[fatchang]

Hi guys,

I am using the PEMFC module to simulate a pemfc with the single serpentine flow field. In the figures, the water saturation and water content in channels and gdls are 0, which means there is no liquid water and water vapor. However, the mass fraction of water is bigger than 0. So, I am confused.

I have done these things:

1. enable the multiphase in PEMFC panel;

2. set the Realitve Humidity to 100% by adjusting the species mole fraction at the inlets.

3. set the solution zones of UDS 2 and 3 as all zones, which enables the water saturation and water content for simulation.

pic1: Contours of Static Pressure. (channel_cathode)
pressure of ch_c.jpg

pic2: Contours of mass fraction of H2O.(channel_cathode)
mass fraction of water ch_cathode.jpg

pic3: Contours of water saturation. (channel_cathode)
water saturation of ch_c.jpg

pic4: Contours of water content. (gdl_cathode)
water content of gdl_c.jpg

pic5: Contours of mass fraction of H2O (gdl_cathode)
mass fraction of water gdl_c.jpg

My first question is whether I set the parameters incorrectly. Then, you can see that the mass fraction of water is bigger than 0 (pic.5), but the water content is 0(pic.4). Is it possible that I set the contours for UDS incorrectly?
The third question is what else I need to do if I want to get liquid water(water saturation>0) in the channel and gdl.

Look forward to your reply!

Qichang