Hello All,

I have Species reaction taking place in a fuel cell volume and would like to calculate the partial pressure for each individual species (essential for calculation of nernst potential.) Any suggestions ??

Thank you!

Partial pressure is (molar fraction)*(absolute pressure), both are Fluent field functions available for processing. You can do it automatically with a custom field function.

Thanks BG! But is there a macro that can be used to get the molar fraction. My partial pressure term is part of a UDF and I need to calculate it at every iteration. I know that C_YI(c,t,i) is used for mass fraction, but I could not find one for molar fraction.

probably, we can use molecular Weight to convert mass fraction to molar fraction....

Thank you guys for the help. I used the mass fraction and molecular weight to get to the partial pressures and I think it worked well

[azharuddin0613]

I'm solving a case for gas seperation through membrane in which i need to calculate the partial pressure of each species as permeation is depended on partial pressure in my case. To calculate my mass flux rate thru membrane I need partial pressure.

Can anybody help me in calculating partial pressure of species thru UDF.

thanks a ton

I'M IN URGENT NEED OF IT, PLZ HELP

[sabrine]

I have a surface aerated stirred tank. I need to calculate the volumetric mass transfer coefficient Kla. Is there any way to determine the partial pressure of the air incorporated in the water knowing that there is always a quantity non incorporated of air above the surface? Otherwise how can i just know the concentration of the air incorporated in the water using Fluent?