In-situ visualization and structure optimization of the flow channel of proton exchange membrane fuel cells

IF 2.6 4区 工程技术 Q3 ENERGY & FUELS Frontiers in Energy Research Pub Date : 2024-09-11 DOI:10.3389/fenrg.2024.1454007
Zhengguo Qin, Yuanyuan Liu, Chasen Tongsh, Zhiming Bao, Hongtao Li, Kangcheng Wu, Zhe Deng, Bowen Qin, Qing Du, Kui Jiao
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Abstract

The flow field serves as an important component of proton exchange membrane fuel cells (PEMFCs) for maintaining the hydration of the membrane and discharge of excessive water. In this study, a transparent polycarbonate plate was used as the cathode end plate of the PEMFC. The water management capacity of the PEMFCs with different cathode flow fields was evaluated. The movement and evolution patterns of water droplets, film, and columns in different flow fields were analyzed. The results show that liquid water is discharged faster as the cross-section of the flow channel becomes smaller. The performance of the PEMFC with a partially-narrowed flow field is higher due to better water management capacity and forced convection of gas reactant. Liquid water exists mostly in the form of liquid columns in the parallel flow channel, damaging the uniformity of gas distribution. The wavy flow field is likely to be flooded due to the difference of water movement velocity in different channel regions. In addition, a volume of fluid (VOF) model was developed to quantitatively evaluate the water management performance of each type of flow field. The water movement patterns in the different flow channels were concluded. This study provided real-time observations of water movement in the flow channel, revealing a correlation between water management capabilities and the performance of the PEMFC.
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质子交换膜燃料电池流道的原位可视化和结构优化
流场是质子交换膜燃料电池(PEMFC)的重要组成部分,用于维持膜的水合作用和排出过量的水。本研究使用透明聚碳酸酯板作为质子交换膜燃料电池的阴极端板。对不同阴极流场的 PEMFC 的水管理能力进行了评估。分析了水滴、水膜和水柱在不同流场中的运动和演变模式。结果表明,随着流道横截面的变小,液态水的排出速度加快。由于更好的水管理能力和气体反应物的强制对流,流场部分变窄的 PEMFC 性能更高。液态水主要以液柱形式存在于平行流道中,破坏了气体分布的均匀性。由于水在不同流道区域的运动速度不同,波浪形流场很可能被淹没。此外,还建立了流体体积(VOF)模型来定量评估每种流场的水管理性能。并总结了不同流道的水流运动模式。这项研究提供了流道中水运动的实时观测结果,揭示了水管理能力与 PEMFC 性能之间的相关性。
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来源期刊
Frontiers in Energy Research
Frontiers in Energy Research Economics, Econometrics and Finance-Economics and Econometrics
CiteScore
3.90
自引率
11.80%
发文量
1727
审稿时长
12 weeks
期刊介绍: Frontiers in Energy Research makes use of the unique Frontiers platform for open-access publishing and research networking for scientists, which provides an equal opportunity to seek, share and create knowledge. The mission of Frontiers is to place publishing back in the hands of working scientists and to promote an interactive, fair, and efficient review process. Articles are peer-reviewed according to the Frontiers review guidelines, which evaluate manuscripts on objective editorial criteria
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