A Numerical Study on the Effects of Gas Channel Wettability in PEM Fuel Cells

Alrahmani, Mosab A.; Chen, Rui; Ibrahim, Salah S.; Patel, Samir

doi:10.1149/04801.0081ecst

Cited by 4 publications

(3 citation statements)

References 20 publications

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“…The volume of fluid (VOF) method along with a piecewise linear interface calculation is used for surface‐tracking in a fixed Eulerian mesh. In the current work, ANSYS FLUENT 17.2 software was used to numerically simulate unsteady laminar 2‐fluid model.…”

Section: Methodsmentioning

confidence: 99%

“…The factors that affect the removing process include the gas flow velocity, the shape of the channel cross section and its dimensions, the droplet size, contact angle, and its emergence location. Alrahmani et al investigated numerically the effect of gas channel geometry on the water removal process in PEMFCs. Different configurations of gas channel cross section including square, trapezoid, semicircle, and triangle were investigated.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation of condensate removal from gas channels of PEM fuel cells using corrugated walls

El-Dosoky

Ahmed

2017

Int J Energy Res

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Summary The removal of condensate water droplets from gas channels is necessary for proper operation of proton exchange membrane fuel cells. In the current work, it is shown that corrugated wall gas channels can help in the removal of condensate water droplets formed on the channel walls. Removal of sessile droplets from channels having semicircle, rectangular dent, and saw‐tooth corrugation and at different gas velocities is modeled numerically. It is shown that the time of condensate removal is much shorter in a corrugated channel as compared with that in an uncorrugated channel. Three different droplet removal regimes are identified: droplet, film, and misty flow regimes. The transition from one to another regime is mapped based on the inlet flow velocity and the type of the channel corrugate.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical simulation of condensate removal from gas channels of PEM fuel cells using corrugated walls

El-Dosoky

Ahmed

2017

Int J Energy Res

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“…The design of traditional flow channels has received significant attention in the literature, with many numerical and experimental studies focusing on flow channel layout [2], shape [3] and wall hydrophobicity [4]. Numerical modelling shows that to minimise excess water saturation, a hydrophobic GDL should be combined with a hydrophilic straight flow channel to transport water from the GDL to the flow channel where it can be more easily removed [5,6]. However, at the bends in serpentine flow channels Song et al [4] demonstrated that a hydrophobic channel wall is best for minimising liquid saturation of the GDL.…”

Section: Introductionmentioning

confidence: 99%

Liquid Water Transport in Porous Metal Foam Flow-Field Fuel Cells: A Two-Phase Numerical Modelling and Ex-Situ Experimental Study

et al. 2019

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Proton exchange membrane fuel cells (PEMFCs) using porous metallic foam flow-field plates have been demonstrated as an alternative to conventional rib and channel designs, showing high performance at high currents. However, the transport of liquid product water through metal foam flow-field plates in PEMFC conditions is not well understood, especially at the individual pore level. In this work, ex-situ experiments are conducted to visualise liquid water movement within a metal foam flow-field plate, considering hydrophobicity, foam pore size and air flow rate. A two-phase numerical model is then developed to further investigate the fundamental water transport behaviour in porous metal foam flow-field plates. Both the experimental and numerical work demonstrate that unlike conventional PEMFC channels, air flow rate does not have a strong influence on water removal due to the high surface tensions between the water and foam pore ligaments. A hydrophobic foam was seen to transport liquid water away from the initial injection point faster than a hydrophilic foam. In ex-situ tests, liquid water forms and maintains a random preferential pathway until the flow-field edge is reached. These results suggest that controlled foam hydrophobicity and pore size is the best way of managing water distribution in PEMFCs with porous flow-field plates.

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AI-assisted proton exchange membrane (PEM) fuel cell performance prediction using CFD and data-driven surrogate models

Siddiqa,

Chang,

Naqvi

et al. 2024

International Communications in Heat and Mass Transfer

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A Numerical Study on the Effects of Gas Channel Wettability in PEM Fuel Cells

Cited by 4 publications

References 20 publications

Numerical simulation of condensate removal from gas channels of PEM fuel cells using corrugated walls

Numerical simulation of condensate removal from gas channels of PEM fuel cells using corrugated walls

Liquid Water Transport in Porous Metal Foam Flow-Field Fuel Cells: A Two-Phase Numerical Modelling and Ex-Situ Experimental Study

AI-assisted proton exchange membrane (PEM) fuel cell performance prediction using CFD and data-driven surrogate models

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