Effect of the vortex formed by the electrohydrodynamic flow on the motion of particles in a needle-plate electrostatic precipitator

Wenchao Gao, Yifan Wang, Hao Zhang, Baoyu Guo, Chenghang Zheng, Jun Guo, Xiang Gao, Aibing Yu

Research output: Contribution to journalArticleResearchpeer-review

Abstract

This work numerically simulates the effect of the electrodynamic (EHD) flow on particle motion in a single-needle-plate electrode configuration. The interaction between the primary-secondary flow, and the trajectory of particles in a 3D environment is analyzed. In addition, the effects of the needle-shaped discharge electrode structure on the electric field and the flow field distribution are explored. The results show that the sharp tip of the needle emits a high-intensity discharge that generates a nearby high-speed ionic wind, which can reach a velocity of 9.028 m s–1 at an applied voltage and an inlet velocity of –60 kV and 1 m s–1, respectively. This ionic wind near the needle tip potentially increases the migration speed of particles. Moreover, 90% of the 1 µm particles penetrate the surface of the outlet, indicating that the EHD flow negatively affects the capture of fine particles. The relationships between the injection position, the residence time, and the escape velocity of the particles further confirm that the secondary flow significantly inhibits fine-particle capture. These findings can be applied to optimize an electrode design that efficiently uses high-speed ionic wind to capture particles, including the fine fraction.

Original languageEnglish
Pages (from-to)2911-2924
Number of pages14
JournalAerosol and Air Quality Research
Volume20
Issue number12
DOIs
Publication statusPublished - 2020

Keywords

  • Electrohydrodynamic flow
  • Electrostatic precipitator
  • Needle discharge electrode
  • Particle motion
  • Vortex

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