关键词:

可视化PEMFC, 压降, 水淹, 水分布, 排水

Abstract:

A transparent PEM single cell with a single straight channel was used to investigate the liquid water transport in the cathode channel.The direct relationship between liquid water removal and pressure-drop between inlet and outlet of the channel was obtained.A diagnostic method was developed to evaluate liquid water accumulation and removal in the channel by combining visualization and pressure-drop measurement.With the increase in humidification temperature, the region of liquid water extended from the lower part of the channel towards the inlet.For a given flow channel, there was a specific velocity, at which the droplet critical diameter was comparable with the channel size and liquid water accumulation in the channel was the highest.Under the study conditions, the specific velocity was 2 m·s^-1.To discharge the liquid water in time, gas velocity should not be lower than 3 m·s^-1.

Key words:

可视化PEMFC, 压降, 水淹, 水分布, 排水