Analytical model of flow maldistribution in polymer electrolyte fuel cell channels

Suman Basu, Chao Yang Wang, Ken S. Chen

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Gas-liquid, two-phase flow through channels of a polymer electrolyte fuel cell (PEFC) is of great interest as reactant oxygen is supplied and liquid product water is removed via these PEFC channels. Gas diffusion layer (GDL) intrusion in the channels, which is inherent to the process of PEFC cell and stack assembling, increases the local flow resistance in the intruded channels and consequently lowers their flowrates. This flow maldistribution renders the intruded channels more susceptible to liquid water accumulation or flooding. A one-dimensional analytical model is developed in this work to elucidate the two-phase flow maldistribution in PEFC channels resulting from GDL intrusion. Relative humidity (RH) and the stoichiometric flow ratio of inlet gases are found to be the two key parameters controlling the flow maldistribution in PEFC channels. Interestingly, our analysis shows that decreasing the inlet RH worsens flow maldistribution. As GDL intrusion in channels is inevitable, a good flow-field design must be inherently tolerable to flow maldistribution. Using the analytical model presented herein, the number of flow channels and their U-turns are optimized to minimize the detrimental effect of GDL intrusion.

Original languageEnglish (US)
Pages (from-to)6145-6154
Number of pages10
JournalChemical Engineering Science
Volume65
Issue number23
DOIs
StatePublished - Dec 1 2010

Fingerprint

Diffusion in gases
Electrolytes
Fuel cells
Analytical models
Polymers
Two phase flow
Atmospheric humidity
Liquids
Gases
Water
Channel flow
Flow fields
Oxygen

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

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abstract = "Gas-liquid, two-phase flow through channels of a polymer electrolyte fuel cell (PEFC) is of great interest as reactant oxygen is supplied and liquid product water is removed via these PEFC channels. Gas diffusion layer (GDL) intrusion in the channels, which is inherent to the process of PEFC cell and stack assembling, increases the local flow resistance in the intruded channels and consequently lowers their flowrates. This flow maldistribution renders the intruded channels more susceptible to liquid water accumulation or flooding. A one-dimensional analytical model is developed in this work to elucidate the two-phase flow maldistribution in PEFC channels resulting from GDL intrusion. Relative humidity (RH) and the stoichiometric flow ratio of inlet gases are found to be the two key parameters controlling the flow maldistribution in PEFC channels. Interestingly, our analysis shows that decreasing the inlet RH worsens flow maldistribution. As GDL intrusion in channels is inevitable, a good flow-field design must be inherently tolerable to flow maldistribution. Using the analytical model presented herein, the number of flow channels and their U-turns are optimized to minimize the detrimental effect of GDL intrusion.",
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Analytical model of flow maldistribution in polymer electrolyte fuel cell channels. / Basu, Suman; Wang, Chao Yang; Chen, Ken S.

In: Chemical Engineering Science, Vol. 65, No. 23, 01.12.2010, p. 6145-6154.

Research output: Contribution to journalArticle

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