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Two phase flow simulation in a channel of a polymer electrolyte membrane fuel cell using the lattice Boltzmann method

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Title: Two phase flow simulation in a channel of a polymer electrolyte membrane fuel cell using the lattice Boltzmann method
Authors: Ben Salah, Yasser Browse this author
Tabe, Yutaka Browse this author →KAKEN DB
Chikahisa, Takemi Browse this author →KAKEN DB
Keywords: Lattice Boltzmann method
Dynamic behavior
PEM fuel cell
Large density difference
Issue Date: 1-Feb-2012
Publisher: Elsevier B.V.
Journal Title: Journal of Power Sources
Volume: 199
Start Page: 85
End Page: 93
Publisher DOI: 10.1016/j.jpowsour.2011.10.053
Abstract: Water management in polymer electrolyte (PEM) fuel cells is important for fuel cell performance and durability. Numerical simulations using the lattice Boltzmann method (LBM) are developed to elucidate the dynamic behavior of condensed water and gas flows in a polymer electrolyte membrane (PEM) fuel cell gas channel. A scheme for two-phase flow with large density differences was applied to establish the optimum gas channel design for different gas channel heights, droplet positions, and gas channel walls wettability. The present simulation using the LBM, which considers the actual physical properties of the system, shows the effect of the cross-sectional shape, the droplet initial position, droplet volume and the air flow velocity for both hydrophobic and hydrophilic gas channels. The discussion of optimum channel height and drain performance was made using two factors "pumping efficiency" and "drainage speed". It is shown that deeper channels give better draining efficiency than shallower channels, and the efficiency remains largely unchanged when the droplet touches corners or the top of walls in the gas channel. As the droplet velocity, i.e. the drainage flow rate, becomes higher and the drainage efficiency becomes less dependent on droplet locations with shallower channels, shallower channels are better than deeper channels as the pumping efficiency is not greatly affected. Introducing a new dimensionless parameter, "pumping efficiency", the investigation discusses the effect of the various parameters on the drainage performance of a PEM fuel cell gas channel.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 近久 武美

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