
451Fuel Cell Stack, Bipolar Plate, and Gas Flow Channel
but also creates more uniform gas concentration distribution over the contact
surface and over the active area of the electrodes. The main idea for con-
sidering the multiple parallel serpentine channels is to increase the contact
surface area with the electrode surface, but with reduced pressure drops. It
is expected that a decrease in cross-sectional area would lead to a more uni-
form distribution gas concentration at electrode surfaces and increased pres-
sure drop. The smallest size will only be limited by the decrease in fuel cell
performance and by limitations in the machining and fab ...