# How to calculate the mass flow rate on PEMFC addon?

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 December 19, 2019, 03:46 How to calculate the mass flow rate on PEMFC addon? #1 New Member   Yves Herbartz Join Date: Dec 2019 Posts: 2 Rep Power: 0 Hey everyone, i try to simulate a PEM fuel cell with the pemfc addon (version 2019 R3). First i simulate a fuel cell with the pem tutorial and it works well. Now i changed the dimensions of the geometry (my model includes 1 channel for h2, o2, and 2 cooling channels). I think there is a problem with my inlet conditions, because i always recieve an error (floating point). Does anyone knows how to calculate the inlet massflow rate for hydrogen and oxygen?? Thanks ramakant likes this.

 January 11, 2020, 06:48 #2 Senior Member   Ramakant Gadhewal Join Date: Apr 2010 Location: Chemical Engineering,National Institute of Technology,Warangal (T.S.),India Posts: 128 Rep Power: 14 Yes I know the equation ?

February 7, 2020, 11:56
#3
Senior Member

Join Date: Apr 2010
Location: Chemical Engineering,National Institute of Technology,Warangal (T.S.),India
Posts: 128
Rep Power: 14
Quote:
 Originally Posted by ramakant Yes I know the equation ?

U (inlet)=zeta *I/nF*A(MEM)/xi*RT/P*1/A(channel)
where zeta =stoichiometryratio (Anode and cathode)
n= 2(anode) ,4 (cathode)
xi=mass fraction (Oxygen and hydrogen)
R=8.314
T=353K
P=101325pA
A(MEM)=L*B(M2)
A(CHANNEL)=L*B(M2)

I HOPE THIS WILL WORK ?

 Tags fluent, pemfc model