Corona Discharge-Induced Rain and Snow Formation in Air

Yang, Yong; Tan, Xiao; Liu, Dawei; Lü, Xinpei; Zhao, Chun; Lu, Jiazheng; Pan, Yuan

doi:10.1109/tps.2018.2820200

Cited by 33 publications

(23 citation statements)

References 23 publications

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“…It is hard to form such a high electric field strength (more than 3×10 6 V/m) and the required density of charged particles in a large space of field experiments. By contrast, Yang Y et al [19] detected the growth of raindrops and the formation of snowflakes in the relative open air. They expounded how the size of droplet evolves in the process of falling to the ground.…”

Section: Introductionmentioning

confidence: 94%

Electrostatic Effects of Corona Discharge on the Spectrum and Density Evolution of Water Droplets in Air

Wang

et al. 2020

IEEE Access

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As one of the emerging application areas of the corona discharge technique, rain enhancement induced by atmospheric air ionization has made a great breakthrough. Although natural rainfall modified by artificial ionization was successfully observed via the statistical data of field experiments, deficient efforts have been devoted to the research on the near-field effect of corona discharge on the evolution of water droplets around the discharge device. In this paper, we studied the electrostatic effects of corona discharge on the spectrum and density evolution of water droplets in a 96-m 3 cloud chamber. An interesting phenomenon was found that two different electrostatic effects appeared when various high voltages were applied on the corona electrode. In detail, the growth of droplets larger than 10 μm was detected once the applied high voltage exceeds the critical value (e.g.-80 kV in our discharge device), and this is attributed to the electrostatic induction effect. By contrast, a narrow droplet size spectrum and reduced density caused by the strong electrostatic precipitation effect were shown below this critical voltage. To figure out the mechanisms underlying these phenomena, the charging status of water droplets with various sizes, forces of charged droplets under various electric field strength, and collision kernels between droplets, are analyzed through theoretical calculations. Results show that the electric field plays a dominant role in the charging process of droplets and the acceleration of collision-coalescence between charged and neutral droplets, which results in the different electrostatic effects on the evolution of droplets. This paper may provide some enlightenment to fog elimination in industrial application and cloudseeding in atmospheric water resources comprehensive utilization.

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Section: Introductionmentioning

confidence: 94%

Electrostatic Effects of Corona Discharge on the Spectrum and Density Evolution of Water Droplets in Air

Wang

et al. 2020

IEEE Access

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“…The collision rate R T considers the effects of the electrical, phoretic, and diffusive forces. [ 21–24 ] R T is calculated by,

R_{T} = \frac{4 π B_{p} C}{exp (B_{p} C / D_{p} f_{p} A) - 1},

where B p is the mobility of the particles; D p is their diffusion coefficient, f p is a ventilation coefficient to account for the increase in diffusive flux due to the droplet moving through the air, and C is the sum of constants for the nondiffusive forces, that is., C = C e (electrical force) + C Th (thermophoretic force) + C Df (diffusophoretic force), where the constants on the right‐hand side are proportional to the inverse square electrical, thermophoretic, and diffusophoretic forces, respectively. [ 25,26 ]…”

Section: Experiments Setup and Numerical Modelmentioning

confidence: 99%

Deposition of charged aerosols by E × B enhanced low‐temperature plasma jet array

Chen

Huang

Liu

2021

Plasma Processes & Polymers

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In this paper, an efficient plasma jet array based on the E × B enhancement was developed. The direction of the magnetic field was the same as the propagation direction of the plasma jet, and the direction of the electric field was perpendicular to the plasma jet. The E × B enhancement increased the length of the plasma jet from 0.5 to 1.8 cm, the discharge current peak by 37.8%, and the plasma power by 11.1%, compared with the control case. Three‐dimensional simulation of electrons movement indicates that the confinement of electrons in the high argon concentration region was the main reason for the E × B enhancement. The stronger discharge based on the E × B enhancement increased the ion density in the open air significantly. The charged aerosols were generated through the diffusion charging mechanism. The image charge electric force between charged and neutral aerosols increased the collision rate between aerosols, therefore, the larger aerosols were generated, and 108% more deposition of aerosols than the natural settlement case were achieved.

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“…The charged aerosols have a polarizing effect on other neutral water molecule clusters so that the nucleation of the cloud droplets and ice crystals will be accelerated over what would happen naturally. In a water-saturated condition, these cloud droplets and ice crystals will eventually grow until they are large enough to fall to the ground, leading to precipitation in the target area [23,24].…”

Section: Principle and Seeding Procedures Of The Ion-based Rain Enhancementmentioning

confidence: 99%

Evaluation of the First Negative Ion-Based Cloud Seeding and Rain Enhancement Trial in China

Zheng

Zhang

et al. 2021

Water

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Negative ion-based cloud seeding has been shown to be an effective means in the laboratory. China’s first negative ion-based cloud seeding outfield trial was conducted in the northwestern interior. This paper briefly introduces the principle of the ion-based precipitation enhancement, and the trial location is described. The design of the ionization system and meteorological monitoring network are presented. The implementation plan of the outfield trial is explained. In addition, the evaluation of experimental effects is detailed in this paper. We designed various analytical methods to investigate both the overall precipitation variation of the experimental area and the precipitation variation within the experimental area. The overall precipitation of the experimental area was predicted using a neural network, and then the actual precipitation was compared with the predicted precipitation to evaluate the effectiveness of the experiment. The effectiveness of the experiment was also evaluated using historical precipitation data and the result of the randomized comparative trial. This paper also explores the effects of geographic location differences and wind direction differences on the precipitation differences within the trial area. The changes in the number of negative ions and clouds in the sky were also analyzed. From these analyses, we obtained quantitative assessment results. These results could indicate that the outfield trial basically met the expected requirements, which is to increase the rainfall of the trial area by 20%.

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Corona Discharge-Induced Rain and Snow Formation in Air

Cited by 33 publications

References 23 publications

Electrostatic Effects of Corona Discharge on the Spectrum and Density Evolution of Water Droplets in Air

Electrostatic Effects of Corona Discharge on the Spectrum and Density Evolution of Water Droplets in Air

Deposition of charged aerosols by E × B enhanced low‐temperature plasma jet array

Evaluation of the First Negative Ion-Based Cloud Seeding and Rain Enhancement Trial in China

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