Experimental and Numerical Investigation of Reactant Flow in Flow Channels and Leakage Cross Flow through Gas Diffusion Layers in PEM fuel Cells

2019 ◽  
Vol 5 (1) ◽  
pp. 37-48
Author(s):  
Jaewan Park ◽  
Xianguo Li
Keyword(s):  
Fuel Cells ◽  
Numerical Investigation ◽  
Cross Flow ◽  
Pem Fuel Cells ◽  
Gas Diffusion ◽  
Gas Diffusion Layers ◽  
Diffusion Layers ◽  
Flow Channels ◽  
Flow Through ◽  
Reactant Flow

Three-Dimensional Simulations of Transient Response of PEM Fuel Cells

2007 ◽  
Author(s):  
Serhat Yesilyurt
Keyword(s):  
Fuel Cells ◽  
Gas Flow ◽  
Stokes Equations ◽  
Three Dimensional ◽  
Pem Fuel Cells ◽  
Gas Diffusion ◽  
Load Pressure ◽  
Gas Diffusion Layers ◽  
Diffusion Layers ◽  
Flow Channels

Transients have utmost importance in the lifetime and performance degradation of PEM fuel cells. Recent studies show that cyclic transients can induce hygro-thermal fatigue. In particular, the amount of water in the membrane varies significantly during transients, and determines the ionic conductivity and the structural properties of the membrane. In this work, we present three-dimensional time-dependent simulations and analysis of the transport in PEM fuel cells. U-sections of anode and cathode serpentine flow channels, anode and cathode gas diffusion layers, and the membrane sandwiched between them are modeled using incompressible Navier-Stokes equations in the gas flow channels, Maxwell-Stefan equations in the channels and gas diffusion layers, advection-diffusion-type equation for water transport in the membrane and Ohm’s law for ionic currents in the membrane and electric currents in gas diffusion electrodes. Transient responses to step changes in load, pressure and the relative humidity of the cathode are obtained from simulations, which are conducted by means of a third party finite-element package, COMSOL.

Prediction the Differences of Permeability Between Carbon Fiber Paper and Carbon Fiber Cloth in PEM Fuel Cells

2011 ◽  
Author(s):  
Yuan Gao
Keyword(s):  
Fuel Cells ◽  
Carbon Fiber ◽  
Pem Fuel Cells ◽  
Gas Diffusion ◽  
Anisotropic Permeability ◽  
Gas Diffusion Layers ◽  
X Ray ◽  
Diffusion Layers ◽  
Carbon Fiber Cloth ◽  
Carbon Fiber Paper

This study is using the multiple relaxation time Lattice Boltzmann method to calculate the permeability of carbon fiber paper and carbon fiber cloth gas diffusion layers (GDL). The 3D gas diffusion layers are generated by X-ray computed tomography, This method involve generation of 3D digital model of gas diffusion layers acquired through X-ray micro-tomography at resolution of a few micros. The reconstructed 3D images were then read into the LBM model to calculate the anisotropic permeability of carbon fiber paper and carbon fiber cloth GDL. We investigated the relationships between the anisotropic permeability and porosity and compare the difference between the two different kinds of GDLs when they have the similar porosity. We also calculate the permeability with different viscosity and compare the two results from the carbon fiber paper and carbon fiber cloth. It is useful for selection of materials for high performance gas diffusion media and can improve the performance of the fuel cells.

Advanced Gas Diffusion Layers for PEM Fuel Cells

2019 ◽  
Vol 33 (1) ◽  
pp. 1123-1132
Author(s):  
Vesna Stanic ◽  
Jason Tatalovich
Keyword(s):  
Fuel Cells ◽  
Pem Fuel Cells ◽  
Gas Diffusion ◽  
Gas Diffusion Layers ◽  
Diffusion Layers

Microstructure of Gas Diffusion Layers for PEM Fuel Cells

Fuel Cells ◽  
2012 ◽  
Vol 12 (3) ◽  
pp. 382-390 ◽  
Author(s):  
N. Parikh ◽  
J. S. Allen ◽  
R. S. Yassar
Keyword(s):  
Fuel Cells ◽  
Pem Fuel Cells ◽  
Gas Diffusion ◽  
Gas Diffusion Layers ◽  
Diffusion Layers
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