Quantification of water in hydrophobic and hydrophilic flow channels subjected to gas purging via neutron imaging
SCIE
SCOPUS
- Title
- Quantification of water in hydrophobic and hydrophilic flow channels subjected to gas purging via neutron imaging
- Authors
- Tang, HY; Santamaria, A; Park, JW; Lee, C; Hwang, W
- Date Issued
- 2011-11-15
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- Water removal from an idle fuel cell is an important issue for start-up/shutdown down under cold temperature conditions. In our study, we performed an in-situ neutron imaging for a PEM fuel cell with bipolar plates, treated with a super-hydrophobic and super-hydrophilic coating on the flow channels. The coatings were applied to the channels but not on the landings in contact with the GDL. The cells were run at a constant voltage prior to shutdown, then sets of neutron images were taken with purge velocities varied from 1 m s(-1) to 4 m s(-1), in intervals of 1 m s(-1). It was found that changing the wettability of the flow channels can improve the dynamics of water removal during purging. The super-hydrophilic and super-hydrophobic coating had better performance in removing water on the landings and in the channels, respectively. Based on our test cells, we used the amount of water remaining as a metric and found no significant improvement by purging the cell at velocities greater than 3 m s(-1). (C) 2011 Elsevier B.V. All rights reserved.
- Keywords
- PEM; Fuel cell; Hydrophobicity; Water removal; Purging; PEM FUEL-CELL; DIFFUSION LAYER; DIAGNOSTIC-TOOLS; PART I; MANAGEMENT; TRANSPORT; VISUALIZATION; BEHAVIOR; REMOVAL; STACKS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/15867
- DOI
- 10.1016/J.JPOWSOUR.2011.05.057
- ISSN
- 0378-7753
- Article Type
- Article
- Citation
- JOURNAL OF POWER SOURCES, vol. 196, no. 22, page. 9373 - 9381, 2011-11-15
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- There are no files associated with this item.
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