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Gas separation with a tube membrane
Posted Mar 22, 2013, 6:54 a.m. EDT Computational Fluid Dynamics (CFD), Chemical Reaction Engineering Version 4.3 1 Reply
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Dear everyone, I am working on modeling of a tube membrane.
1, the inlet of the tube membrane is pure CO2, and O2 comes from the wall (membrane), so at the outlet you will have a mixture of O2 and CO2, and O2 mole fraction at outlet can be as high as 0.5.
2, I chosen "laminar flow" model and "transport of concentrated species" to simulated this.
The problem I am facing now is that the influence of O2 on the fluid field is much smaller than I expected.
For example, the flow rate at inlet (integration by spf.U*2*Pi*r, 2D axisymmetric) is 100 and O2 mole fraction is 0; At outlet, where is O2 concentration is 0.5, the flow rate is only 115, but I expect it to be 150, I am really confused by this, and I hope someone can help me.
1, the inlet of the tube membrane is pure CO2, and O2 comes from the wall (membrane), so at the outlet you will have a mixture of O2 and CO2, and O2 mole fraction at outlet can be as high as 0.5.
2, I chosen "laminar flow" model and "transport of concentrated species" to simulated this.
The problem I am facing now is that the influence of O2 on the fluid field is much smaller than I expected.
For example, the flow rate at inlet (integration by spf.U*2*Pi*r, 2D axisymmetric) is 100 and O2 mole fraction is 0; At outlet, where is O2 concentration is 0.5, the flow rate is only 115, but I expect it to be 150, I am really confused by this, and I hope someone can help me.
1 Reply Last Post Mar 25, 2013, 7:03 a.m. EDT
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Posted:
1 decade ago
Can anyone help me?