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

Sang Kun Lee, Kohei Ito

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

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.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume161
Issue number1
DOIs
Publication statusPublished - Jan 1 2014

Fingerprint

gaseous diffusion
Diffusion in gases
gas flow
Flow of gases
separators
Separators
Visualization
drainage
Drainage
surface layers
transparence
touch
Water
channel flow
Channel flow
pressure drop
water
Contact angle
Pressure drop
adhesion

All Science Journal Classification (ASJC) codes

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

Cite this

Cross-sectional visualization and analysis of droplet behavior in gas flow channel in PEFC. / Lee, Sang Kun; Ito, Kohei.

In: Journal of the Electrochemical Society, Vol. 161, No. 1, 01.01.2014.

Research output: Contribution to journalArticle

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