[Aliset1236]

Hi
I am trying to plot I-V curve for fuel cell is there any one who can help me in this respect

[A CFD free user]

Hi Buddy,
It's an easy work. Impose the appropriate value for voltage on cathode wall terminal and calculate the corresponding current density. You need to do the same procedure for a few points. Then plot the values. Just keep in mind that, start from a voltage near to open circuit voltage and decrease it as e step function.
I hope it helps

[Aliset1236]

dear sir
Thank you very much
1-But why I should start from Open circuit voltage
2-what do you mean by"Just keep in mind that, start from a voltage near to open circuit voltage and decrease it as e step function.

[A CFD free user]

Originally Posted by Aliset1236

dear sir
Thank you very much
1-But why I should start from Open circuit voltage
2-what do you mean by"Just keep in mind that, start from a voltage near to open circuit voltage and decrease it as e step function.

It turns out you didn't take my points. I meant, to plot a I-V curve, you need to do simulation at least for a few points, right? For instance, let say V=0.9, 0.8,0.7,0.6,0.5, 0.4 , ...
So, you must calculate the corresponding current density, respectively. By saying the above statement, I meant that you start from 0.9 (near to Open circuit ) and obtain its current density, and then go to 0.8 and obtain the current density for this too and so forth. As you see, it's like a step function with magnitude of 0.1.

[razika]

please. any one can tell me about ploting cell potential curve versus current density (V-I). what is the relation between thses two entity? and how can I plot it in fluent 6.3
sincerly.

[A CFD free user]

Originally Posted by razika

please. any one can tell me about ploting cell potential curve versus current density (V-I). what is the relation between thses two entity? and how can I plot it in fluent 6.3
sincerly.

Hi,
it's not a difficult thing. To plot a current-voltage (I-V) in Fluent, you only need to specify one of these two mentioned properties as BC at cathode wall terminal, (potentiostatic or galvanostatic). Let's say that you select potentiostatic, it means that you prescribe the value of voltage at cathode and receive the report calculated value of current density in Fluent console. You got the current density for a specific potential. Now, you need to repeat the same strategy for the next value of voltage. Performing this in a range of values, lets say voltages between 0.9 to 0.2, you got the corresponding values of current density and there you go, your current density vs voltage curve is ready to plot. It's straightforward and facile.

[yun1ksu]

Thank you so much I've been looking for this.