diphasic or DPM model ?

- May 13, 2022 at 9:11 am
  
  manelaero2020
  Subscriber
  
  Hi friends ;
  I will model the following simulation in fluent :
  we have a humid upstream flow ( air + vapor of water ) that will pass through a water separator filter
  the objective is to determine the efficacity of the water separator, thus determining which amount of water droplets are captured in the filter
  Which model should I use in fluent? (DPM or diphasic model? ) if diphasic model, wich one please ? )
  I am very thankful
  Best regards
- May 13, 2022 at 10:11 am
  
  Rob
  Forum Moderator
  
  Not as easy as it sounds. Vapour is a gas so won't get picked up by most filters. Assuming a low droplet volume fraction, DPM is the best option. However, you then need to figure out the filter: do you want to trap a percentage, anything over a certain size etc? Unless you model every fibre/filament/plate in the filter we can't tell you the separation efficiency. What we would use CFD for is to figure out what gets to the filter, where it arrives and how quickly.
- May 13, 2022 at 11:50 am
  
  manelaero2020
  Subscriber
  
  Hi I want to see basicaly how water behaves inside the filter
  So , do you think Wet steam model is most suitable than DPM MODEL?
  THANK YOU
- May 13, 2022 at 12:27 pm
  
  Rob
  Forum Moderator
  
  No. Water vapour or water droplets? If you want to capture what's going on inside the filter you'll need to create the fibre/foam/whatever geometry: good luck. There's a reason everyone uses porous media....
- May 13, 2022 at 1:28 pm
  
  manelaero2020
  Subscriber
  
  Water vapor will condensate inside the filter , that is the problem that i modelize , What do you think ? Which model ? Wet steam ? I think DPM is more suitable for water droplets
  I am sorry if i wasn't clear
- May 13, 2022 at 2:25 pm
  
  Rob
  Forum Moderator
  
  Condensation onto micro fibres? I'd be looking at wall film, and maybe Eulerian for the phase change and a species model for the air+vapour mixture. But, big but, how do you plan on building the filter geometry?
- May 13, 2022 at 3:23 pm
  
  manelaero2020
  Subscriber
  
  Thank you , a geometry such like cyclonic filtration
  Filtration by a wirling flow , may be
- May 13, 2022 at 3:27 pm
  
  manelaero2020
  Subscriber
  
  I am not sure that cyclonic filtration works for water vapor , i will try to see that
- May 13, 2022 at 4:10 pm
  
  Rob
  Forum Moderator
  
  Not really, to strip out a vapour you need to cool it.

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