Cross-sectional visualization and analysis of droplet behavior in gas flow channel in PEFC

Sang Kun Lee, Kohei Ito

研究成果: Contribution to journalArticle

12 引用 (Scopus)

抜粋

A new cross-sectional visualization cell in which a transparent material is not embedded in the separator was developed to observe water droplet behavior in a flow channel and to analyze the impact of the channel and gas diffusion layer (GDL) surface on the behavior. A specific GDL and separator pair was chosen so that the surface of the GDL was more hydrophobic than that of the separator, where the contact angle difference between them was approximately 27°. With this GDL and separator pair, a droplet formed in the channel does not touch the GDL surface. This specific pair also makes the droplet smaller and causes less of a pressure drop through the channel, leading to superior drainage from the channel. A theoretical analysis based on the force balance surrounding a droplet explains this superior drainage. The reason is that the combination of the hydrophobic GDL and hydrophilic separator reduces the adhesion force on the droplet, promoting water drainage.

元の言語英語
ページ(範囲)F58-F66
ジャーナルJournal of the Electrochemical Society
161
発行部数1
DOI
出版物ステータス出版済み - 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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