Measuring the inhomogeneities of high efficient glass fibrefilter media

Heidenreich, E.; Tittel, R.; Neuber, A.; Adam, Róbert

doi:10.1016/s0021-8502(05)80217-4

Cited by 7 publications

(5 citation statements)

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“…Reports of inhomogeneity of GFFs have been published. 32,33 Indeed, weights of 5-mm circles from GFFs were found to be variable in this work. Individual weights of 5-mm circles from GFFs from Gelman Sciences, Inc. varied by as much as 360 mg or 31% (average weight of 5-mm circles was 1.18 mg).…”

Section: Effect Of Inhomogeneity Of Gffs On the Equatorial Reagent Di...mentioning

confidence: 63%

Investigation of reagent distributions on glass fiber membrane filters used in air sampling

Tucker

2007

J. Environ. Monit.

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This project has arisen from the need to produce GFFs (glass fiber filters) bearing a thin and evenly distributed coating of a selected reagent in the equatorial plane for breakthrough studies. However, it has been discovered that today's two general techniques for coating GFFs (total immersion and application of reagent solution to GFFs) have usually produced unevenly distributed coatings of reagent in the equatorial plane. In addition, quantities of reagent on GFFs from commercial sources may vary widely in the same lot of coated GFFs. Consequences are variability in capacity of coated filters at the point of breakthrough and, perhaps, wasted reagent. Although today's reagent-coated filters may be satisfactory for routine air sampling, such filters may be unacceptable for precise breakthrough studies. Research has been conducted successfully to produce nearly evenly distributed coatings of reagents in the equatorial plane of GFFs by application of reagent solutions to the centers of GFFs which are resting on crisscrossing, fine, stainless-steel wire. Distributions of coatings have been determined by punching out twenty-one 5-mm circles from each GFF and analyzing each circle by flow-injection with a UV detector. Lowest achievable relative standard deviations of measurement (RSDs) for reagents in 5-mm circles have been 5 to 7%. Reagents studied have included 1-(2-pyridyl)piperazine (1-2PP), 2,4-dinitrophenylhydrazine (DNPH), and 1-(9-anthracenylmethyl)piperazine (MAP). Factors affecting the distribution of such coatings include choice of reagent and choice of solvent for the reagent solution.

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Section: Effect Of Inhomogeneity Of Gffs On the Equatorial Reagent Di...mentioning

confidence: 63%

Investigation of reagent distributions on glass fiber membrane filters used in air sampling

Tucker

2007

J. Environ. Monit.

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“…The packing density in each section is assumed to be uniform but different from that of the other sections. This parallel arrangement of two-dimensional variation in lter porosity relates to the experimental data on media packing density variation (Heidenreich et al 1991;Dhaniyala and Liu 1998).…”

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confidence: 67%

An Asymmetrical, Three-Dimensional Model for Fibrous Filters

Dhaniyala¹

1999

Aerosol Science and Technology

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ABSTRACT. The ow in a lter media represented by a three-dimensional ber arrangement has been modeled using a nite volume approach. This results in a better estimate of ber drag and accounts for some of the difference between theory and experimental results. In addition, the effect of inter ber distance and packing density distribution on drag characteristics is obtained numerically. An equivalent ber diameter based on the numerically obtained ber drag is compared with experimental values. The excellent agreement of numerical results with experimental values reveals the advantage of considering these media properties in modeling lter behavior. INTRODUCTIONThe important parameters in evaluating a lter media are pressure drop and particle collection ef ciency, and these parameters are dependent on the operating conditions and media properties such as ber size and packing density. Theoretical and numerical modeling of ow through the media is required to predict lter performance and enable design optimization. The lter media is represented by a simple structure, and the ow eld in this structure is used in calculating the lter characteristics. The accurate estimation of media performance requires an ideal representation of the real lter structure.The ow in a lter is generally in the low Reynolds number regime and follows Darcy's law (Davies 1973) with a linear dependence of pressure drop on face velocity. This is represented as:

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“…Forschungsprojekten grundsa ¨tzliche Probleme der Kuchenund Tiefenfiltration [2][3][4] und Zerkleinerung [5,6] bearbeitet. Zudem erfolgten Entwicklungen auf dem Gebiet der Partikelmesstechnik, u. a. die Einfu ¨hrung der Feinstkornpru ¨fsiebung als eine neue Analysenmethode zur Kennzeichnung feindisperser Partikelsysteme in den 1970er Jahren [7] sowie die eigensta ¨ndige Entwicklung von optischen Einzelpartikelza ¨hlern fu ¨r Flu ¨ssigkeiten nach dem Prinzip der (Weißlicht-)Extinktion [8], die seit 1985 als komplett rechnergestu ¨tzte Labormesssysteme in Kleinserie produziert wurden.…”

Section: Heidenreich Wurden Neben Vielen Industrienahenunclassified

“…Diese Anbindung der Partikelanalytik an die Technologie erwies sich als eine weitsichtige Entscheidung: Eine modellhafte Beschreibung partikeltechnologischer Prozesse gelingt nur bei Kenntnis der jeweils relevanten Änderungen des Dispersitätszustands und seiner Abhängigkeit von den Prozessparametern. In der Ära von Prof. Heidenreich wurden neben vielen industrienahen Forschungsprojekten grundsätzliche Probleme der Kuchen‐ und Tiefenfiltration 2–4 und Zerkleinerung 5, 6 bearbeitet. Zudem erfolgten Entwicklungen auf dem Gebiet der Partikelmesstechnik, u. a. die Einführung der Feinstkornprüfsiebung als eine neue Analysenmethode zur Kennzeichnung feindisperser Partikelsysteme in den 1970er Jahren 7 sowie die eigenständige Entwicklung von optischen Einzelpartikelzählern für Flüssigkeiten nach dem Prinzip der (Weißlicht‐)Extinktion 8, die seit 1985 als komplett rechnergestützte Labormesssysteme in Kleinserie produziert wurden.…”

Section: Professuren Und Arbeitsgruppenunclassified

70 Jahre Verfahrenstechnik an der TU Dresden

Beckmann,

Babick,

Eckert

et al. 2023

Chemie Ingenieur Technik

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An der Technischen Hochschule Dresden, der Vorgängereinrichtung der TU Dresden, wurde 1953 mit der Besetzung der Fachprofessur für Verfahrenstechnik eine Fachrichtung „Ingenieur für Verfahrenstechnik“ eingerichtet und das heutige Institut für Verfahrenstechnik und Umwelttechnik begründet. Seitdem wurde das Profil in Ausbildung und Forschung des Instituts innerhalb der Fakultät Maschinenwesen der Technische Universität Dresden (TUD) erheblich weiterentwickelt. Ausgehend von dieser Entwicklung werden die heutigen Forschungsschwerpunkte der fünf Professuren und Arbeitsgruppen vorgestellt.

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Measuring the inhomogeneities of high efficient glass fibrefilter media

Cited by 7 publications

References 0 publications

Investigation of reagent distributions on glass fiber membrane filters used in air sampling

Investigation of reagent distributions on glass fiber membrane filters used in air sampling

An Asymmetrical, Three-Dimensional Model for Fibrous Filters

70 Jahre Verfahrenstechnik an der TU Dresden

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