# liquid film separation

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May 14, 2012, 03:55
liquid film separation
#1
New Member

Vitaliy
Join Date: Sep 2011
Posts: 5
Rep Power: 5
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?

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 May 15, 2012, 01:43 #2 Senior Member   Join Date: Mar 2009 Location: Indiana, US Posts: 185 Rep Power: 8 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

May 15, 2012, 05:27
#3
New Member

Vitaliy
Join Date: Sep 2011
Posts: 5
Rep Power: 5
Quote:
 Originally Posted by delaneyluke 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

 May 15, 2012, 05:40 #4 Senior Member   Join Date: Mar 2009 Location: Indiana, US Posts: 185 Rep Power: 8 Then you would probably have to use the Eulerian model where a separate momentum eqn is solved for each phase. Regards Luke

May 15, 2012, 05:58
#5
New Member

Vitaliy
Join Date: Sep 2011
Posts: 5
Rep Power: 5
Quote:
 Originally Posted by delaneyluke 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

 May 26, 2012, 02:25 #6 New Member   Felix Join Date: Feb 2012 Location: Qingdao,China Posts: 5 Rep Power: 5 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

 February 5, 2013, 16:17 Modeling droplet by surface evolver #7 New Member   Join Date: Feb 2013 Location: USA Posts: 1 Rep Power: 0 Does anyone have experience with droplet simulation by surface evolver?

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