Multi-mechanism theory of aerosol capture by fibrous filters, including fiber diameter/orientation dispersity and particle morphology effects. Preliminary tests vs. data for mobility-selected submicron particles

Rosner, Daniel E. y Arias-Zugasti, Manuel . (2022) Multi-mechanism theory of aerosol capture by fibrous filters, including fiber diameter/orientation dispersity and particle morphology effects. Preliminary tests vs. data for mobility-selected submicron particles. Journal of Aerosol Science, 164 (2022) 106000

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Título Multi-mechanism theory of aerosol capture by fibrous filters, including fiber diameter/orientation dispersity and particle morphology effects. Preliminary tests vs. data for mobility-selected submicron particles
Autor(es) Rosner, Daniel E.
Arias-Zugasti, Manuel
Materia(s) Física
Abstract In Paper I (Sep. Purif. Technol. 257 (2021) 117676) we showed that a semi-analytic, multi-mechanism expression for the single-fiber capture fraction, cap,SF, (derived using asymptotically valid approximations: Ref < 0.4, Pef 1, R 1, R·Pe1/3 f arbitrary and Stkp Stkpcrit), facilitates a deterministic-, pseudo-continuum aerosol population-balance (PB-) approach to predicting fibrous filter performance. There we explicitly considered “deep” (Lf/df,g 1), low solidity idealized fibrous filters (FFs) challenged by polydispersed aerosols—especially single-mode log-normal (LN) ASDs of modest spread captured by a spatially uniform array of fibers of a single diameter in crossflow. However, realistic fibrous filter media often possess a LN distribution of fiber diameters, as well as a near-Gaussian orientation distribution narrowly spread about normal incidence ( = /2). Moreover, even if this were not so, there would be meso-scale departures from a uniform average fiber solid fraction. We show here that our tractable aerosol PBE-approach to idealized FF performance (Paper I) can be generalized to incorporate these particular structural features of commercially available fibrous filter media. But, to clarify whether these generalizations are likely to be useful, if not fully sufficient, for practical circumstances, it is also necessary to compare such methods/predictions against selected sets of well-defined experimental results. We initiate this program here, having chosen the recent experiments of Kang et al. (Sep. Purif. Technol. 209 (2019) 461–469) carried out using a commercially available fiberglass filter with Lf/df,g ' 300, mean solid fraction of 0.039, and df,g = 2.5 μm, successively challenged by mobility-selected KCl(s) particles (with diameters between ca. 20 and 600 nm) at the carrier gas velocities of 15 and 10 cm/s—capture conditions dominated by the transport mechanism of Brownian diffusion and convection, with “interception” (associated with non-negligible dp/df ) becoming important above ca. dp = 100 nm. We conclude from these data that the effective interception diameter, dp,icpt,eff, of the particles studied is systematically larger than their stated mobility diameters—a situation which will deserve further attention in future studies. Encouraged by these preliminary but instructive comparisons, we expect that, for many current and future design purposes, our present class of semi-analytic/non-stochastic/multi-mechanism methods will provide a welcome complement, if not alternative, to much more computationally-intensive simulation methods for realistic fibrous media that have been described and implemented in the recent aerosol filtration literature. The consequences of including these structural features of fibrous filters in the presence of aerosol size- and shape polydispersity will be the subject of future studies, based on the generalized Population Balance Equation developed/proposed in Section 3.3.
Palabras clave fibrous filter aerosol capture theory
aerosol deposition (multi-mechanism) on fibers
fiber diam
orientation and mesoscale nonuniformity
interception particle diam
mobility particle diam
sub-critical particle inertia effects on fibrous filter performance
Editor(es) Elsevier
Fecha 2022-04-09
Formato application/pdf
Identificador bibliuned:DptoFMyF-FCIE-Articulos-Marias-0001
http://e-spacio.uned.es/fez/view/bibliuned:DptoFMyF-FCIE-Articulos-Marias-0001
DOI - identifier https://doi.org/10.1016/j.jaerosci.2022.106000
ISSN - identifier 0021-8502
Nombre de la revista Journal of Aerosol Science
Número de Volumen 164
Publicado en la Revista Journal of Aerosol Science, 164 (2022) 106000
Idioma eng
Versión de la publicación acceptedVersion
Tipo de recurso Article
Derechos de acceso y licencia http://creativecommons.org/licenses/by-nc-nd/4.0
info:eu-repo/semantics/openAccess
Tipo de acceso Acceso abierto
Notas adicionales This is the Accepted Manuscript of an article published by ELSEVIER in "Journal of Aerosol Science" on 25 April 2022, available online: https://doi.org/10.1016/j.jaerosci.2022.106000
Notas adicionales Este es el manuscrito aceptado de un artículo publicado por ELSEVIER en "Journal of Aerosol Science" el 25 abril 2022, disponible en línea: https://doi.org/10.1016/j.jaerosci.2022.106000

 
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Creado: Thu, 26 May 2022, 18:56:16 CET