Influence of Humidity on Clogging of Flat and Pleated HEPA Filters.
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| Title: | Influence of Humidity on Clogging of Flat and Pleated HEPA Filters. |
|---|---|
| Authors: | Joubert, A.1, Laborde, J. C.2, Bouilloux, L.2, Calle-Chazelet, S.3, Thomas, D.3 |
| Source: | Aerosol Science & Technology. Dec2010, Vol. 44 Issue 12, p1065-1076. 12p. |
| Subjects: | Humidity, Air filters, Dispersion (Chemistry), Aerosols, Fluorescein, Particulate matter, Cake filters, Nanoparticles |
| Abstract: | The influence of humidity on changes to the pressure drop of flat and pleated HEPA filters clogged by polydisperse hygroscopic and non-hygroscopic aerosols has been studied. For flat filters, the results confirm the observations reported by Gupta et al. (1993) that with a hygroscopic aerosol at humidity below the deliquescent point, or with a non-hygroscopic aerosol, the particulate specific cake resistance decreases as relative humidity increases. For pleated filters as for flat filters, the results reveal that during the formation of the particulate cake, the increase in relative humidity leads to a decrease in the specific cake resistance. When the reduction in filtration area, specific to pleated filters, becomes large, the presence of humidity accelerates the filling of pleats causing a greater pressure drop for a same aerosol mass loading. With a hygroscopic aerosol at a humidity above its deliquescent point, the change in pressure drop through flat or pleated filters is not linear but characteristic of liquid aerosol filtration. The influence of humidity on the efficiency of pleated filters, measured by a soda fluorescein aerosol, has also been studied. For clean filters, the efficiency decreases with increasing relative humidity above 90%. For filters clogged with solid aerosol, change in efficiency versus collected surface mass reaches a maximum whose value depends on the relative humidity; when the aerosol is liquid, the efficiency decreases throughout the clogging. [ABSTRACT FROM AUTHOR] |
| Copyright of Aerosol Science & Technology is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 53921333 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Influence of Humidity on Clogging of Flat and Pleated HEPA Filters. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Joubert%2C+A%2E%22">Joubert, A.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Laborde%2C+J%2E+C%2E%22">Laborde, J. C.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Bouilloux%2C+L%2E%22">Bouilloux, L.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Calle-Chazelet%2C+S%2E%22">Calle-Chazelet, S.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Thomas%2C+D%2E%22">Thomas, D.</searchLink><relatesTo>3</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Aerosol+Science+%26+Technology%22">Aerosol Science & Technology</searchLink>. Dec2010, Vol. 44 Issue 12, p1065-1076. 12p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Humidity%22">Humidity</searchLink><br /><searchLink fieldCode="DE" term="%22Air+filters%22">Air filters</searchLink><br /><searchLink fieldCode="DE" term="%22Dispersion+%28Chemistry%29%22">Dispersion (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Aerosols%22">Aerosols</searchLink><br /><searchLink fieldCode="DE" term="%22Fluorescein%22">Fluorescein</searchLink><br /><searchLink fieldCode="DE" term="%22Particulate+matter%22">Particulate matter</searchLink><br /><searchLink fieldCode="DE" term="%22Cake+filters%22">Cake filters</searchLink><br /><searchLink fieldCode="DE" term="%22Nanoparticles%22">Nanoparticles</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The influence of humidity on changes to the pressure drop of flat and pleated HEPA filters clogged by polydisperse hygroscopic and non-hygroscopic aerosols has been studied. For flat filters, the results confirm the observations reported by Gupta et al. (1993) that with a hygroscopic aerosol at humidity below the deliquescent point, or with a non-hygroscopic aerosol, the particulate specific cake resistance decreases as relative humidity increases. For pleated filters as for flat filters, the results reveal that during the formation of the particulate cake, the increase in relative humidity leads to a decrease in the specific cake resistance. When the reduction in filtration area, specific to pleated filters, becomes large, the presence of humidity accelerates the filling of pleats causing a greater pressure drop for a same aerosol mass loading. With a hygroscopic aerosol at a humidity above its deliquescent point, the change in pressure drop through flat or pleated filters is not linear but characteristic of liquid aerosol filtration. The influence of humidity on the efficiency of pleated filters, measured by a soda fluorescein aerosol, has also been studied. For clean filters, the efficiency decreases with increasing relative humidity above 90%. For filters clogged with solid aerosol, change in efficiency versus collected surface mass reaches a maximum whose value depends on the relative humidity; when the aerosol is liquid, the efficiency decreases throughout the clogging. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Aerosol Science & Technology is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1080/02786826.2010.510154 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 12 StartPage: 1065 Subjects: – SubjectFull: Humidity Type: general – SubjectFull: Air filters Type: general – SubjectFull: Dispersion (Chemistry) Type: general – SubjectFull: Aerosols Type: general – SubjectFull: Fluorescein Type: general – SubjectFull: Particulate matter Type: general – SubjectFull: Cake filters Type: general – SubjectFull: Nanoparticles Type: general Titles: – TitleFull: Influence of Humidity on Clogging of Flat and Pleated HEPA Filters. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Joubert, A. – PersonEntity: Name: NameFull: Laborde, J. C. – PersonEntity: Name: NameFull: Bouilloux, L. – PersonEntity: Name: NameFull: Calle-Chazelet, S. – PersonEntity: Name: NameFull: Thomas, D. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 12 Text: Dec2010 Type: published Y: 2010 Identifiers: – Type: issn-print Value: 02786826 Numbering: – Type: volume Value: 44 – Type: issue Value: 12 Titles: – TitleFull: Aerosol Science & Technology Type: main |
| ResultId | 1 |
