Cheng-Hsiung Huang 1, Chuen-Jinn Tsai2

  • 1 Department of Environmental Engineering and Health, Yuanpei Institute of Science and Technology, No. 306 Yuanpei St., 300 Hsinchu, Taiwan, ROC
  • 2 Institute of Environmental Engineering, National Chiao Tung University, No, 75, Poai St., 300 Hsinchu, Taiwan, ROC

Received: May 31, 2002
Revised: May 31, 2002
Accepted: May 31, 2002
Download Citation: ||  

  • Download: PDF

Cite this article:
Huang, C.H. and Tsai, C.J. (2002). The Particle Collection Efficiency Curves by the Porous Substrate of an Inertial Impactor. Aerosol Air Qual. Res. 2: 1-8.



This work numerically studied particle collection efficiency curves as a function of aerodynamic particle diameter by the porous substrate of an inertial impactor. The simulation was conducted for different Reynolds numbers based on nozzle diameter (Re), resistance factors of porous substrate (K) and nozzle diameters of the inertial impactor (W). The results show that average flow velocity inside the porous substrate is low for a particle starting from the position close to the centerline leading to a small inertial force. The collection efficiency curves of the inertial impactor with porous substrate are less sharp for the case of higher Re and lower K than the case of lower Re and higher K. This phenomenon occurs because more air penetrates into the porous substrate when Re is large and K is small, resulting in higher particle collection efficiency. The cutoff aerodynamic diameter, dp50, of the impactor with porous substrate decreases with increasing Re, decreasing K and decreasing W. Ultrafine particle loss in the porous substrate can be important. For example, the particle loss of a three-stage cascade inertial impactor with porous substrate increases to 16.5% for particles with an aerodynamic diameter of 0.01 μm due to the diffusion mechanism when K = 568,000 cm-2 and Q = 2 L/min.

Keywords: Collection efficiency curve; Inertial impactor; Porous substrate

Share this article with your colleagues 


Subscribe to our Newsletter 

Aerosol and Air Quality Research has published over 2,000 peer-reviewed articles. Enter your email address to receive latest updates and research articles to your inbox every second week.

77st percentile
Powered by
   SCImago Journal & Country Rank

2022 Impact Factor: 4.0
5-Year Impact Factor: 3.4

Call for Papers for the special issue on: "Carbonaceous Aerosols in the Atmosphere"

Aerosol and Air Quality Research partners with Publons

CLOCKSS system has permission to ingest, preserve, and serve this Archival Unit
CLOCKSS system has permission to ingest, preserve, and serve this Archival Unit

Aerosol and Air Quality Research (AAQR) is an independently-run non-profit journal that promotes submissions of high-quality research and strives to be one of the leading aerosol and air quality open-access journals in the world. We use cookies on this website to personalize content to improve your user experience and analyze our traffic. By using this site you agree to its use of cookies.