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-   -   liquid film separation (http://www.cfd-online.com/Forums/fluent/101774-liquid-film-separation.html)

Feanor4ik May 14, 2012 03:55

liquid film separation
 
1 Attachment(s)
Hello, I'm trying to model separation of liquid film from the surface through the slit. Principal scheme is shown.
What kind of multiphase model and boundary conditions type should I use?

http://www.cfd-online.com/Forums/att...1&d=1336982067

delaneyluke May 15, 2012 01:43

Use the VOF multiphase model.
At the inlet give the height of the water column, and specify volume/mass fractions at the outlets.

Regards
Luke

Feanor4ik May 15, 2012 05:27

Quote:

Originally Posted by delaneyluke (Post 361099)
Use the VOF multiphase model.
At the inlet give the height of the water column, and specify volume/mass fractions at the outlets.

Regards
Luke

Thanks for the advice, but VOF model is not suitable, because phases must have different velocities (not 0 m/s).

Yours faithfully
Vitaliy

delaneyluke May 15, 2012 05:40

Then you would probably have to use the Eulerian model where a separate momentum eqn is solved for each phase.

Regards
Luke

Feanor4ik May 15, 2012 05:58

Quote:

Originally Posted by delaneyluke (Post 361135)
Then you would probably have to use the Eulerian model where a separate momentum eqn is solved for each phase.

Regards
Luke

I tried this model, but in few iterations i got "Divergence detected". May be it is connected with the type of BC that I used? I used pressure-inlet and pressure outlet BC.
Besides, should I set volume fravtion distribution on inlet by simple profile or using UDF?

Yours faithfully,
Vitaliy

QustFelix May 26, 2012 02:25

This is an very interesting subject. In fact ,I am doing some works about liquid films now,but I am not sure wether fluent can model this sort of problems or not,because the magnitude of thickness of liquid film maybe too tiny to meet the continuum fluid mechanics .But I am not sure about this,I am inverstgating about this. Before this I am using a software named Surface evolver .
Hope you can get an answer .

Regards
Felix

alma February 5, 2013 16:17

Modeling droplet by surface evolver
 
Does anyone have experience with droplet simulation by surface evolver?


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