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Partial pressure calculation in fluent

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Old   February 4, 2008, 15:04
Default Partial pressure calculation in fluent
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Priya
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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!
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Old   February 5, 2008, 04:50
Default Re: Partial pressure calculation in fluent
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BG
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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.
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Old   February 5, 2008, 11:51
Default Re: Partial pressure calculation in fluent
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Priya
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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.
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Old   February 5, 2008, 12:55
Default Re: Partial pressure calculation in fluent
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PKN
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probably, we can use molecular Weight to convert mass fraction to molar fraction....
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Old   February 7, 2008, 15:42
Default Re: Partial pressure calculation in fluent
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Priya
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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
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Old   December 5, 2010, 15:03
Default UDF:Partial Pressure calcualtion of species in gas seperation thry membranes.
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Azharuddin
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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
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Old   May 29, 2011, 11:03
Default partial pressure
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sabrine
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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?
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