A Model of Aerosol Penetration through Fibrous Filters with Pinholes.

• YAMADA Yuji

  Division of Radiotoxicology, National Institute of Radiological Sciences

• KOIZUMI Akira

  Division of Radiotoxicology, National Institute of Radiological Sciences

• MIYAMOTO Katsuhiro

  Division of Radiotoxicology, National Institute of Radiological Sciences

Bibliographic Information

Other Title

• 繊維層フィルタのピンホールに対する粒子透過モデル

Abstract

Aerosol penetrations through fibrous filters with pinholes were studied theoretically and experimentally. An equivalent thin filter layer (ETFL) model assuming a virtual filter layer was proposed to account for penetration through filters with pinholes. From one to thirty pinholes per filter were made on HEPA filter media using columnar pins of 0.195, 0.150 or 0.130 mm in diameter. Aerosol penetration through these filters was measured using monodisperse NaCl aerosols ranging from 0.05 to 0.3 μm in diameter at air flow face velocities of 0.00775, 0.0233 and 0.0698 m/s. Net penetration through the pinholes increased in proportion to the pinhole number and size. But there was no change in pressure drops across the filters. As a result of analysis based on the ETFL model, the layer thickness was estimated to range from 1/5 to 1/12 of the normal filter thickness. The predicted penetration curves were confirmed to agree well with the measured curves.

Journal

• Earozoru Kenkyu

  Earozoru Kenkyu 11 (1), 35-43, 1996

  Japan Association of Aerosol Science and Technology

Keywords

• Pinhole
• Fibrous Filter
• Penetration
• Model
• Virtual Filter Layer

Details

• CRID: 1390282679318788480
• NII Article ID: 10002686906
• NII Book ID: AN10041511
• DOI: 10.11203/jar.11.35
• ISSN: 1881543X
• ISSN: 09122834
• Text Lang: en
• Data Source:
  • JaLC
  • CiNii Articles
  • Crossref
• Abstract License Flag: Disallowed