Technique for the introduction into the atmosphere of high concentrations of electrically charged aerosol particles

Vonnegut, B.; Smallman, C.R.; Harris, C.K.; Sykes, Wendell G.

doi:10.1016/0021-9169(67)90044-x

Cited by 12 publications

(5 citation statements)

References 3 publications

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“…Under certain conditions a corona discharge sensibly enhances the efficiency of electrostatic filters, thus providing a high degree of cleaning [347,348]. However, electrostatic filters are not efficient in capturing microparticles with dimensions ranging between 0.6 ÷ 1.6 µm.…”

Section: Applications: the Electrodynamic Trap With Corona Dischargementioning

confidence: 99%

The physics and applications of strongly coupled plasmas levitated in electrodynamic traps

Mihalcea¹,

Филинов²,

Syrovatka³

et al. 2019

Preprint

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Charged (nano)particles confined in electrodynamic traps can evolve into strongly correlated Coulomb systems, which are the subject of current investigation. Exciting physical phenomena associated to Coulomb systems have been reported such as autowave generation, phase transitions, system self-locking at the ends of the linear Paul trap, self-organization in layers, or pattern formation and scaling. The dynamics of ordered structures consisting of highly nonideal similarly charged nanoparticles, with coupling parameter of the order Γ = 10 8 is investigated. This approach enables us to study the interaction of nanoparticle structures in presence and in absence of the neutralizing plasma background, as well as to investigate various types of phenomena and physical forces these structures experience. Applications of electrodynamic levitation for mass spectrometry, including containment and study of single aerosols and nanoparticles are reviewed, with an emphasis on state of the art experiments and techniques, as well as future trends. Late experimental data suggest that inelastic scattering can be successfully applied to the detection of biological particles such as pollen, bacteria, aerosols, traces of explosives or synthetic polymers.

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Section: Applications: the Electrodynamic Trap With Corona Dischargementioning

confidence: 99%

The physics and applications of strongly coupled plasmas levitated in electrodynamic traps

Mihalcea¹,

Филинов²,

Syrovatka³

et al. 2019

Preprint

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“…From then on, the technologies of artificial releasing ions and charged particles from the ground into the atmosphere were used for weather modification. In 1961 and 1967, Vonnegut et al [8,9] introduced charges into the atmosphere successfully to change the fair-weather electric field by installing a line electrode negative high voltage corona discharge device and a charged aerosol generating device on the coast. The experiment results of [10][11][12] showed that the release of ions could even modify the electrical conditions in clouds.…”

Section: Introductionmentioning

confidence: 99%

Density enhancement of nano-sized and submicron-sized water droplets induced by charges released from corona discharge

Wang¹,

Li²,

Zhang³

et al. 2020

J. Phys. D: Appl. Phys.

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Corona discharge is widely used as an ionization source in field experiments of weather modification induced by charged particles due to its high efficiency and economy. However, deficient research efforts have been devoted to the effects of corona discharge on the size distribution and evolution of droplets in the humid air. In this paper, the characteristic of water droplets spectrum evolution in humid air with unipolar corona discharge is studied by an electrical low pressure impactor (ELPI) experiment in a 96 m 3 cloud chamber. Results show that nano-sized water droplets with diameters from 9 nm to 25 nm grow rapidly because of the inducement of charges released from corona discharge. Additionally, an increase in the concentration of submicron droplets appears at 20 min. To reveal the potential mechanism of the phenomena, the average charge values of charged droplets measured by ELPI are further analyzed. Meanwhile, the relationship between saturated vapor pressure over charged droplet's surface and its radius is discussed by the modified Kelvin-Thomson equation. Results show that, for the density enhancement of nano-sized droplets, condensational growth induced by charges released from corona discharge dominates significantly. The subsequent increase in the density of submicron-sized droplets is regarded as the break-up of the micron-sized droplets, with the process of evaporation when droplets are approaching the Rayleigh limit in the sub-saturated environment. This research may bring some new perspectives to further study of weather modification and cloud-seeding induced by charged particles, such as by increasing condensed nuclei density, broadening cloud droplets spectrum, and suppressing the evaporation of cloud droplets, etc.

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“…In this model, the interaction force between microparticle and trap electrodes (2) depends on the following combination of the parameters Φ p = Uqp 2 ln( R2 R1 ) , so the results of the computations depend on it, rather than separately on the microparticle charge, the electrode voltage or geometry of the trap. For the simulation we have used a microparticle with mass density ρ p = 3990 kg/cm 3 .…”

Section: Mathematical Simulation Of Charged Microparticle Dynamics In...mentioning

confidence: 99%

“…For example, in electrostatic filters microparticles gain charge in the corona discharge and then are accumulated by the electrodes [1]. Under certain conditions, electrostatic filters with the corona discharge provide a high degree of cleaning [2,3]. However, electrostatic filters are not efficient in capturing microparticles with sizes of 0.6-1.6 microns.…”

mentioning

confidence: 99%

Confinement of the charged microparticles by alternating electric fields in a gas flow

Lapitsky¹,

Филинов²,

Vasilyak³

et al. 2015

EPL

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This paper presents the simulation and experimental results of charged microparticles dynamics in electrodynamic traps in a gas flow at atmospheric pressure. For the first time the capture and confinement of charged microparticles in a linear Paul trap has been experimentally confirmed at atmospheric pressure in gas flows. The regions of the microparticle, linear Paul trap and gas flow parameters needed for microparticle confinement have been obtained and experimentally tested.

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Technique for the introduction into the atmosphere of high concentrations of electrically charged aerosol particles

Cited by 12 publications

References 3 publications

The physics and applications of strongly coupled plasmas levitated in electrodynamic traps

The physics and applications of strongly coupled plasmas levitated in electrodynamic traps

Density enhancement of nano-sized and submicron-sized water droplets induced by charges released from corona discharge

Confinement of the charged microparticles by alternating electric fields in a gas flow

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