Abstract
Water management is critically important for polymer electrolyte membrane fuel cells (PEMFC), and is complicated by the electroosmotic flow of water from anode to cathode through the polymer electrolyte membrane. In this study, electroosmotic flow in polymer electrolyte membranes is modeled incorporating the electrokinetic effect, and key parameters affecting the PEM fuel cell performance are identified. The governing Poisson–Boltzmann and the Navier–Stokes equations were solved numerically for a single membrane pore to determine the electroosmotic flow through the membrane over a wide range of geometrical and operating conditions. It was found that the electroosmotic drag coefficient, K Drag , increases with the pore diameter. The membrane thickness has a significant effect on the electroosmotic flow. At constant cell voltage, the electroosmotic flow through thicker membranes (e.g. Nafion 117) is reduced because of the reduced electric field strength. The pressure difference required to stop electroosmotic flow is very large due to the extremely small pore diameters. In the presence of sulphuric acid, numerical results have revealed that the electroosmotic flow increases with the acid concentration.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.