date: 2019-08-23T08:24:18Z
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pdf:docinfo:title: Pore Network Simulation of Gas-Liquid Distribution in Porous Transport Layers
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subject: Pore network models are powerful tools to simulate invasion and transport processes in porous media. They are widely applied in the field of geology and the drying of porous media, and have recently also received attention in fuel cell applications. Here we want to describe and discuss how pore network models can be used as a prescriptive tool for future water electrolysis technologies. In detail, we suggest in a first approach a pore network model of drainage for the prediction of the oxygen and water invasion process inside the anodic porous transport layer at high current densities. We neglect wetting liquid films and show that, in this situation, numerous isolated liquid clusters develop when oxygen invades the pore network. In the simulation with narrow pore size distribution, the volumetric ratio of the liquid transporting clusters connected between the catalyst layer and the water supply channel is only around 3% of the total liquid volume contained inside the pore network at the moment when the water supply route through the pore network is interrupted; whereas around 40% of the volume is occupied by the continuous gas phase. The majority of liquid clusters are disconnected from the water supply routes through the pore network if liquid films along the walls of the porous transport layer are disregarded. Moreover, these clusters hinder the countercurrent oxygen transport. A higher ratio of liquid transporting clusters was obtained for greater pore size distribution. Based on the results of pore network drainage simulations, we sketch a new route for the extraction of transport parameters from Monte Carlo simulations, incorporating pore scale flow computations and Darcy flow.
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dc:title: Pore Network Simulation of Gas-Liquid Distribution in Porous Transport Layers
modified: 2019-08-23T08:24:18Z
cp:subject: Pore network models are powerful tools to simulate invasion and transport processes in porous media. They are widely applied in the field of geology and the drying of porous media, and have recently also received attention in fuel cell applications. Here we want to describe and discuss how pore network models can be used as a prescriptive tool for future water electrolysis technologies. In detail, we suggest in a first approach a pore network model of drainage for the prediction of the oxygen and water invasion process inside the anodic porous transport layer at high current densities. We neglect wetting liquid films and show that, in this situation, numerous isolated liquid clusters develop when oxygen invades the pore network. In the simulation with narrow pore size distribution, the volumetric ratio of the liquid transporting clusters connected between the catalyst layer and the water supply channel is only around 3% of the total liquid volume contained inside the pore network at the moment when the water supply route through the pore network is interrupted; whereas around 40% of the volume is occupied by the continuous gas phase. The majority of liquid clusters are disconnected from the water supply routes through the pore network if liquid films along the walls of the porous transport layer are disregarded. Moreover, these clusters hinder the countercurrent oxygen transport. A higher ratio of liquid transporting clusters was obtained for greater pore size distribution. Based on the results of pore network drainage simulations, we sketch a new route for the extraction of transport parameters from Monte Carlo simulations, incorporating pore scale flow computations and Darcy flow.
pdf:docinfo:subject: Pore network models are powerful tools to simulate invasion and transport processes in porous media. They are widely applied in the field of geology and the drying of porous media, and have recently also received attention in fuel cell applications. Here we want to describe and discuss how pore network models can be used as a prescriptive tool for future water electrolysis technologies. In detail, we suggest in a first approach a pore network model of drainage for the prediction of the oxygen and water invasion process inside the anodic porous transport layer at high current densities. We neglect wetting liquid films and show that, in this situation, numerous isolated liquid clusters develop when oxygen invades the pore network. In the simulation with narrow pore size distribution, the volumetric ratio of the liquid transporting clusters connected between the catalyst layer and the water supply channel is only around 3% of the total liquid volume contained inside the pore network at the moment when the water supply route through the pore network is interrupted; whereas around 40% of the volume is occupied by the continuous gas phase. The majority of liquid clusters are disconnected from the water supply routes through the pore network if liquid films along the walls of the porous transport layer are disregarded. Moreover, these clusters hinder the countercurrent oxygen transport. A higher ratio of liquid transporting clusters was obtained for greater pore size distribution. Based on the results of pore network drainage simulations, we sketch a new route for the extraction of transport parameters from Monte Carlo simulations, incorporating pore scale flow computations and Darcy flow.
pdf:docinfo:creator: Nicole Vorhauer, Haashir Altaf, Evangelos Tsotsas and Tanja Vidakovic-Koch
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meta:author: Nicole Vorhauer, Haashir Altaf, Evangelos Tsotsas and Tanja Vidakovic-Koch
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Creation-Date: 2019-08-23T08:24:18Z
Author: Nicole Vorhauer, Haashir Altaf, Evangelos Tsotsas and Tanja Vidakovic-Koch
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Keywords: pore network model; Monte Carlo simulation; drainage invasion; porous transport layer; clustering effect; water electrolysis
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dc:creator: Nicole Vorhauer, Haashir Altaf, Evangelos Tsotsas and Tanja Vidakovic-Koch
dcterms:created: 2019-08-23T08:24:18Z
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title: Pore Network Simulation of Gas-Liquid Distribution in Porous Transport Layers
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pdf:docinfo:keywords: pore network model; Monte Carlo simulation; drainage invasion; porous transport layer; clustering effect; water electrolysis
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creator: Nicole Vorhauer, Haashir Altaf, Evangelos Tsotsas and Tanja Vidakovic-Koch
dc:subject: pore network model; Monte Carlo simulation; drainage invasion; porous transport layer; clustering effect; water electrolysis
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meta:keyword: pore network model; Monte Carlo simulation; drainage invasion; porous transport layer; clustering effect; water electrolysis
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