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Bubbly flow mapping in the anode channel of a direct methanol fuel cell via PIV investigation

Author

Listed:
  • Calabriso, Andrea
  • Borello, Domenico
  • Romano, Giovanni Paolo
  • Cedola, Luca
  • Del Zotto, Luca
  • Santori, Simone Giovanni

Abstract

Fuel cells directly fed by liquid methanol represent a class of suitable devices supplying small portable power applications. However some issues must be properly addressed and resolved, before considering them a market attractive technology. The presence of gaseous CO2 generated in the anode channels is the main issue as it can hinder the free volume of the Gas Diffusion Layer (GDL) reducing the methanol flux through the porous media towards the catalyst layer. Here the influence of the gas phase on the cell performance is investigated as well as the relationship with operating parameters, such as air flow rate, methanol–water flow rate and current density. We noticed that higher anodic flow rates can determine energy waste (the utilization factor of the cell can become very low). On the other hand, lower flow rates usually result in generation of gas slugs remaining attached over the GDL surface or slowly moving in the channels. This phenomenon reduces the residence time of the liquid phase and affects the mass transport of methanol towards the Catalyst Layer (CL). The V/I curve, for flow rates lower than 3.4mlmin−1cm−2, results to be lower at high current density, where the main cause of losses is the concentration polarization. The study was performed by micro-PIV and it helped to verify the effective temporary clogging of the anode channel when working in controlled conditions. The characteristics of the CO2 bubbles in the two-phase flow at low flow rate regimes in a square channel were investigated and the mapping of different bubbly flows was carried out.

Suggested Citation

  • Calabriso, Andrea & Borello, Domenico & Romano, Giovanni Paolo & Cedola, Luca & Del Zotto, Luca & Santori, Simone Giovanni, 2017. "Bubbly flow mapping in the anode channel of a direct methanol fuel cell via PIV investigation," Applied Energy, Elsevier, vol. 185(P2), pages 1245-1255.
    • Handle: RePEc:eee:appene:v:185:y:2017:i:p2:p:1245-1255
    DOI: 10.1016/j.apenergy.2016.01.042
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    1. Yuan, Wei & Wang, Aoyu & Ye, Guangzhao & Pan, Baoyou & Tang, Kairui & Chen, Haimu, 2017. "Dynamic relationship between the CO2 gas bubble behavior and the pressure drop characteristics in the anode flow field of an active liquid-feed direct methanol fuel cell," Applied Energy, Elsevier, vol. 188(C), pages 431-443.
    2. Chen, Jingxian & Xu, Peihang & Lu, Jie & Ouyang, Tiancheng & Mo, Chunlan, 2021. "A prospective study of anti-vibration mechanism of microfluidic fuel cell via novel two-phase flow model," Energy, Elsevier, vol. 218(C).
    3. Chen, Xueye & Li, Tiechuan & Shen, Jienan & Hu, Zengliang, 2017. "From structures, packaging to application: A system-level review for micro direct methanol fuel cell," Renewable and Sustainable Energy Reviews, Elsevier, vol. 80(C), pages 669-678.
    4. Ke, Yuzhi & Zhang, Baotong & Bai, Yafeng & Yuan, Wei & Li, Jinguang & Liu, Ziang & Su, Xiaoqing & Zhang, Shiwei & Ding, Xinrui & Wan, Zhenping & Tang, Yong & Zhou, Feikun, 2023. "Bubble-derived contour regeneration of flow channel by in situ tracking for direct methanol fuel cells," Energy, Elsevier, vol. 264(C).

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    Keywords

    DMFC; Methanol; CO2 bubbles; Fuel cell;
    All these keywords.

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