Simplification techniques of CFD simulations and experimental validation for fluid flow analysis in PEM fuel cells: A review

Abstract

Abstract Studies on proton exchange membrane fuel cells [PEMFCs] have shown that poor fluid distribution can lead to a higher probability of concentration, ohmic, and activation losses which affects the overall electrochemical and power output performance as well as reduced cell durability. Hence, understanding fluid dynamics are imperative to identify strategies that will improve the fluid distribution uniformity and optimise reactant transport. Most fluid flow studies for PEMFCs are done through computational fluid dynamic [CFD] simulations as it is a cost-saving research method with dependable accuracy levels. In some cases, real-life experiments are executed concurrently to justify the simulation results and theories made. However, there are instances where simplifications are needed for both CFD simulations and experiments for easier and clearer fluid analysis. This short review will first discuss the simplification strategies used to simulate PEMFC models in both 2-dimensional [2D] and 3-dimensional [3D] dimensions, covering theories or concepts that can prove the dependability of the methods employed. Then, the next part will explain the validation techniques applied to justify simulation results, including the types of measuring methods employed to generate the clearest capture of fluid flow and behaviour in the PEMFC models. The overall discussion will provide a better insight into choosing a suitable combination of simplification, validation, and measuring methods for increased quality and accuracy of future studies on fluid flow analysis.