 1992, Cloupeau and Prunet-Foch 1994, Tang and Gomez 1995, Borra et al 1996, Jaworek and Krupa 1997, Ku and Kim 2002, Stommel et al 2006, Korkut et al 2008, Jung et al 2009, Kim et al 2011, Jaworek et al 2014, Pongrac et al 2014a. The stabilizing effect occurs because an increase in the electric field reduces the tip radius of the cone meniscus and the diameter of the jet.…”

Section: Electrospray-corona Studiesmentioning

confidence: 99%

Low temperature plasmas and electrosprays

Jaworek¹,

Gañán‐Calvo²,

Machala³

2019

J. Phys. D: Appl. Phys.

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The paper reviews the state of the art in the field of interaction of low temperature plasmas generated during electrospraying with the liquid cone and jet. Many studies are focused at practical applications of electrospraying, for example to mass spectrometry, electrospinning of nanofibers, thin film deposition, nanoparticle production, ink-jet printing, etc, but the phenomenon of electrically generated plasma due to gas ionization accompanying the electrospraying is frequently ignored. The effect of electrical discharge on the electrospraying process depends on the type of the discharge. When glow corona or onset streamers are generated, the electrospray is stabilized in the classical cone-jet mode, however, for breakdown streamers, sparks, or arc discharges, the electrospraying process is disturbed and irregular modes (spindle, multispindle or ramified jet) occur. The electrospray-discharge interaction phenomena have been studied by photographic recording, electric current measurements, mass spectrometry and optical emission spectroscopy. Some studies show that the current carried by the ions generated in this plasma and flowing through the drift region to the opposite electrode can be higher than the current carried by the electrosprayed droplets. This effect has been proved by separation of both currents using a specially designed device. To prevent the distortion of the electrospray process, various strategies have been developed: modification of the electric field in the vicinity of capillary nozzle, stabilization of the glow corona, reduction of the surface tension of liquid. Recently, the physical processes and phenomena occurring in electrical discharge plasmas during electrospraying of liquids find new application in decontamination of liquids or in material processing. The advantage of the coupled electrospray-plasma process is that the liquid atomization is combined with plasma chemical processes within the same device, by using the same power supply applied to the capillary nozzle.

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