Mateusz Kamiński  This email address is being protected from spambots. You need JavaScript enabled to view it.1, Jakub M. Gac1, Piotr Sobiech2, Paweł Kozikowski2, Tomasz Jankowski2 

1 Faculty of Chemical and Process Engineering, Warsaw University of Technology, ul. Waryńskiego 1, 00-645 Warsaw, Poland
2 Central Institute for Labour Protection – National Research Institute, ul. Czerniakowska 16, 00-701 Warsaw, Poland


Received: January 24, 2022
Revised: March 25, 2022
Accepted: April 26, 2022

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.4209/aaqr.220039  


Cite this article:

Kamiński, M., Gac, J.M., Sobiech, P., Kozikowski, P., Jankowski, T. (2022). Mixture Aerosols Filtration on Filters with Wide Fibre Diameter Distribution - Comparison with Theoretical and Empirical Models. Aerosol Air Qual. Res. 22, 220039. https://doi.org/10.4209/aaqr.220039


HIGHLIGHTS

  • Impact of more accurate representation of fibre distribution.
  • Differences in predictions between theoretical and empirical models.
  • Changes of the average particle size downstream from the filter for mixture aerosol.
  • Differences in the average particle size for solid, liquid and mixture aerosols.
 

ABSTRACT


A methodology for calculating aerosol filtration efficiency using non-woven filters with polydispersity distribution of fibre diameters was formulated. In order to verify the results of the calculations experimentally, filters made of polypropylene non-woven fabric were used to filter solid (soot) and liquid (oil) aerosols and their mixtures with different concentrations. In order to increase the accuracy of the calculations, the division of the diameter distribution into several (1–100) ranges of values was considered. The influence of the number of these intervals for theoretical and empirical equations available in the literature was investigated. This effect was found to be significant, and replacing one diameter value representing all the fibres in the filter with twenty diameter ranges, each representing only a fraction of the total fibres, is sufficient to minimize the error due to the underrepresentation of the actual fibre distribution in the filter. Calculation of the mean particle size after the filter was performed using a set of theoretical and empirical equations. The calculations take into account the change in packing density, flow velocity and fibre diameter over time as a result of filling the filter with particles deposited on it. The obtained results were compared with the measurement results. It has been found that such changes in the monofilament performance model are insufficient to properly describe the effects inside the filter.


Keywords: Fibrous filters, Filter clogging, Filtration dynamics, Efficiency models, Mixture aerosols




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