Particle Collection of Electret Media under Different Filtration Pressures

Zhen Liu; Da-Ren Chen; Qinghe Niu; Desmond Asiedu Mensah; Zhongli Ji

doi:10.4209/aaqr.220405

Particle Collection of Electret Media under Different Filtration Pressures

Special issue in honor of Prof. David Y.H. Pui for his “50 Years of Contribution in Aerosol Science and Technology” (I)

Zhen Liu^1,2, Da-Ren Chen This email address is being protected from spambots. You need JavaScript enabled to view it.², Qinghe Niu¹, Desmond Asiedu Mensah¹, Zhongli Ji¹

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¹Beijing Key Laboratory of Process Fluid Filtration and Separation, College of Mechanical and Transportation Engineering, China University of Petroleum, Beijing 102249, China
²Particle Laboratory, Department of Mechanical & Nuclear Engineering, Virginia Commonwealth University, Richmond, VA 23284, USA

Received: November 20, 2022
Revised: January 1, 2023
Accepted: January 3, 2023

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.220405

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Cite this article:

Liu, Z., Chen, D.R., Niu, Q., Mensah, D.A., Ji, Z. (2023). Particle Collection of Electret Media under Different Filtration Pressures. Aerosol Air Qual. Res. 23, 220405. https://doi.org/10.4209/aaqr.220405

HIGHLIGHTS

Filtration pressure effect on the electret media filtration performance was observed.
The adverse pressure effect was obvious at a positive filtration pressure.
A revised model including the pressure effect on electret filter performance was proposed.

ABSTRACT

Electret media have the advantage of enhancing the particle collection efficiency while keeping/reducing the media pressure drop by the electrostatic mechanisms in addition to the mechanical ones. This study investigated the effect of operational pressure on the filtration performance of electret filter media. Experiments was conducted at the pressures in the range of 0.33–3 atm and using DMA-classified particles ranging in electrical mobility sizes of 10–600 nm. The penetration of particles in the neutral, singly charged and Fuchs’ bipolar charge states of two electret media (both charged and discharged) were measured. The single fiber efficiency due to the induced and Coulombic forces, i.e., η_In and η_C, were obtained. It is found that both efficiencies are a function of the filtration pressure (i.e., fiber Kn#) in addition to those parameters already included in existing models. A simple modification was also proposed for the existing model (based on the single fiber theory), enabling it to predict the particle collection efficiency of electret media operated under various filtration pressures.

Keywords: Electret media, Charged fibrous media, Filtration pressure, Aerosol filtration, Particle penetration