An analytical model for gas diffusion though nanoscale and microscale fibrous media

Shou, Dahua; Fan, Jintu; Mei, Maofei; Ding, Feng

doi:10.1007/s10404-013-1215-8

Cited by 58 publications

(18 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…10 shows the prediction of the saturation function Eq. (14) in comparison to the present modeling results and two series of experimental data. The good agreement infers that such a simple saturation function Eq.…”

Section: The Effects Of Liquid Saturationmentioning

confidence: 84%

“…Their model however over-predicted the material diffusivity, and one possible cause is that the gas concentration was assumed in their analysis to be constant at any cross-section of the material. Recently, Shou et al [14] proposed a fractal model for gas diffusion through nanofibrous and microfibrous materials including both the Fick's diffusion and Knudsen diffusion. However, too many simplifications were made such as the pores in fibrous media form a bundle of tortuous open channels with statistically fractal-like sizes.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effective gas diffusion coefficient in fibrous materials by mesoscopic modeling

Guo

et al. 2017

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

Section: The Effects Of Liquid Saturationmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Effective gas diffusion coefficient in fibrous materials by mesoscopic modeling

Guo

et al. 2017

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

“…Multiple experimental [8][9][10][11][12][13][14][15][16][17][18][19], numerical [20][21][22] and semi-analytical [23][24][25][26][27][28] works on the dry effective diffusivity function, ݂ሺߝሻ, for carbon-paper GDLs can be found in the literature. These investigations provide fundamental information about the effects of compression, the fabrics of the substrate, the addition of wet-proofing agents, and the incorporation of micro-porous layers (MPLs) on the effective gas diffusivity of GDLs.…”

Section: Introductionmentioning

confidence: 99%

Effective diffusivity in partially-saturated carbon-fiber gas diffusion layers: Effect of through-plane saturation distribution

García-Salaberri

Hwang

Vera

et al. 2015

International Journal of Heat and Mass Transfer

141

145

View full text Add to dashboard Cite

The effective diffusivity of gaseous species in partially-saturated finite-size porous media is a valuable parameter for mathematical modeling of many processes, but it is difficult to measure experimentally. In this work, the effective diffusivity of carbon-fiber gas diffusion layers (GDLs) used in polymer electrolyte fuel cells (PEFCs) was determined by performing lattice Boltzmann (LB) simulations on X-ray tomographic reconstructions of invading water configurations. Calculations on dry GDLs were in close agreement with previous experimental data; the effective diffusivity was reduced by the addition of PTFE due to the loss of pore volume and the higher tortuosity of transport paths. The effect of water saturation was significantly larger. It was found that the resistance of water to gas transport was extremely dependent on the saturation distribution through the porous medium, particularly the peak saturation, and not just the average saturation as is typically considered in the literature. [...

show abstract

“…Song et al 58,59 calculated the air permeability of nonwoven fabrics and water vapor diffusion coefficient of hydrophobic fibrous materials. Shou et al 60,61 proposed a difference-fractal model for the permeability of viscous flow through fibrous porous media, and presented an analytical model for gas diffusion though nanoscale and microscale fibrous porous media. Several researchers 62-65 applied the fractal scaling laws for pore size distribution and fractal capillary bundle model to study gas diffusion in the porous gas diffusion layer of proton exchange membrane fuel cell.…”

Section: Fractal Models For Transport Physics In Porous Mediamentioning

confidence: 99%

A Discussion on Fractal Models for Transport Physics of Porous Media

2015

Fractals

109

View full text Add to dashboard Cite

Fractal model provides an alternative and useful means for studying the transport phenomenon in porous media and analyzing the macroscopic transport properties of porous media, as fractal geometry can successfully characterize disordered and heterogeneous geometrical microstructures of porous media on multi scales. Recently, fractal models on porous media have attracted increasing interests from many different disciplines. In this mini-review paper, a review on fractal models for number-size distribution in porous media is made, and a unified fractal model to characterize pore and particle size distributions is proposed according to the statistical fractal property of the complex microstructure in porous media. Using the fractal scaling laws for pore and fracture size distributions, a fractal capillary bundle model and a fractal tree-like network model are presented and summarized for homogenous and fractured porous media, respectively. And the applications of the fractal capillary bundle model and fractal tree-like network model for analysis of transport physics in porous media are also reviewed.

show abstract

An analytical model for gas diffusion though nanoscale and microscale fibrous media

Cited by 58 publications

References 39 publications

Effective gas diffusion coefficient in fibrous materials by mesoscopic modeling

Effective gas diffusion coefficient in fibrous materials by mesoscopic modeling

Effective diffusivity in partially-saturated carbon-fiber gas diffusion layers: Effect of through-plane saturation distribution

A Discussion on Fractal Models for Transport Physics of Porous Media

Contact Info

Product

Resources

About