Evaluation of Two-Phase Condition and Mass Transfer in GDL With Pore Network Model

2009 ◽  
Author(s):  
Gen Inoue ◽  
Yosuke Matsukuma ◽  
Masaki Minemoto
Keyword(s):  
Network Model ◽  
Effective Diffusion ◽  
Gas Diffusion ◽  
Pore Network Model ◽  
Two Phase ◽  
Actual Structure ◽  
Actual Measurement ◽  
Output Performance ◽  
Phase Condition ◽  
Diffusion Coefficient Of Oxygen

In order to improve the output performance of PEFC, it is important to investigate the two-phase condition in gas diffusion layer (GDL). In this study, the simulated GDL structure was developed by numerical analysis including the random orientation of carbon fibers and binders. And detailed structural estimation was carried out. As structural properties, pore size distribution, electrical resistivity and tortuosity were calculated, and these values almost agreed with actual measurement values. Furthermore, our past two-phase network model was improved, and the model based on an actual structure was developed by a direct 3D networking porous structure. And the influence of GDL structure on the two-phase condition with accumulated water was evaluated, and effective diffusion coefficient of oxygen in GDL with liquid water was calculated.

Simulation of Liquid Water Evaporation in GDL for PEMFC Under Gas Purge Condition

2011 ◽  
Author(s):  
Gen Inoue ◽  
Naoyuki Ishibe ◽  
Yosuke Matsukuma ◽  
Masaki Minemoto
Keyword(s):  
Porous Structure ◽  
Network Model ◽  
Liquid Water ◽  
Gas Diffusion ◽  
Water Evaporation ◽  
Uniform Structure ◽  
Interface Area ◽  
Two Phase ◽  
Actual Structure ◽  
Gas Purge

In automotive Polymer Electrolyte Fuel Cell (PEFC) system, dry gas purge operation is needed at shutdown condition in order to remove the liquid water in gas diffusion layer (GDL) and to reduce the oxygen diffusion inhibition by liquid water in GDL. However, exceed drying operation leads to degradation of electrolyte membrane because of little water content. Therefore, drying process has to be optimized. In this study, various GDL structure with unique fiber orientation were simulated by numerical analysis, and the real GDL structure was reconstructed by X-ray CT image of carbon paper GDL. Next, our past two-phase network model was improved to include phase change effect. The multi-block two-phase network model based on an actual structure was developed by a direct 3D networking porous structure. As results, the evaporation interface area depended on the porous structure of GDL, and the overall evaporation rate of homogeneous GDL which has uniform structure was 1.5 time higher than that of heterogeneous GDL because of the difference of this interface area. In addition, in the case of rib and channel, liquid water under channel evaporated faster than that under Rib. It is very important to control the drying operation in order to prevent the excess membrane drying.

Evaluation of Gas Diffusion Performance in Wet GDL with 3D Pore Network Model

2019 ◽  
Vol 25 (1) ◽  
pp. 1519-1527 ◽  
Author(s):  
Gen Inoue ◽  
Yosuke Matsukuma ◽  
Masaki Minemoto
Keyword(s):  
Network Model ◽  
Pore Network ◽  
Gas Diffusion ◽  
Pore Network Model

Based on the Pore Network Model of CO2-Water-Quartz System Two-Phase Flow Characteristics Study

2014 ◽  
Vol 962-965 ◽  
pp. 1289-1292 ◽  
Author(s):  
Ling Yu Chen ◽  
Yu Liu ◽  
Meiheriayi Mutailipu
Keyword(s):  
Network Model ◽  
Two Phase Flow ◽  
Flow Characteristics ◽  
Pore Network ◽  
Pore Network Model ◽  
Phase Flow ◽  
Saline Aquifer ◽  
Two Phase ◽  
Aquifer Storage ◽  
Relative Permeability Curves

Saline aquifer storage is considered to be one of the main ways to realize CO2 geological sequestration. The purpose of the paper is to research CO2 and water seepage characteristics under the condition of different pressure and diameter of glass sand. First, establish four kinds of sand packed beds pore network model. Secondly, measuring the gas-liquid interfacial tension, contact angle under the condition of 50°C and different pressure (5-20MPa). Finally, using the two-phase flow model, obtain the gas-liquid two-phase relative permeability curves under different conditions. The simulation results of this paper can help to predict the actual saline aquifer storage of CO2 sequestration.

scholarly journals Validating the Generalized Pore Network Model Using Micro-CT Images of Two-Phase Flow

2019 ◽  
Vol 130 (2) ◽  
pp. 405-424 ◽  
Author(s):  
Ali Q. Raeini ◽  
Jianhui Yang ◽  
Igor Bondino ◽  
Tom Bultreys ◽  
Martin J. Blunt ◽  
...  
Keyword(s):  
Network Model ◽  
Two Phase Flow ◽  
Pore Network ◽  
Ct Images ◽  
Pore Network Model ◽  
Phase Flow ◽  
Micro Ct ◽  
Two Phase

Simulation of two-phase flow in soils using microscopic pore network model

2014 ◽  
pp. 877-882
Author(s):  
Jay Meegoda ◽  
Shengyan Gao ◽  
Liming Hu ◽  
Pengwei Zhang
Keyword(s):  
Network Model ◽  
Two Phase Flow ◽  
Pore Network ◽  
Pore Network Model ◽  
Phase Flow ◽  
Two Phase
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