Verification of slip flow in nanofiber filter media through pressure drop measurement at low-pressure conditions

Li Bao , Kazuya Seki , Hitoshi Niinuma , Yoshio Otani , Ratna Balgis , Takashi Ogi , Leon Gradoń , Kikuo Okuyama


Slip flow phenomena are of great concern in aerosol filtration because of their ability to develop low-pressure drops and high collection efficiency air filters by using nanofibers. However, it is a difficult task to verify the slip flow effect on the reduction in pressure drop because the inhomogeneity in fiber packing also results in a decrease in pressure drop. In the present work, we propose pressure drop measurements at low pressures to verify the slip flow effect by distinguishing the effects of filter inhomogeneity. We found that the experimental dimensionless drag at low-pressure conditions, which was obtained with correction by the inhomogeneity factor measured at atmospheric pressure, followed the theoretical prediction that includes the slip flow correction (Kirsch and Stechkina, 1978) for both conventional PTFE and newly developed fluororesin nanofiber filter media. Because the dimensionless drags of both nanofiber filters decreased inversely proportional to the Knudsen number, we concluded that these nanofiber filters have low-pressure drops because of slip flow effects.
Author Li Bao
Li Bao,,
, Kazuya Seki
Kazuya Seki,,
, Hitoshi Niinuma
Hitoshi Niinuma,,
, Yoshio Otani
Yoshio Otani,,
, Ratna Balgis
Ratna Balgis,,
, Takashi Ogi
Takashi Ogi,,
, Leon Gradoń (FCPE / CIPE)
Leon Gradoń,,
- Chair of Integrated Process Engineering
, Kikuo Okuyama
Kikuo Okuyama,,
Journal seriesSeparation and Purification Technology, ISSN 1383-5866
Issue year2016
Publication size in sheets0.5
Keywords in Englishfluororesin nanofiber filter media, pressure drop, slip flow, fiber packing inhomogeneity, low pressure condition
ASJC Classification1506 Filtration and Separation; 1602 Analytical Chemistry
Languageen angielski
Bao Li (i in.) - Verification of slip....pdf 1.96 MB
Score (nominal)40
Score sourcejournalList
ScoreMinisterial score = 40.0, 23-07-2020, ArticleFromJournal
Ministerial score (2013-2016) = 40.0, 23-07-2020, ArticleFromJournal
Publication indicators WoS Citations = 16; GS Citations = 35.0; Scopus SNIP (Source Normalised Impact per Paper): 2016 = 1.394; WoS Impact Factor: 2016 = 3.359 (2) - 2016=3.843 (5)
Citation count*38 (2020-08-31)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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