Predictions of flow regimes in proton exchange membrane fuel cells: An analytical approach
| Autor: | Lifeng Zhang, Ryan Anderson, Paria Rahimian |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Work (thermodynamics)
Chromatography Renewable Energy Sustainability and the Environment Chemistry Flow (psychology) Energy Engineering and Power Technology Proton exchange membrane fuel cell Flow channel 02 engineering and technology Mechanics Force balance 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Physics::Fluid Dynamics Fuel Technology Range (aeronautics) Wetting Two-phase flow Physics::Chemical Physics 0210 nano-technology |
| Zdroj: | International Journal of Hydrogen Energy. 42:4679-4689 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2016.11.064 |
| Popis: | Water management in proton exchange membrane (PEM) fuel cells still remains a topic of much investigation in order to maintain satisfactory cell performance. One specific water management issue relates to the gas–liquid flows that occur when water enters the reactant flow field channels, which are typically microchannels or minichannels. The emergence of liquid water to the flow channel is very unique, starting with a form of liquid droplet. The liquid droplet grows and becomes unstable at high gas velocities. Detachment of unstable droplets leads to various flow regimes possibly observed in active fuel cells, including droplet, slug, film, and pseudo-single-phase flows. In this work, a force balance analysis was conducted to determine stability of a liquid droplet under different operating conditions of great relevance to fuel cell operation. After droplet detachment, a theoretical approach was developed to define which flow regime will form. The force balance analysis considered different wetting scenarios in the channels, and a range of superficial velocities of importance to PEM fuel cells was taken into account. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect