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Volume 7, No. 3, September 2007, Pages 343-352 PDF(296 KB)  
doi: 10.4209/aaqr.2007.03.0021   

Inertial Classification of Nanoparticles with Fibrous Filters

Yoshio Otani1, Kazunobu Eryu1, Masami Furuuchi1, Naoko Tajima2, Perapong Tekasakul3

1 Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan.
2 Kanomax Japan Inc., 2-1 Shimizu, Suita, Osaka 565-0805, Japan
3 Department of Mechanical Engineering, Faculty of Engineering Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand




This paper proposes a new concept for the utilization of fibrous filters for the classification of nanoparticles. The present work confirmed that the filter employed in the present work can separate particles smaller than 100 nm. The main conclusions obtained in the present work are as follows: (1) Inertial filter utilizes inertial impaction of particles and the classification performance can be predicted by the log penetration law and the single fiber collection efficiency, (2) 50% cutoff size is reduced by increasing the filtration velocity and is predicted by Stk50 = 1, (3) Inertial filter developed in the present work has a low pressure drop compared to a low pressure impactor and therefore the volatilization of volatile organic compounds is suppressed during the atmospheric aerosol sampling.



Keywords: Nanoparticles; Fibrous filters; Inertial filtration; High filtration velocity; Brownian diffusion.



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