Influence of limiting throat and flow regime on oxygen bubble saturation of polymer electrolyte membrane electrolyzer porous transport layers
| Autor: | Aimy Bazylak, Rainey Wang, James Hinebaugh, Rami Abouatallah, Rupak K. Banerjee, ChungHyuk Lee, Stéphane Chevalier |
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| Rok vydání: | 2017 |
| Předmět: |
Renewable Energy
Sustainability and the Environment Chemistry Capillary action 020209 energy Bubble Flow (psychology) Analytical chemistry Energy Engineering and Power Technology 02 engineering and technology Electrolyte Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics Viscous fingering Fuel Technology embryonic structures 0202 electrical engineering electronic engineering information engineering 0210 nano-technology Porosity Porous medium Saturation (chemistry) |
| Zdroj: | International Journal of Hydrogen Energy. 42:2724-2735 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2016.09.114 |
| Popis: | In this work, the effect of porous transport layer (PTL) microstructure on the growth of oxygen gas bubbles was investigated using a microfluidic platform, termed PTL-on-Chip. The microfluidic chip was designed through stochastic pore network generation and height calibration, and was fabricated using soft-lithography. It was found that PTL throats have the dominating threshold capillary pressures compared to PTL pores; therefore, the size distribution of PTL throats ultimately govern the distribution of bubbles within the water saturated PTL. A unique throat is herein termed the limiting throat, whereby once it has been penetrated by the bubble, breakthrough instantly follows. This limiting throat is also the location of snap-off for subsequent bubble detachment. Within the porous media, oxygen bubble saturation increased as the distance of the limiting throat from the inlet increased. Lastly, it was observed that the heterogeneity of the PTL structure can enable the simultaneous co-existence of two flow regimes (capillary fingering and viscous fingering) at distinct regions within the bulk. |
| Databáze: | OpenAIRE |
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