Analytical approach to calculate the nanoparticle filtration efficiency of polydisperse and nanofibrous filters

T. Schuldt*, F. Schmidt, University Duisburg-Essen; C. Asbach, Institute of Energy and Environmental Technology e.V. (IUTA), Germany

In the last years many studies (e.g. projects of the “NanoCare-Cluster”) have shown that ultrafine particles (less than 100 nm in diameter) and nanoparticles can be harmful for human health, especially if they are inhaled. Adverse effects of such particles also play a significant role in technical processes like the clean production of semiconductor devices. Therefore the filtration of these airborne particles is both of health and of commercial interest.

Several analytical and numerical approaches exist to calculate the filtration efficiency. Commonly the so called single fiber theory is used. In the case of nanoparticles, diffusion is the dominating transport mechanism, whereas impaction can usually be neglected. This reduces the variety of empirical equations typically used in the literature.

In this study we calculate the efficiencies of filters with nanofibers, comparing different equations. In addition we examined what happens if in the calculation the traditional approach of using one average fiber diameter is replaced by a polydisperse fiber diameter distribution. The results are compared with experimental data by Hung and Leung (2011)....

Session: G6 - Nanofibre Filter Media
Day: 14 March 2018
Time: 10:45 - 12:00 h

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