Details
| Original language | English |
|---|---|
| Pages (from-to) | 342-347 |
| Number of pages | 6 |
| Journal | Journal of membrane science |
| Volume | 423-424 |
| Publication status | Published - 5 Sept 2012 |
Abstract
This work aimed to study the enhancement of oxygen transfer rates in hollow fiber membrane contactors by applying Dean vortices. Systematic investigations of how the geometric parameters, like curve diameter, helical pitch or geometric shape, and flow rates affect the mass transport were done to assess the potential for membrane contactors. The membrane was a hydrophobic microfiltration hollow fiber (polypropylene). Helical, meander and twisted formed hollow fibers with fiber lengths from 5 to 30. cm and curvature diameters between 5 and 19. mm were constructed. The oxygen transfer rates per membrane area were investigated. The curved hollow fibers show a linear dependence between Dean number and enhancement factor and an increase of transfer rates up to an enhancement factor of 2.4. For the meander shaped fibers a critical Dean number/range between 10-20 was found, where the mass transport enhancement is adjusted rapidly to those of helical hollow fibers. Also the mass transfer in packed membrane modules was investigated, taking into account the theoretical packing densities of the different fiber geometries. It was found that a volumetric enhancement of gas transfer rates for helical and meander formed fibers can only be improved applying very small curvature diameters less than 4 mm.
Keywords
- Bubble-free aeration, Dean vortices, Gas-liquid contactor, Hollow fiber membrane module, Membrane gas absorption
ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology(all)
- Biochemistry
- Materials Science(all)
- Chemistry(all)
- Physical and Theoretical Chemistry
- Chemical Engineering(all)
- Filtration and Separation
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In: Journal of membrane science, Vol. 423-424, 05.09.2012, p. 342-347.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Generation of Dean vortices and enhancement of oxygen transfer rates in membrane contactors for different hollow fiber geometries
AU - Kaufhold, D.
AU - Kopf, F.
AU - Wolff, C.
AU - Beutel, S.
AU - Hilterhaus, L.
AU - Hoffmann, M.
AU - Scheper, T.
AU - Schlüter, M.
AU - Liese, A.
N1 - Funding information: This work is supported by the German Research Foundation (DFG), “Modulare Hohlfaserreaktoren in der Biotechnologie unter Berücksichtigung mikroskaliger Effekte” (DFG). The authors gratefully acknowledge this financial support.
PY - 2012/9/5
Y1 - 2012/9/5
N2 - This work aimed to study the enhancement of oxygen transfer rates in hollow fiber membrane contactors by applying Dean vortices. Systematic investigations of how the geometric parameters, like curve diameter, helical pitch or geometric shape, and flow rates affect the mass transport were done to assess the potential for membrane contactors. The membrane was a hydrophobic microfiltration hollow fiber (polypropylene). Helical, meander and twisted formed hollow fibers with fiber lengths from 5 to 30. cm and curvature diameters between 5 and 19. mm were constructed. The oxygen transfer rates per membrane area were investigated. The curved hollow fibers show a linear dependence between Dean number and enhancement factor and an increase of transfer rates up to an enhancement factor of 2.4. For the meander shaped fibers a critical Dean number/range between 10-20 was found, where the mass transport enhancement is adjusted rapidly to those of helical hollow fibers. Also the mass transfer in packed membrane modules was investigated, taking into account the theoretical packing densities of the different fiber geometries. It was found that a volumetric enhancement of gas transfer rates for helical and meander formed fibers can only be improved applying very small curvature diameters less than 4 mm.
AB - This work aimed to study the enhancement of oxygen transfer rates in hollow fiber membrane contactors by applying Dean vortices. Systematic investigations of how the geometric parameters, like curve diameter, helical pitch or geometric shape, and flow rates affect the mass transport were done to assess the potential for membrane contactors. The membrane was a hydrophobic microfiltration hollow fiber (polypropylene). Helical, meander and twisted formed hollow fibers with fiber lengths from 5 to 30. cm and curvature diameters between 5 and 19. mm were constructed. The oxygen transfer rates per membrane area were investigated. The curved hollow fibers show a linear dependence between Dean number and enhancement factor and an increase of transfer rates up to an enhancement factor of 2.4. For the meander shaped fibers a critical Dean number/range between 10-20 was found, where the mass transport enhancement is adjusted rapidly to those of helical hollow fibers. Also the mass transfer in packed membrane modules was investigated, taking into account the theoretical packing densities of the different fiber geometries. It was found that a volumetric enhancement of gas transfer rates for helical and meander formed fibers can only be improved applying very small curvature diameters less than 4 mm.
KW - Bubble-free aeration
KW - Dean vortices
KW - Gas-liquid contactor
KW - Hollow fiber membrane module
KW - Membrane gas absorption
UR - http://www.scopus.com/inward/record.url?scp=84867742591&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2012.08.035
DO - 10.1016/j.memsci.2012.08.035
M3 - Article
AN - SCOPUS:84867742591
VL - 423-424
SP - 342
EP - 347
JO - Journal of membrane science
JF - Journal of membrane science
SN - 0376-7388
ER -