Abstract
The purpose of this study is to quantitatively measure water droplet behavior inside the cathode channel of a polymer electrolyte fuel cell in order to elucidate its influence on cell performance characteristics. Water droplets emerging from the surface of the gas diffusion layer in a single cell channel model were visualized ex-situ using fluorescent particles contained in the droplets and their motion was measured by particle trajectory velocimetry. The pressure in the channel was also measured with high-accuracy pressure sensors. As a result, the emerging frequency, instantaneous traveling velocity and equivalent diameter of the water droplets and the internal flow conditions in the channel were quantitatively measured as a function of the supplied air and water flow. The data obtained with the high-accuracy pressure sensors showed that water droplet behavior correlated well with the flow conditions.
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