Simulation of liquid water breakthrough in a nanotomography reconstruction of a carbon paper gas‐diffusion layer

Rama, Pratap; Liu, Yu; Chen, Rui; Ostadi, Hossein; Jiang, Kyle; Gao, Yuan; Zhang, Xiaoxian; Fisher, Rosemary; Jeschke, Michael

doi:10.1002/aic.12581

Cited by 9 publications

(8 citation statements)

References 25 publications

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“…Their simulated results were compared to experimental results using a Frazier air tester, and their correlation error was found to be 3% greater than the measured one. This breakthrough, alongside numerous other studies [28][29][30], showed that XCT and LB are well suited for combination to accurately model liquid water flow through a PEMFC GDL.…”

Section: Introductionmentioning

confidence: 70%

“…The density ( / ) and viscosity ( / ) ratios of water and air are 1:800 and 1:15 respectively, which is beyond the capabilities of the LB method used in this work. Such high densities used in the LB method used in this work could lead to numerical instabilities [28,29].…”

Section: Model Validationmentioning

confidence: 99%

“…An average pore diameter of 10 µm was taken from the work in [28,29], and subsequently used in this work. Values for the Bond, capillary, Reynolds, and Weber were also taken from [29].…”

Section: Model Validationmentioning

confidence: 99%

“…̅ denotes the fluid-fluid interfacial tension, whereas is responsible for denoting the wettability of the solid wall. These parameters are not practically measurable, and therefore a series of numerical experiments were undertaken [28] to ascertain values. Said values were used in this study.…”

Section: Model Validationmentioning

confidence: 99%

“…Many works therefore ignore the binder material altogether, resulting in an over-simplification and possibly altering the pore size and shape within the model. For these reasons, XCT techniques have been increasingly used in this field to more accurately reconstruct the GDL material in a digital domain [28][29][30][31]. Rama et al [24] undertook a study on the feasibility of using the combined methods of XCT and LB modelling to simulate liquid flow, at a pore scale, through PEMFC GDL materials.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

The effects of gas diffusion layers structure on water transportation using X-ray computed tomography based Lattice Boltzmann method

Jinuntuya

Whiteley

Chen

et al. 2018

Journal of Power Sources

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show abstract

Section: Introductionmentioning

confidence: 70%

Section: Model Validationmentioning

confidence: 99%

“…An average pore diameter of 10 µm was taken from the work in [28,29], and subsequently used in this work. Values for the Bond, capillary, Reynolds, and Weber were also taken from [29].…”

Section: Model Validationmentioning

confidence: 99%

Section: Model Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The effects of gas diffusion layers structure on water transportation using X-ray computed tomography based Lattice Boltzmann method

Jinuntuya

Whiteley

Chen

et al. 2018

Journal of Power Sources

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Pore-Scale Transport and Two-Phase Fluid Structures in Fibrous Porous Layers: Application to Fuel Cells and Beyond

et al. 2020

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We present pore-scale simulations of two-phase flows in a reconstructed fibrous porous layer. The three-dimensional microstructure of the material, a fuel cell gas diffusion layer, is acquired via X-ray computed tomography and used as input for lattice Boltzmann simulations. We perform a quantitative analysis of the multiphase pore-scale dynamics, and we identify the dominant fluid structures governing mass transport. The results show the existence of three different regimes of transport: a fast inertial dynamics at short times, characterised by a compact uniform front, a viscous-capillary regime at intermediate times, where liquid is transported along a gradually increasing number of preferential flow paths of the size of one–two pores, and a third regime at longer times, where liquid, after having reached the outlet, is exclusively flowing along such flow paths and the two-phase fluid structures are stabilised. We observe that the fibrous layer presents significant variations in its microscopic morphology, which have an important effect on the pore invasion dynamics, and counteract the stabilising viscous force. Liquid transport is indeed affected by the presence of microstructure-induced capillary pressures acting adversely to the flow, leading to capillary fingering transport mechanism and unstable front displacement, even in the absence of hydrophobic treatments of the porous material. We propose a macroscopic model based on an effective contact angle that mimics the effects of the such a dynamic capillary pressure. Finally, we underline the significance of the results for the optimal design of face masks in an effort to mitigate the current COVID-19 pandemic.

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Designing graded fuel cell electrodes for proton exchange membrane (PEM) fuel cells with recurrent neural network (RNN) approaches

Lei

Lü

Jiang

et al. 2023

Chemical Engineering Science

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Simulation of liquid water breakthrough in a nanotomography reconstruction of a carbon paper gas‐diffusion layer

Cited by 9 publications

References 25 publications

The effects of gas diffusion layers structure on water transportation using X-ray computed tomography based Lattice Boltzmann method

The effects of gas diffusion layers structure on water transportation using X-ray computed tomography based Lattice Boltzmann method

Pore-Scale Transport and Two-Phase Fluid Structures in Fibrous Porous Layers: Application to Fuel Cells and Beyond

Designing graded fuel cell electrodes for proton exchange membrane (PEM) fuel cells with recurrent neural network (RNN) approaches

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