[mvee]

Hi

I am using a Paper "Bio-inspired flow field designs for polymer
electrolyte membrane fuel cells" published in Elsevier - Hydrogen Energy Journal (2014). I am facing problem with the inlet mass flow rate boundary conditions.

The stoichiometric ratio for anode and cathode mentioned was 2. With the back calculations I calculated the inlet mass flow rates.
Also, few other parameters were assumed; porosity for catalyst assumed same as the GDL and electrolyte conductivity assumed to be 17 s/m

I have tried almost everything to validate my results but not getting the proper match with polarization curve in literature. I have attached the comparison of current simulation with experiment for polarization curve. There is no or little change in current with decreasing the voltage value.

Please tell me about,
(1) Could anyone tell me the exact problem with this?
(2) I suspect Boundary conditions. What are the correct boundary conditions?

Any suggestions are welcome!

Thank you in advance

Regards
Mvee

[ramakant]

Originally Posted by mvee

Hi

I am using a Paper "Bio-inspired flow field designs for polymer
electrolyte membrane fuel cells" published in Elsevier - Hydrogen Energy Journal (2014). I am facing problem with the inlet mass flow rate boundary conditions.

The stoichiometric ratio for anode and cathode mentioned was 2. With the back calculations I calculated the inlet mass flow rates.
Also, few other parameters were assumed; porosity for catalyst assumed same as the GDL and electrolyte conductivity assumed to be 17 s/m

I have tried almost everything to validate my results but not getting the proper match with polarization curve in literature. I have attached the comparison of current simulation with experiment for polarization curve. There is no or little change in current with decreasing the voltage value.

Please tell me about,
(1) Could anyone tell me the exact problem with this?
(2) I suspect Boundary conditions. What are the correct boundary conditions?

Any suggestions are welcome!

Thank you in advance

Regards
Mvee

Dear

You can calculate the inlet mass flow rate or inlet velocity by using the following equations
Mass flow rate =stochiometry *I_ref/nf*Amem*R*T/P*1/Ach*1/xi