Water Distribution and Removal along the Flow Channel in Proton Exchange Membrane Fuel Cells

丁刚强^1,2，TANG Heqing¹，LUO Zhiping³，涂正凯³，PEI Houchang⁴，LIU Zhichun⁴，LIU Wei⁴

1. College of Chemistry and Chemical Engineering, Huazhong University of Science and Technology2. Power Battery Division, Wuhan Institute of Marine Electric Propulsion3. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology4. College of Energy and Power Engineering, Huazhong University of Science and Technology

摘 要：Distribution expressions of total gas pressure and partial water vapor pressure along the channel direction were established based on lumped model by analyzing pressure loss in the channel and gas diffusion in the layer. The mechanism of droplet formation in the flow channel was also analyzed. Effects of the relative humidity, working temperature and stoichiometry on liquid water formation were discussed in detail. Moreover, the force equilibrium equation of the droplet in the flow channel was deduced, and the critical flow velocity for the water droplet removal was also addressed. The experimental results show that the threshold position of the liquid droplet is far from the inlet with the increase of temperature, and it decreases with the increase of the inlet total pressure. The critical flow velocity decreases with the increase of the radius and the working pressure.

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