Please use this identifier to cite or link to this item:
|Title:||Observation of flow characteristics in a hollow fiber lumen using non-invasive X-ray microimaging (XMI)|
Hollow fiber membrane
|Citation:||Chang, S., Yeo, A., Fane, A., Cholewa, M., Ping, Y., Moser, H. (2007-10-01). Observation of flow characteristics in a hollow fiber lumen using non-invasive X-ray microimaging (XMI). Journal of Membrane Science 304 (1-2) : 181-189. ScholarBank@NUS Repository. https://doi.org/10.1016/j.memsci.2007.07.037|
|Abstract:||This paper reports non-invasive observations of flow characteristics inside a hollow fiber membrane lumen under suction conditions using X-ray microimaging (XMI) techniques. The observation revealed that for hydrophobic polypropylene (PP) hollow fiber membranes, bubbles, ranging in size from about 50 to 200 μm existed in some local regions of the fiber lumen. An in situ suction pressure monitor revealed that the presence of the bubbles inside the fiber lumen caused considerable fluctuations in the transmembrane pressure during the filtration. The XMI observation identified two types of bubbles, stagnant and mobile. The stagnant bubbles, whose shape changed with increasing suction pressure, eventually reached a stable geometry of a semi-sphere with a flat bottom. These bubbles were observed to stick firmly to some local regions of the fiber lumen. Contact angle analysis shows that the existence of the stagnant bubble could be related to the hydrophobicity of the local region. The mobile bubbles were observed to grow and detach from the wall under suction conditions, indicating a possible role of cavitation in the filtration with hollow fiber membranes. A crevice model was used to explain the formation of the nuclei for cavitation on the fiber internal surface. In addition, this study also confirmed that X-ray microimaging is a useful tool for non-invasive observation of two-phase flow phenomenon inside fiber lumens. © 2007 Elsevier B.V. All rights reserved.|
|Source Title:||Journal of Membrane Science|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Sep 19, 2018
WEB OF SCIENCETM
checked on Sep 19, 2018
checked on Sep 21, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.