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中南大学学报(英文版)

Journal of Central South University

Vol. 25    No. 11    November 2018

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Particle deposition in ventilation duct with convex or concave wall cavity
WANG Fei-fei(王飞飞)1, ZHANG En-shi(张恩实)1, XU Xin-hua(徐新华)1, WANG Jin-bo(王劲柏)1, MI Jian-chun(米建春)2

1. School of Environmental Science and Engineering, Huazhong University of Science and Technology,Wuhan 430074, China;
2. College of Engineering, Peking University, Beijing 100871, China

Abstract:A numerical study is carried out on particle deposition in ducts with either convex or concave wall cavity. Results show that, if compared with smooth duct, particle deposition velocities increase greatly in ducts with wall cavities. More specifically, for τ+<1, increase by about 2–4 orders of magnitude in the cases with the convex and concave wall cavities; for τ+>1, grows relatively slower. Enhancement of particle deposition with wall cavities is caused by the following mechanisms, i.e., interception by the wall cavities, expanded deposition area, and the enhanced flow turbulence. In general, addition of wall cavities is contributive for particle deposition, so it provides an efficient approach to remove particles, especially with small size, e.g., PM2.5. Moreover, the convex wall cavity leads to a larger increment of than the concave wall cavity. However, taking pressure loss into account, though is relatively lower, duct with the concave wall cavity is more efficient than that with the convex wall cavity.

 

Key words: numerical simulation; ventilation duct; particle deposition; deposition velocity

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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