Abstract
Only the water drop discharged on the channel surface has been observed at this laboratory. Therefore, it was difficult to observe the internal situation of the gas diffusion layer which diffuses reactive gas. It was found in the past research that generated water moved from a pore to a bigger pore in GDL their influence on. In this research, the porosity and thickness of GDL were varied in the in-situ experiments, and the discharge of water droplets and power generation performance were investigated. As a result, as the porosity varied in condensation conditions, because the stoma distribution inside GDL differed. The discharge behavior of water changed. Since water would be sucked up for the direction of a thick thing by the action of capillary-tube pressure if what has thin thickness is compared with a thick thing, it becomes difficult to produce flooding and the improvement in the engine performance was found.
