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On the accuracy of capillary flow porometry for fibrous filter media

Kolb, H. E.; Schmitt, R.; Dittler, A.; Kasper, G.

Abstract (englisch):
The application of capillary flow porometry by gas-liquid displacement to the measurement of the pore size distribution in identical glass microfiber filter media can lead to surprisingly divergent results. The causes for these differences as well as the factors that influence the over-all reliability of data obtained by this widely used technique are investigated. Among the key factors studied were the volatility and viscosity of four common wetting liquids, the scan rate (i.e. the holding time between increments of differential pressure Δp or volumetric flowrate V̇ ), and the scan sequence (i.e. dry before wet, or wet before dry scan). Most measurements were made with a porometer designed in house, in order to have complete control over all aspects of operation. Data obtained with commercial porometers are also reported. For best comparability, all measurements were made with the same batch of standard glass microfiber media.
The largest error source by far was the volatility of fluorinated compounds commonly used as wetting liquids. While the vapor pressures of such compounds may be relatively low, their use in combination with a flow of air through the porous matrix can have an enormous effect on the evaporation rate during a scan. ... mehr

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Postprint §
DOI: 10.5445/IR/1000080393
Veröffentlicht am 01.02.2019
DOI: 10.1016/j.seppur.2018.01.024
Zitationen: 4
Web of Science
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mechanische Verfahrenstechnik und Mechanik (MVM)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 30.06.2018
Sprache Englisch
Identifikator ISSN: 1383-5866, 1873-3794
KITopen-ID: 1000080393
Erschienen in Separation and purification technology
Band 199
Seiten 198-205
Vorab online veröffentlicht am 31.01.2018
Nachgewiesen in Web of Science
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