A separation of a multicomponent mixture

CFXILMENAU · December 4, 2018, 10:39

Hi, guys.

I am simulating a centrifuge which is full of air. Original oxygen concentration is 21%. My goal is to increase the oxygen concentration at the wall of the centrifuge, theoretically 25% or 26%, cause O2 is heavier than N2. But I don't know how to get the mass fraction of O2 at the wall of the centrifuge. Do I have to write a Expression to post the properties of O2?Do I need to add a monitor point in output control？

I have already done the CFX-Pre with multicomponent O2 and N2 with fixed composition mixture.

Could anyone help me with this problem？

I truly appreciated your help in advance.

ghorrocks · December 4, 2018, 18:04

This looks like a duplicate of another thread (Get the properties of the components in multicomponent simulation). Please do not start a new thread on an identical topic.

CFXILMENAU · December 5, 2018, 04:11

Quote:

Originally Posted by ghorrocks

This looks like a duplicate of another thread (Get the properties of the components in multicomponent simulation). Please do not start a new thread on an identical topic.

hello，this simulation is is different from others.
so do you have any advice ?

ghorrocks · December 5, 2018, 05:19

These issues are all discussed on the other thread. To save you some reading:

* CFX does not have a built-in model for the separation of a multicomponent mixture by gravity, accelerations or rotations. If you are going to model it you are going to have the develop the source term to do it yourself. This is not simple.
* It is a CEL variable, something like O2.mass fraction. Read the CFX-reference guide for the full description.

December 4, 2018, 18:04		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,917 Rep Power: 145	This looks like a duplicate of another thread (Get the properties of the components in multicomponent simulation). Please do not start a new thread on an identical topic. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

December 5, 2018, 05:19		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,917 Rep Power: 145	These issues are all discussed on the other thread. To save you some reading: * CFX does not have a built-in model for the separation of a multicomponent mixture by gravity, accelerations or rotations. If you are going to model it you are going to have the develop the source term to do it yourself. This is not simple. * It is a CEL variable, something like O2.mass fraction. Read the CFX-reference guide for the full description. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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