碩士 / 國立中央大學 / 能源工程研究所 / 96 / The purpose of this study is to investigate the effect of flow field design on the performance of PEMFC with fixed open ratio flow fields. Gore 5621 is used in this work. Experiments include the visualization of the droplets formation from cell reaction, effects of cathode flow rate on the water formation and transport, and the transient response of the cell to sudden load change.
The results show that the location of droplet formation and water distribution are different for the various types of flow field designs. The double inter-digitated flow field (DIFF) has the most uniform water distribution and best cell performance among the three flow field designs. For cell temperature of 60oC and humidification temperature of 90oC, cell performances of all three flow fields are enhanced by increasing the cathode flow rate. For low cell temperature cases, cathodic humidification increases cell performance for serpentine flow field (SFF) and DIFF, but not for the interdigitated flow field (IFF). For the transient analysis, results show that DIFF has better current gain but longer response time.
In summary, the cell performance of DIFF is the best of the three flow field designs due to more uniform reactant gas distribution and the convective mass transfer effect.
| Identifer | oai:union.ndltd.org:TW/096NCU05399007 |
| Date | January 2008 |
| Creators | Chung-po Chen, 陳柏春 |
| Contributors | Chung-jen Tseng, 曾重仁 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 109 |
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