scholarly journals Exploring the Effect of the Pore Size Distribution on the Streaming Potential Generation in Saturated Porous Media, Insight From Pore Network Simulations

2019 ◽  
Vol 124 (6) ◽  
pp. 5315-5335 ◽  
Author(s):  
Damien Jougnot ◽  
Aida Mendieta ◽  
Philippe Leroy ◽  
Alexis Maineult
Keyword(s):  
Porous Media ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Streaming Potential ◽  
Pore Network ◽  
Saturated Porous Media ◽  
Potential Generation ◽  
Network Simulations

scholarly journals Pore Network Analysis of Zone Model for Porous Media Drying

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Yuan Yuejin ◽  
Zhao Zhe ◽  
Nie Junnan ◽  
Xu Yingying
Keyword(s):  
Porous Media ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Phase Distribution ◽  
Pore Network ◽  
Pore Network Model ◽  
Zone Model ◽  
Drying Process ◽  
Isothermal Drying

In view of the fact that the zone model for porous media drying cannot disclose the mechanism of liquid phase distribution effectively, a pore network model for the slow isothermal drying process of porous media was developed by applying the theories of pore network drying and transport-process, which fused the physical parameters of porous media, such as porosity, pore mean diameter, and pore size distribution into the model parameters, and a sand bed drying experiment was conducted to verify the validity of this model. The experiment and simulation results indicate that the pore network model could explain the slow isothermal drying process of porous media well. The pore size distributions of porous media have a great effect on the liquid phase distribution of the drying process. The dual-zone model is suitable for the porous media whose pore size distribution obeys Gaussian distribution, while the three-zone model is suitable for the porous media whose pore size distribution obeys the lognormal distribution when the drying analysis of porous media is conducted.

PREDICTIVE-DESCRIPTIVE MODELS FOR GAS AND SOLUTE DIFFUSION COEFFICIENTS IN VARIABLY SATURATED POROUS MEDIA COUPLED TO PORE-SIZE DISTRIBUTION

Soil Science ◽  
2005 ◽  
Vol 170 (11) ◽  
pp. 867-880 ◽  
Author(s):  
Per Moldrup ◽  
Torben Olesen ◽  
Seiko Yoshikawa ◽  
Toshiko Komatsu ◽  
Ann M. McDonald ◽  
...  
Keyword(s):  
Porous Media ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Diffusion Coefficients ◽  
Solute Diffusion ◽  
Saturated Porous Media ◽  
Descriptive Models

scholarly journals Pore Network Simulation of Gas-Liquid Distribution in Porous Transport Layers

Processes ◽  
2019 ◽  
Vol 7 (9) ◽  
pp. 558 ◽  
Author(s):  
Nicole Vorhauer ◽  
Haashir Altaf ◽  
Evangelos Tsotsas ◽  
Tanja Vidakovic-Koch
Keyword(s):  
Porous Media ◽  
Water Supply ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Network Models ◽  
Pore Network ◽  
Liquid Films ◽  
Transport Layer ◽  
Liquid Clusters

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.

PREDICTIVE-DESCRIPTIVE MODELS FOR GAS AND SOLUTE DIFFUSION COEFFICIENTS IN VARIABLY SATURATED POROUS MEDIA COUPLED TO PORE-SIZE DISTRIBUTION

Soil Science ◽  
2007 ◽  
Vol 172 (10) ◽  
pp. 741-750 ◽  
Author(s):  
Per Moldrup ◽  
Torben Olesen ◽  
Helle Blendstrup ◽  
Toshiko Komatsu ◽  
Lis W. de Jonge ◽  
...  
Keyword(s):  
Porous Media ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Diffusion Coefficients ◽  
Solute Diffusion ◽  
Saturated Porous Media ◽  
Descriptive Models

scholarly journals Steady-State Water Drainage by Oxygen in Anodic Porous Transport Layer of Electrolyzers: A 2D Pore Network Study

Processes ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 362 ◽  
Author(s):  
Haashir Altaf ◽  
Nicole Vorhauer ◽  
Evangelos Tsotsas ◽  
Tanja Vidaković-Koch
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Network Model ◽  
Phase Interface ◽  
Pore Network ◽  
Transport Layer ◽  
Pore Network Model ◽  
Network Simulations ◽  
The Impact

Recently, pore network modelling has been attracting attention in the investigation of electrolysis. This study focuses on a 2D pore network model with the purpose to study the drainage of water by oxygen in anodic porous transport layers (PTL). The oxygen gas produced at the anode catalyst layer by the oxidation of water flows counter currently to the educt through the PTL. When it invades the water-filled pores of the PTL, the liquid is drained from the porous medium. For the pore network model presented here, we assume that this process occurs in distinct steps and applies classical rules of invasion percolation with quasi-static drainage. As the invasion occurs in the capillary-dominated regime, it is dictated by the pore structure and the pore size distribution. Viscous and liquid film flows are neglected and gravity forces are disregarded. The curvature of the two-phase interface within the pores, which essentially dictates the invasion process, is computed from the Young Laplace equation. We show and discuss results from Monte Carlo pore network simulations and compare them qualitatively to microfluidic experiments from literature. The invasion patterns of different types of PTLs, i.e., felt, foam, sintered, are compared with pore network simulations. In addition to this, we study the impact of pore size distribution on the phase patterns of oxygen and water inside the pore network. Based on these results, it can be recommended that pore network modeling is a valuable tool to study the correlation between kinetic losses of water electrolysis processes and current density.

Comparison of transport between two bacteria in saturated porous media with distinct pore size distribution

RSC Advances ◽  
2016 ◽  
Vol 6 (18) ◽  
pp. 14602-14614 ◽  
Author(s):  
Hongjuan Bai ◽  
Nelly Cochet ◽  
Audrey Drelich ◽  
André Pauss ◽  
Edvina Lamy
Keyword(s):  
Escherichia Coli ◽  
Porous Media ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Saturated Porous Media ◽  
Flow Conditions ◽  
Microbial Transport ◽  
Saturated Flow ◽  
Transport Behaviour

The transport behaviour ofEscherichia coliandKlebsiellasp. was studied under saturated flow conditions to explore the effect of pore size distribution and bacteria cell properties on microbial transport.

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