Numerical study on droplet transport behavior in the serpentine flow channel of PEMFC
Water management is an important method to improve the performance of proton exchange membrane fuel cells(PEMFCs).In order to solve the problem of cathode channel"flooding"in fuel cells,it is necessary to clarify the motion laws of droplets in different channel structures to find ways to accelerate droplet discharge.In this paper,two-phase numerical simulation is used to simulate and analyze the motion behaviors of droplets with different sizes,initial positions and quantities in two types of serpentine flow channel structures,focusing on the main factors affecting the droplet discharge time and droplet motion behaviors.The results show that the droplet size and the contact mode with the curved part greatly affect the droplet motion attitude and discharge time,the larger the droplet diameter,the shorter the discharge time,and the increase of the diameter effectively accelerates the inner droplet discharge.At the same time,compared with the rounded bend structure of the runner,the semicircular bend structure of the runner is more conducive to the discharge of the droplets.
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