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Journal of Power Sources
Article
License: Elsevier Non-Commercial
Data sources: UnpayWall
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Journal of Power Sources
Article . 2016
License: Elsevier Non-Commercial
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Journal of Power Sources
Article . 2016 . Peer-reviewed
License: Elsevier TDM
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Advanced control of liquid water region in diffusion media of polymer electrolyte fuel cells through a dimensionless number

Authors: Wang, Yun; Chen, Ken S.;

Advanced control of liquid water region in diffusion media of polymer electrolyte fuel cells through a dimensionless number

Abstract

In the present work, a three-dimension (3-D) model of polymer electrolyte fuel cells (PEFCs) is employed to investigate the complex, non-isothermal, two-phase flow in the gas diffusion layer (GDL). Phase change in gas flow channels is explained, and a simplified approach accounting for phase change is incorporated into the fuel cell model. It is found that the liquid water contours in the GDL are similar along flow channels when the channels are subject to two-phase flow. Analysis is performed on a dimensionless parameter Da0 introduced in our previous paper [Y. Wang and K. S. Chen, Chemical Engineering Science 66 (2011) 3557–3567] and the parameter is further evaluated in a realistic fuel cell. We found that the GDL's liquid water (or liquid-free) region is determined by the Da0 number which lumps several parameters, including the thermal conductivity and operating temperature. By adjusting these factors, a liquid-free GDL zone can be created even though the channel stream is two-phase flow. Such a liquid-free zone is adjacent to the two-phase region, benefiting local water management, namely avoiding both severe flooding and dryness.

Country
United States
Keywords

Dimensionless number, Energy, 660, Renewable Energy, Sustainability and the Environment, 621, Energy Engineering and Power Technology, Liquid water region, Engineering, Polymer electrolyte fuel cells, Non-isothermal, Chemical Sciences, Phase change, Physical and Theoretical Chemistry, Electrical and Electronic Engineering

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
14
Top 10%
Average
Top 10%
Green
hybrid