Experimental Study on the Droplet Size and Charge-to-Mass Ratio of an Air-Assisted Electrostatic Nozzle

An air-assisted electrostatic nozzle uses a combination of air-assisted atomization and electrostatic spray technology. This article optimizes the existing air-assisted electrostatic nozzles in terms of structural design to obtain a higher charge-to-mass ratio and a smaller droplet size. The optimiz...

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Bibliographic Details
Published in:Agriculture (Basel) 2022-06, Vol.12 (6), p.889
Main Authors: Dai, Shiqun, Zhang, Jiayao, Jia, Weidong, Ou, Mingxiong, Zhou, Huitao, Dong, Xiang, Chen, Hong, Wang, Ming, Chen, Yu, Yang, Shuai
Format: Article
Language:English
Subjects:
Air flow
air-assisted electrostatic nozzle
Atomizing
charge-to-mass ratio
Data processing
droplet size
Droplets
Electric fields
Electric potential
Electrodes
Lasers
Mass ratios
Nozzles
Particle size
Pesticides
Pressure
Pressure effects
Stainless steel
Structural design
Structural engineering
Voltage
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Summary:An air-assisted electrostatic nozzle uses a combination of air-assisted atomization and electrostatic spray technology. This article optimizes the existing air-assisted electrostatic nozzles in terms of structural design to obtain a higher charge-to-mass ratio and a smaller droplet size. The optimized air-assisted electrostatic nozzle was studied experimentally, and the effects of liquid pressure, air pressure and applied voltage on the droplet size and charge-to-mass ratio were investigated. Comparing the effects of air pressure, liquid pressure and applied voltage on the charge-to-mass ratio and droplet size, the relationship curves of the droplet size and charge-to-mass ratio under each voltage were fitted using the Rayleigh charge limit theory. For a higher CMR during the spray operation, applied voltages between 2.5 kV and 3 kV, an air pressure between 0.4 bar and 0.6 bar, and a liquid pressure of less than 0.9 bar could be chosen. The optimized air-assisted electrostatic nozzles not only have small droplets but also have high charge-to-mass ratios, reducing the need for pesticide use and thus protecting human health and the environment.
ISSN:2077-0472
2077-0472
DOI:10.3390/agriculture12060889