AAAR 34th Annual Conference
October 12 - October 16, 2015
Hyatt Regency
Minneapolis, Minnesota, USA
Abstract View
Modeling of Nanoparticle Penetration through Electret Filter Media
DREW THOMPSON, Sheng-Chieh Chen, Deqiang Chang, Min Tang, David Y. H. Pui, University of Minnesota
Abstract Number: 690 Working Group: Control Technology
Abstract Single fiber efficiencies for electret filter media with circular cross-section and bipolar surface charge distribution were calculated for combined mechanical and electrostatic collection mechanisms. The electrostatic interactions considered were Coulombic, polarization, and image forces. Single fiber efficiency was assumed to be the product of independent deterministic mechanisms (e.g., interception, Coulombic, polarization, and image forces) and stochastic mechanisms (i.e., diffusion). Deterministic efficiencies were calculated from the particle flux between limiting trajectories of inertialess particles which were solved numerical using an explicit Runge-Kutta formula. Diffusional efficiency was determined using an empirical power law relation. Model results were compared to experimental results obtained which isolated mechanical, Coulombic, and polarization collection mechanisms through control of particle charge state and/or discharging of the electret media.