[dombastien]

Hello, im looking for a major help on ansys fluent. Im trying to simulate a water flow (droplet) that come from the top of a vertical tube (2D). I also have an air flow that come from the bottom of the tube. I need mass transfer (evaporation) in my model. My water inlet need to be my air outlet but It seem impossible on fluent. The water has a temperature of 60 degree celcius and the air 22 degree celcius. I have been trying from my own and looking on google for any tips but nobody seems to have tried these type of model before. Help me please.

[vinerm]

What are the diameters for the duct and water droplets? And what volume fraction is water supposed to occupy?

[dombastien]

Originally Posted by vinerm

What are the diameters for the duct and water droplets? And what volume fraction is water supposed to occupy?

The pipe as a diameter of 1 inches and the water droplets 3 mm. I want 35% of water.

[vinerm]

35% is a rather high value for the volume fraction of water. Water will not retain the morphology and become a slug or jet. Are you sure it is volume fraction and not mass fraction?

[dombastien]

Originally Posted by vinerm

35% is a rather high value for the volume fraction of water. Water will not retain the morphology and become a slug or jet. Are you sure it is volume fraction and not mass fraction?

Ya my bad, I was meaning mass fraction. In detail I need to simulate the flow in a fill of a cooling tower. Im starting with a simple vertical tube. The water flow (droplet) is coming from a sprinkler.

[vinerm]

In that case, it is rather run-of-the-mill simulation. You need to use DPM with droplets. Search online with keywords DPM, Droplet, Evaporation, Wet scrubber.

[dombastien]

Originally Posted by vinerm

In that case, it is rather run-of-the-mill simulation. You need to use DPM with droplets. Search online with keywords DPM, Droplet, Evaporation, Wet scrubber.

Good, but do you have any tips for my air inlet? My air inlet is my water outlet too and my water inlet is my air outlet too? An inlet-outlet dont seem to work on fluent.

[vinerm]

If water volume fraction is less than 10-12%, then water is not to be treated as continuous fluid, rather as dispersed fluid tracked using Lagrangian Reference Frame. With that, bottom will be inlet and top will be outlet, both for air. Droplets will be injected from top using surface injection and escape through the bottom. These will be setup under DPM tab for both inlet and outlet once DPM is enabled and injection is setup.