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Species Partial Pressure or Mole Fraction

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Old   July 24, 2006, 12:43
Default Species Partial Pressure or Mole Fraction
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Hi Guys,

I am working on a Fuel Cell model and want to know if there is a way to calculate the individual species PARTIAL PRESSURE or MOLE FRACTION in a cell. I am trying to use the DEFINE_SOURCE macro to calculate the Nernst potential (which uses the partial pressures) and the volumetric heat generation thereby.

Is there a way to use the MASS FRACTION to find the Mole fraction of the species..?? Because the Fluent manual has the macro C_YI(cell,thread,i) to access the species mass fraction.

Looking forward to your suggestions.

Thank you

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Old   July 25, 2006, 00:15
Default Re: Species Partial Pressure or Mole Fraction
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Ideal gas law:

p_i= UNIVERSAL_GAS_CONSTANT*C_T(c,t)*C_R(c,t)*C_YI(c,t, N_i)/Mw_i

p_i = partial pressure, Mw_i = molecular weight of specie i

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Old   July 25, 2006, 09:21
Default Re: Species Partial Pressure or Mole Fraction
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Thanks RoM, I'll try it out right away.
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