Influence of threshold variation on determining the properties of a polymer electrolyte fuel cell gas diffusion layer in X-ray nano-tomography
Hossein Ostadi
Kyle Jiang
Pratap Rama
Yu Liu
Rui Chen
Xiaoxian Zhang
2134/8311
https://repository.lboro.ac.uk/articles/journal_contribution/Influence_of_threshold_variation_on_determining_the_properties_of_a_polymer_electrolyte_fuel_cell_gas_diffusion_layer_in_X-ray_nano-tomography/9225356
Morphological parameters of a 3D binary image of a porous carbon gas diffusion layer (GDL) for
polymer electrolyte fuel cells (PEFC) reconstructed using X-ray nano-tomography scanning have
been obtained, and influence of small alterations in the threshold value on the simulated flow
properties of the reconstructed GDL has been determined. A range of threshold values with 0.4%
increments on the greyscale map have been applied and the gas permeability of the binary images
have been calculated using a single-phase lattice Botlzmann model (LBM), which is based on the
treatment of nineteen velocities in the three dimensional domain (D3Q19). The porosity, degrees of
anisotropy and the mean pore radius have been calculated directly from segmented voxel
representation. A strong relationship between these parameters and threshold variation has been
established. These findings suggest that threshold selection can significantly affect some of the flow
properties and may strongly influence the computational simulation of micro and nano-scale flows in a
porous structure.
2011-04-20 16:19:43
X-ray nano-tomography
Three-dimensional reconstruction
Threshold
Lattice Boltzmann modelling
Gas diffusion layer
Micro-structure porous materials
Mechanical Engineering
Engineering not elsewhere classified