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A mesoscale model for the relationship between efficiency and internal liquid distribution of droplet mist filters

Kolb, H.E.; Watzek, A.K.; Zaghini Francesconi, V.; Meyer, J.; Dittler, A.; Kasper, G.

Abstract (englisch):
Building on work by Kampa et al. (2014) about the liquid distribution in multi-layer oil mist filters, a mesoscale empirical model is proposed for their efficiency. It decomposes the total penetration into a product of independent ‘building blocks’ that are aligned with the mesoscale liquid distribution in steady state, essentially in the form of an oil film and a channel region. The film (typically one very thin region per sandwich) is associated with a film penetration Pfilm and the channel region (consisting typically of multiple layers) with a channel penetration Pchannel. The first layer of wettable media also represents a separate contribution P1st layer.
A method is described to derive these unit penetrations from a set of measurements. Experiments are then carried out with filters composed of conventional glass microfiber media, both wettable and non-wettable to compressor oil, in which the fractional penetration of the entire sandwich was measured by SMPS between about 30 and 700 nm. It is shown that the film penetration is substantially reduced for particles above about 100 nm in comparison to that of the dry media due to enhanced inertial deposition, while the channel penetration is generally higher across the board, probably because of a loss of active fiber in the partially saturated media. ... mehr



Originalveröffentlichung
DOI: 10.1016/j.jaerosci.2018.05.013
Scopus
Zitationen: 6
Web of Science
Zitationen: 6
Zugehörige Institution(en) am KIT Institut für Mechanische Verfahrenstechnik und Mechanik (MVM)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2018
Sprache Englisch
Identifikator ISSN: 0021-8502
KITopen-ID: 1000089959
Erschienen in Journal of aerosol science
Band 123
Seiten 219–230
Nachgewiesen in Web of Science
Scopus
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