The Effects of Morphological and Wetting Properties of Porous Transport Layers on Water Movement in PEM Fuel Cells

Médici, Ezequiel; Allen, Jeffrey S.

doi:10.1149/1.3474958

Cited by 51 publications

(58 citation statements)

References 39 publications

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“…The pressure-volume function may be constant (7,11,12), may vary as a function of the meniscus position inside the pore mimicking pore throat effect (16), or by defining an irregular pore shape (15).…”

Section: Pore-network Model and Simulationmentioning

confidence: 99%

“…The fluid flow behavior inside the network of tubes is modeled as modified Poiseuille flow that includes two-phase flow and capillary pressure effects (7). A detailed description of this model is presented in Medici and Allen (16).…”

Section: Simulation Of Water Percolation In a Ptlmentioning

confidence: 99%

“…An equivalent network could be generated using constant diameter tubes and a distribution of wettability. The resulting linear system of equations is solved using the Conjugated Gradient Stabilized Method (16). After calculating the pressure gradient, the new fluid position inside each tube is calculated proportional to the pressure gradient in that tube while satisfying mass conservation.…”

Section: Simulation Of Water Percolation In a Ptlmentioning

confidence: 99%

“…The simulation ends when the liquid water reaches the gas flow channel. (16) a limitation of the network model, but the volume is compensated with an increase or decrease in the pore volume.…”

Section: Insights Gained From Isothermal Pore-network Simulationsmentioning

confidence: 99%

“…• Pressure in the catalyst layer and water saturation in the PTL can be independently altered through variation in pore size distribution, wettability, and structure (16).…”

Section: Ecs Transactions 41 (1) 165-178 (2011)mentioning

confidence: 99%

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Modeling and Diagnostics of Fuel Cell Porous Media for Improving Water Transport

Médici¹,

Allen²

2011

ECS Trans.

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When a fuel cell is operating at high current density, water accumulation is a significant cause of performance and component degradation. Investigating the water transport inside the fuel cell is a challenging task due to opacity of the components, the randomness of the porous materials, and the difficulty in gain access to the interior for measurement due to the small dimensions of components. Numerical simulation can provide a good insight of the evolution of the water transport under different working condition. However, the validation of those simulations is remains an issue due the same experimental obstacles associated with in-situ measurements.The discussion herein will focus on pore-network modeling of the water transport on the PTL and the insights gained from simulations as well as in the validation technique. The implications of a recently published criterion to characterize PTL, based on percolation theory, and validate numerical simulation are discussed.

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Section: Pore-network Model and Simulationmentioning

confidence: 99%

Section: Simulation Of Water Percolation In a Ptlmentioning

confidence: 99%

Section: Simulation Of Water Percolation In a Ptlmentioning

confidence: 99%

Section: Insights Gained From Isothermal Pore-network Simulationsmentioning

confidence: 99%

“…• Pressure in the catalyst layer and water saturation in the PTL can be independently altered through variation in pore size distribution, wettability, and structure (16).…”

Section: Ecs Transactions 41 (1) 165-178 (2011)mentioning

confidence: 99%

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Modeling and Diagnostics of Fuel Cell Porous Media for Improving Water Transport

Médici¹,

Allen²

2011

ECS Trans.

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Water Flow in, Through, and Around the Gas Diffusion Layer

et al. 2012

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Liquid water produced in polymer electrolyte membrane fuel cells is transported from the cathode catalyst/membrane interface through the gas diffusion layer (GDL) to the gas flow channel. Liquid water travels both laterally (in the plane of GDL) and transversely through the largest pores of the porous GDL structure. Narrow apertures in the largest pores are the primary resistance to liquid water penetration. Carbon paper has limiting apertures ∼20 μm in diameter and ∼1 μm in length whereas carbon cloth has apertures ∼100 μm in diameter and ∼200 μm in length. After sufficient hydrostatic pressure is applied, water penetrates the limiting aperture and flows through the pore. The pressure required for water to flow through the pores is less than the pressure to penetrate the limiting aperture of the pores. Water moved laterally and directed through a small number of transverse pores. There is less resistance to lateral liquid water flow at the interface between the GDL and a solid surface than through the GDL. The results from these experiments suggest that water flow through the GDL is dominated by a small number of pores and most pores remain free of liquid water.

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Continuum, Macroscopic Modeling of Polymer-Electrolyte Fuel Cells

Balasubramanian

Weber

2015

Physical Multiscale Modeling and Numerical Simulation of Electrochemical Devices for Energy Conversion and Storage

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The Effects of Morphological and Wetting Properties of Porous Transport Layers on Water Movement in PEM Fuel Cells

Cited by 51 publications

References 39 publications

Modeling and Diagnostics of Fuel Cell Porous Media for Improving Water Transport

Modeling and Diagnostics of Fuel Cell Porous Media for Improving Water Transport

Water Flow in, Through, and Around the Gas Diffusion Layer

Continuum, Macroscopic Modeling of Polymer-Electrolyte Fuel Cells

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