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Ansys Learning Forum › Forums › Discuss Simulation › Fluids › Mass Issues with Mixture Multiphase and Species Transport › Reply To: Mass Issues with Mixture Multiphase and Species Transport

March 12, 2024 at 7:48 pm
Nicholas Strack
Subscriber

 

 

Ahmed,

Firstly, thank you for the response!

My internal volume is 1.953E-5 m^3 and just looking at the so2-liquid component, which makes up 0.594 of the overall mixture mass and a density of ~1200, this gives me 13.9g. If I check the acetonitrile-liquid component, 0.228 and ~786 for mass fraction and density, I get 3.5g. I am taking mf*Density*volume. These values are also in rough agreement with some real values from a manufacturer.

I am a little perplexed by this problem. Side note, for the materials, the liquids are defined with constant density and the vapors are defined as real-gas-peng-robinson as I am working with temps and pressures near the critical point.

I would think Fluent is using the Peng-Robinson EOS to determine the density for the vapors and taking the constant density values listed above for the liquids and performing a similar calculation, but I cannot understand how it is coming up with a value so far off. 

Any additional ideas you can give me would be appreciated!

 

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