Wenchao Gao1, Yifan Wang2, Hao Zhang2, Baoyu Guo1, Chenghang Zheng2, Jun Guo3, Xiang Gao This email address is being protected from spambots. You need JavaScript enabled to view it.2, Aibing Yu1,4

1 ARC Research Hub for Computational Particle Technology, Department of Chemical Engineering, Monash University, Victoria 3800, Australia
2 State Key Lab of Clean Energy Utilization, State Environmental Protection Engineering Center for Coal-Fired Air Pollution Control, Zhejiang University, Hangzhou 310027, China
3 Fujian Longking Co., Ltd., Longyan 364000, China
4 Southeast University-Monash University Joint Research Institute, Suzhou Industrial Park, Jiangsu 215100, China


 

Received: April 16, 2020
Revised: July 2, 2020
Accepted: July 19, 2020

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.4209/aaqr.2020.04.0152 

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Cite this article:

Gao, W., Wang, Y., Zhang, H., Guo, B., Zheng, C., Guo, J., Gao, X. and Yu. A. (2020). Effect of the Vortex Formed by Electrohydrodynamic Flow on the Motion Behavior of Particles in a Needle-plate Electrostatic Precipitator. Aerosol Air Qual. Res. https://doi.org/10.4209/aaqr.2020.04.0152


HIGHLIGHTS

  • Needle discharge electrode was used in this simulation work.
  • The effects of EHD flow on flow field were studied numerically.
  • The effects of ionic wind on particle motion behavior were studied.
 

ABSTRACT


In this work, the effect of electrodynamic flow (EHD) on particle motion behavior is studied numerically on the basis of the single needle–plate electrode configuration. The interaction between primary–secondary flow and the trajectory of particles in a 3D environment is presented. In addition, the effects of the needle-shaped discharge electrode structure on the electric field and the flow field distribution are explored. Results show that the sharp surface of the needle tip causes high-intensity discharge that creates high-speed ion wind near this tip. The maximum velocity of the ionic wind can reach 9.028 m/s at applied voltage and inlet velocity of −60 kV and 1 m/s, respectively. This high-speed ion wind generated near the needle tip can increase the migration speed of particle. Moreover, the phenomenon that 90% of 1 µm particles penetrate the outlet surface indicates that the EHD flow negatively affects the capture of fine particles. The relationship among the injection position, residence time, and escape velocity of the particles further confirms that secondary flow seriously affects fine-particle capture. These results can help improve and optimize an electrode structure that reasonably uses high-speed ion wind to capture particles and prevent fine particles from escaping.


Keywords: Electrostatic precipitator; Electrohydrodynamic flow; Needle discharge electrode; Vortex; Particle motion.



Aerosol Air Qual. Res. 20:-. https://doi.org/10.4209/aaqr.2020.04.0152 


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