Partial pressure calculation in fluent
 

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!

Re: Partial pressure calculation in fluent
 

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.

Re: Partial pressure calculation in fluent
 

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.

Re: Partial pressure calculation in fluent
 

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

Re: Partial pressure calculation in fluent
 

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 :D

UDF:Partial Pressure calcualtion of species in gas seperation thry membranes.
 

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

partial pressure
 

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?