TY - JOUR
T1 - Effect of the vortex formed by the electrohydrodynamic flow on the motion of particles in a needle-plate electrostatic precipitator
AU - Gao, Wenchao
AU - Wang, Yifan
AU - Zhang, Hao
AU - Guo, Baoyu
AU - Zheng, Chenghang
AU - Guo, Jun
AU - Gao, Xiang
AU - Yu, Aibing
PY - 2020
Y1 - 2020
N2 - 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.
AB - 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.
KW - Electrohydrodynamic flow
KW - Electrostatic precipitator
KW - Needle discharge electrode
KW - Particle motion
KW - Vortex
UR - http://www.scopus.com/inward/record.url?scp=85098509813&partnerID=8YFLogxK
U2 - 10.4209/aaqr.2020.04.0152
DO - 10.4209/aaqr.2020.04.0152
M3 - Article
AN - SCOPUS:85098509813
SN - 1680-8584
VL - 20
SP - 2911
EP - 2924
JO - Aerosol and Air Quality Research
JF - Aerosol and Air Quality Research
IS - 12
ER -