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Efficient Corona Discharge Fog Collector: Multiple Mesh Electrodes with Electric Field Enhances Fog Harvesting

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Abstract

Collecting fog water from the atmosphere or industrial waste gas can not only replenish water resources, but also improve the atmospheric environment. However, the efficiency of the traditional fog mesh collector is not satisfactory. Different to inefficient fog meshes, collecting droplets by corona discharge is a potential method that can effectively improve the collection efficiency of fog. This research proposes an electrostatic fog collector using multiple mesh droplet collecting electrodes with an electric field, which realizes the efficient collection of fog. The electrostatic fog collector consists of three parts: charged electrode, multiple mesh collecting electrodes and resistor divider. The influence of mesh size, the number of the mesh electrodes, and the electric field on the collecting rate are all studied experimentally. The experimental results show that the collection efficiency of the electrostatic fog collector using 5 collecting electrodes with electric field is as high as 82%. Under the action of the electric field, the power consumption of the electrostatic fog collector is only increased by 1.06 times, but the collection efficiency of each mesh droplet collecting electrode is increased by 4 ~ 5 times. In addition, the mesh size selection strategy is studied, and the optimal mesh size scheme is also discussed.

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Abbreviations

η a :

Aerodynamic efficiency

η d :

Deposition efficiency

η ds :

Saturated deposition efficiency

A in :

Collection area of the mesh wires

A 0 :

Cross-sectional area of the mesh wires

α :

Experimental constant

K e :

The ratio of electric field force to viscous force

R d :

The radius of the droplet

R w :

The radius of the mesh wire

L :

The distance between the high-voltage electrode and the first droplet collecting electrode

ε 0 :

Vacuum dielectric constant

μ :

Air viscosity

V :

Applied voltage

v :

Droplet velocity

v 0 :

Initial velocity of the droplet

v 1 :

Airflow speed

F e :

Electric field force

F d :

Drag force

F r :

Air resistance

m :

Mass of fog droplet

E :

Electric field

q s :

Saturation charge of the fog droplet

t :

Droplet movement time

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Acknowledgements

This work is supported by The National Key Research and Development Program of China under Grant 2016YFC0401002 and Grant 2016YFC0401006, and the National Natural Science Foundation of China under Grant 51577080 and Grant 51821005.

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Correspondence to Chuan Li.

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Dingchen Li, Chuan Li, Jiawei Li, Wendi Yang, Menghan Xiao, Ming Zhang, Yong Yang and Kexun Yu declare that they have no conflict of interest or financial conflicts to disclose.

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Li, D., Li, C., Li, J. et al. Efficient Corona Discharge Fog Collector: Multiple Mesh Electrodes with Electric Field Enhances Fog Harvesting. Plasma Chem Plasma Process 42, 1249–1264 (2022). https://doi.org/10.1007/s11090-022-10279-7

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