期刊
CHEMICAL ENGINEERING JOURNAL
卷 429, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131974
关键词
Proton exchange membrane fuel cell; Micro-flow field; Bipolar plate; Droplet dynamics; Relative humidity
资金
- Plan of National Key Research and Development [2018YFB1502505]
- National Natural Science Foundation [22179099]
Micro-flow field in PEM fuel cells can increase maximum power density and self-humidification capability, while potentially eliminating the need for humidification equipment in auxiliary systems.
Micro-flow field is a preeminent stratagem for improving Proton exchange membrane fuel cells (PEMFC) output performance. Elucidating the droplet dynamics behavior in the micro-channel and its impact on water management is essential. This work has investigated that, for the same radius droplets, the maximum driving pressure difference of droplets will increase by 560% approximately in micro-channel due to the matched characteristic dimension through theoretical analysis based on the fluid mechanics model. The micro-flow field (0.5mm x 0.5mm channel) in PEMFC can promote the maximum power density by about 48% compared to the normal-flow field (1mm x 1mm channel) in PEMFC by experiments under the same operating conditions and membrane electrode assembly. Simultaneously, PEMFC with the micro-flow field can obtain the most excellent performance without humidifying the air. Its self-humidification characteristic makes it possible to cancel the humidification equipment in the auxiliary system in the future.
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