A novel design of distribution zone in scaled‐up PEM fuel cells based on active control of transverse flow

Abstract

The flow distribution is of significance to the fuel cell performance and durability, which has been studied from a theoretical and practical level in this work. The transverse‐flow‐control‐based mechanism behind flow distribution processes is revealed. The core lies in the reasonable generation and distribution of transverse flow, which are the prerequisite and co‐requisite for flow homogeneity. For the dual purpose, a novel design of combined‐mesh‐type distribution zone is proposed incorporating central horizontal meshes and lateral vertical meshes. The design philosophy and methodology are clarified. Under these guidelines, the novel distributor design is applied to different flow field plate geometries including the shorter distribution zone, higher expansion ratio, and scaled‐up fuel cell. Through organized and detailed simulations, two key geometrical parameters (porosities of central and lateral meshes) are quantified and the superior effect on flow distribution is validated.

Dynamic Behavior and Drainage Characteristics of Water Droplets within Channel-Type Collection Zone in Proton Exchange Membrane Fuel Cells

“…The magnitude of the velocity is determined to be 8 m/s on the basis of our previous research. 68 This is because the structure employed in this study is located at the junction between the reaction zone and the collection zone of the BP selected in our previous study where the gas velocity is around 8 m/s (v in = 8 m/s). The inlet Reynolds number is calculated to be 577.9, which corresponds to a laminar flow state.…”

“…The surface tension coefficient between air and water is 0.072 N/m. , The inlet boundary condition is the velocity inlet. The magnitude of the velocity is determined to be 8 m/s on the basis of our previous research . This is because the structure employed in this study is located at the junction between the reaction zone and the collection zone of the BP selected in our previous study where the gas velocity is around 8 m/s ( v in = 8 m/s).…”