2024 journal article

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Microscale modelling of electret filters using disordered 2-D domains

POWDER TECHNOLOGY, 431.

By: S. Atri  ⁿ, A. Kumar  ⁿ, S. Gautam  ⁿ, H. Tafreshi ⁿ  & B. Pourdeyhimi ^*

author keywords: Aerosol filtration; Bipolar fiber; CFD simulation; Electrostatic efficiency; Particle capture; Dipole orientation

topics (OpenAlex): Aerosol Filtration and Electrostatic Precipitation; High voltage insulation and dielectric phenomena; Lattice Boltzmann Simulation Studies

10.1016/j.powtec.2023.119094

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UN Sustainable Development Goal Categories

6. Clean Water and Sanitation (Web of Science)

Source: Web Of Science

Added: December 4, 2023

This paper reports on a computational study about the impact of fiber dipole orientation on particle collection efficiency of a bipolarly charged filter. The simulations were carried out using ANSYS software in a series of 2-D geometries comprised of randomly distributed fibers. The simulations were enhanced with in-house subroutines to incorporate Coulomb and dielectrophoretic forces in calculating particle trajectories and thereby simulating filter efficiency. The highest and lowest efficiencies were observed for dipole orientations that were perpendicular and parallel to the airflow direction, respectively. The simulation results were also compared with the predictions of the popular semi-empirical correlations from the literature and good general agreement was observed, without the need for any empirical correction factors. In addition, it was observed that the predictions of the semi-empirical correlations better agreed with the simulation results obtained for media comprised of fibers with random dipole orientations when challenged with neutralized particles.