Scaling factors for channel width variations in tree-like flow field patterns for polymer electrolyte membrane fuel cells - An experimental study
International Journal of Hydrogen Energy, ISSN: 0360-3199, Vol: 46, Issue: 37, Page: 19554-19568
2021
- 23Citations
- 14Captures
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Article Description
To have a uniform distribution of reactants is an advantage to a fuel cell. We report results for such a distributor with tree-like flow field plates (FFP). Numerical simulations have shown that the width scaling parameters of tree-like patterns in FFPs used in polymer electrolyte membrane fuel cells (PEMFC) reduces the viscous dissipation in the channels. In this study, experimental investigations were conducted on a 2-layer FF plate possessing a tree-like FF pattern which was CNC milled on high-quality graphite. Three FF designs of different width scaling parameters were employed. I–V curves, power curves and impedance spectra were generated at 70%, 60% and 50% relative humidity (25 cm 2 active area), and compared to those obtained from a conventional 1-channel serpentine FF. It was found that the FF design, with a width scaling factor of 0.917 in the inlet and 0.925 in the outlet pattern, exhibited the best peak power out of the three designs (only 11% - 0.08 W/cm 2 lower than reference serpentine FF). Results showed that a reduction of the viscous dissipation in the flow pattern was not directly linked to a PEMFC performance increase. It was found that water accumulation, together with a slight increase in single PEMFC resistance, were the main reasons for the reduced power density. As further improvements, a reduction of the number of branching generation levels and width scaling factor were recommended.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0360319921010132; http://dx.doi.org/10.1016/j.ijhydene.2021.03.102; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85104432880&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0360319921010132; https://api.elsevier.com/content/article/PII:S0360319921010132?httpAccept=text/xml; https://api.elsevier.com/content/article/PII:S0360319921010132?httpAccept=text/plain; https://dul.usage.elsevier.com/doi/; https://dx.doi.org/10.1016/j.ijhydene.2021.03.102
Elsevier BV
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