[loke]

Hi there,

I am new to fluent but I have been told that the software could be used to predict how a solvent would evaporate into the air. In my case, I would like to see how an open reactor containing a solvent would behave in a room were there is first no extraction and second an extraction. The idea is to predict the concentration of the solvent in the air around the reactor.

Could anyone help me with this? or point me toward a tutorial?

Thanks for any help,

Loke

[loke]

No one?
Is that even possible? I am not a fluent user but have access to the software during summer break and I'd love to perform that calculation.

I meshed a 2D surface that looks like:
______
|xxxxxx|
|xxxxxx|
|xxxxxx|
---|_|---

The line in red acting as the inlet of solvent.
x is the interior (air)

Could someone guide me towards the best parameters to use in Fluent?
Or a tutorial, guidelines...?

Thanks again,
Loke

[maitray]

Originally Posted by loke

No one?
Is that even possible? I am not a fluent user but have access to the software during summer break and I'd love to perform that calculation.

I meshed a 2D surface that looks like:
______
|xxxxxx|
|xxxxxx|
|xxxxxx|
---|_|---

The line in red acting as the inlet of solvent.
x is the interior (air)

Could someone guide me towards the best parameters to use in Fluent?
Or a tutorial, guidelines...?

Thanks again,
Loke

Listen mate, here’s a quick guide
1.) use eulerian multiphase model
2.) in material selection , add 2 material, one for liquid and one for gas phase and put suitable properties like viscosity density etc. you also need the enthalpy for phase change.
3.) for phase interaction, choose mass, and cavitation mechanism, (**this step could be wrong**)
4.) now solution initialisation could be challenging , if you have separate cell zones for solvent and air, then just put phase 1 volume fraction =1 for solvent, and patch 0 for air (*watch any video for this one*) . If you have a single part, then you need to register cells and watch video for this process also*)

I am assuming that you have experience in fluent. Well if you don’t have then i can do that for you.

[loke]

Thank you Maitray.
I will try that and come back with the result.

[loke]

Update:

I meshed this to easily patch the solvent zone:

______
|xxxxxx|
|xxxxxx|
|xxxxxx|
---|x|---
---|s|---
---------

x = air
s = solvent

I tested different models including the one suggested.
Something plausible (?) comes out of the multiphase/mixture model, including 3 phases (air, solvent liq and solvent vapor) and mass transfer (solvent liq -> solvent vapor) with the evaporation/condensation model.

Initialization is done including patching for the solvent liquid area.

For a first test, boundaries are walls. I would like to change that to something like outlet_pressure (?) to simulation an infinite open space that can renew the air.

However after some time steps, the solvent liquid area always increase and overflow into the air area...

Any idea?
- what setup should I use to simulate the open space?
- what am I doing wrong?

Thanks in advance!

[loke]

There must be something I am missing...

What kind of phase interaction do you suggest?
It seems that nothing goes into the vapor phase when you look at the result.

EDIT:

To observe a transition from the liquid phase to the vapor phase, I have to use the boiling temperature of the solvent as saturation temperature in the mass transfer window. I would like to simulate natural evaporation at room temperature...

Anyone to help me out here? I am confused at this point :-)