In this study, two-phase flow of oxygen-water is studied by using numerical simulation in the Porous Transport Layer (PTL) of the Polymer Electrolyte Membrane Electrolysis Cell (PEMEC). The effect of thickness, porosity and multi-layer arrangement of PTL on the oxygen flow pattern and its removal from the PTL is investigated. The results showed the increase in the PTL thickness causes to increase the growth of the lateral paths from the inlet to the channel, which leads to increase the oxygen saturation in the PTL. It is also obtained that for PTL with different porosity, number and volume of occupied pores by oxygen in the PTL are the two main factors affecting the oxygen saturation and trade-off between them indicate the proper porosity to be used in different operating conditions. Furthermore, studies showed the use of two-layer PTL instead of single-layer can cause reduction in oxygen saturation in the proximity of reaction sites leading to a better operation of the electrolyzer.
LeeCHBanerjeeRArbabiF, et al. Porous transport layer related mass transport losses in polymer electrolyte membrane electrolysis: a review. In: ASME 2016 14th international conference on nanochannels, microchannels, and minichannels, Washington, DC, 10–14 July 2016, paper no. V001T07A3.
2.
ArbabiFMontazeriHAbouatallahR, et al. Three-dimensional computational fluid dynamics modelling of oxygen bubble transport in polymer electrolyte membrane electrolyzer porous transport layers. J Electrochem Soc2016; 163: F3062–F3069.
3.
FengQYuanXZLiuG, et al. A review of proton exchange membrane water electrolysis on degradation mechanisms and mitigation strategies. J Power Sources2017; 366: 33–55.
4.
KandlikarSGGarofaloMLLuZ.Water management in a PEMFC: water transport mechanism and material degradation in gas diffusion layers. Fuel Cells2011; 11: 814–823.
5.
ItoHMaedaTNakanoA, et al. Experimental study on porous current collectors of PEM electrolyzers. Int J Hydrogen Energy2012; 37: 7418–7428.
6.
HwangCMIshidaMItoH, et al. Influence of properties of gas diffusion layers on the performance of polymer electrolyte-based unitized reversible fuel cells. Int J Hydrogen Energy2011; 36: 1740–1753.
7.
Steen SM. Optimization of Titanium Liquid Gas Diffusion Layers in Proton Exchange Membrane Electrolyzer [dissertation]. [Knoxville]: University of Tennessee - Knoxville; 2015.
8.
Mo J, Steen S, Han B, Kang Z, Terekhov A, Zhang F-Y, et al., editors. Investigation of titanium felt transport parameters for energy storage and hydrogen/oxygen production. In 13th international energy conversion engineering conference 2015 July: 3914
9.
Chen. Q, Wang. Y, Yang. F, Xu. H. Two-dimensional multi-physics modeling of porous transport layer in polymer electrolyte membvrane electrolyzer for water splitting. International Journal of Hydrogen Energy. 2020; 45(58): 32984–94.
10.
KangZYuSYangG, et al. Performance improvement of proton exchange membrane electrolyzer cells by introducing in-plane transport enhancement layers. Electrochim Acta2019; 316: 43–51.
11.
ArbabiFKalantarianAAbouatallahR, et al. Visualizing bubble flows in electrolyzer GDLs using microfluidic platforms. ECS Trans2013; 58: 907–918.
12.
ArbabiFKalantarianAAbouatallahR, et al. Feasibility study of using microfluidic platforms for visualizing bubble flows in electrolyzer gas diffusion layers. J Power Sources2014; 258: 142–149.
13.
DjilaliN.Computational modelling of polymer electrolyte membrane (PEM) fuel cells: challenges and opportunities. Energy2007; 32: 269–280.
14.
LeeCHHinebaughJBanerjeeR, et al. Influence of limiting throat and flow regime on oxygen bubble saturation of polymer electrolyte membrane electrolyzer porous transport layers. Int J Hydrogen Energy2017; 42: 2724–2735.
15.
SureshPVJayantiS.Effect of air flow on liquid water transport through a hydrophobic gas diffusion layer of a polymer electrolyte membrane fuel cell. Int J Hydrogen Energy2010; 35: 6872–6886.
16.
LeeJKLeeCBazylakA.Pore network modelling to enhance liquid water transport through porous transport layers for polymer electrolyte membrane electrolyzers. Power Sources2019; 437: 226910.
17.
YuePFengJJLiuC, et al. A diffuse-interface method for simulating two-phase flows of complex fluids. J Fluid Mech2004; 515: 293–317.
18.
YuePZhouCFengJJOllivier-GoochCF, et al. Phase-field simulations of interfacial dynamics in viscoelastic fluids using finite elements with adaptive meshing. J Comput Phys2006; 219: 47–67.
19.
BaiFHeXYangX, et al. Three dimensional phase-field investigation of droplet formation in microfluidic flow focusing devices with experimental validation. Int J Multiphase Flow2017; 93: 130–141.
20.
ItoHMaedaTNakanoA, et al. Effect of flow regime of circulating water on a proton exchange membrane electrolyzer. Int J Hydrogen Energy2010; 35: 9550–9560.
21.
Incropera FP, Bergman TL, Lavine AS, Dewitt DP. Fundamentals of Heat and Mass Transfer. 7 ed. The United States of America: Don Fowley; 2011.
22.
COMSOL. Multiphysics User's Guide [computer program]. 5.2 ed 2012.
23.
LenormandRTouboulEZarconeC.Numerical models and experiments on immiscible displacements in porous media. J Fluid Mech1988; 189: 165–187.
24.
ZhangCOostromMWietsmaTW, et al. Influence of viscous and capillary forces on immiscible fluid displacement: pore-scale experimental study in a water-wet micromodel demonstrating viscous and capillary fingering. Energy Fuels2011; 25: 3493–3505.
