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• W2801258576 abstract "Proper water management in proton exchange membrane fuel cells (PEMFCs) remains a challenge, hindering the commercialization of this technology. Liquid water emerges in the form of droplets from micrometer-scaled pathways of porous gas diffusion layers (GDLs) into millimetre-scaled gas flow channels. Afterward, droplets grow to certain critical sizes before being removed by the convective gas flow. The opaque nature of fuel cell components, including GDL materials, poses significant challenges to understand droplet dynamics and develop more efficient water management techniques. In this work, an advanced synchrotron X-ray radiographic imaging technique available at the Canadian Light Source (CLS) was employed to visualize time dependent droplet behaviour in a serpentine PEMFC flow channel for the first time. High spatial and temporal resolution coupled with high energy photons of an X-ray beam provided high resolution images of growing droplets. From the captured images, the whole growth cycle of liquid droplets was obtained under various gas flow rates. A cyclic pattern of droplet dynamics including emergence, growth, and detachment was visualized from high resolution images. From the X-ray images, the time-evolution of dynamic contact angles, height, and chord of a growing droplet was quantitatively analyzed. At higher gas velocities, the critical detachment diameter of droplets became smaller and contact angle hysteresis was found be lower, while larger contact angle hysteresis and bigger droplets were observed at lower gas velocities. The critical droplet size at which the detachment of droplets occurred was compared to the predicted results from an analytical approach and good agreement was found." @default.
• W2801258576 created "2018-05-17" @default.
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• W2801258576 date "2018-10-01" @default.
• W2801258576 modified "2023-10-13" @default.
• W2801258576 title "Investigation of time dependent water droplet dynamics on porous fuel cell material via synchrotron based X-ray imaging technique" @default.
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• W2801258576 doi "https://doi.org/10.1016/j.expthermflusci.2018.04.021" @default.
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