Evaporation condensation below saturation temperature in FLUENT

- January 11, 2020 at 5:16 am
  
  Paul321
  Subscriber
  
  Hi. I am trying to model evaporation and condensation of water in a closed container at a temperature below the saturation temperature (say 90°C). When I use evaporation-condensation as the mass transfer mechanism between liquid and gas phase with of any multiphase model of FLUENT it asks for the saturation temperature. If a saturation temperature of 100°C is assigned, there is absolutely no vapour formation till the water temperature reaches 100°C. Once it reaches the saturation temperature, the water boils off from the bulk. But absolutely no evaporation is observed below the saturation temperature which is not the real case scenario. Please help me regarding how this model of below saturation temperature evaporation can be implemented in any multiphase model of FLUENT. I am using FLUENT 19.2. Solution with any of the previous versions is also appreciated.
- January 11, 2020 at 8:05 am
  
  DrAmine
  Ansys Employee
  
  For vaporization which is evaporation below saturation temperature you require the presence of other component and the mass transfer is concentration or partial pressure driven.
- January 11, 2020 at 8:25 am
  
  Paul321
  Subscriber
  
  Thanks Amine. So which particular module will be suitable in FLUENT for this? Can you please refer me some tutorial for the same?
- January 11, 2020 at 8:34 am
  
  DrAmine
  Ansys Employee
  
  No tutorial available but examples on customer portal. For mass transfer either UDF or species mass transfer can be used . You can further change the sat temperature to correspond to the temperature at which partial pressure corresponds to absolute pressure. Now happy weekend.
- January 11, 2020 at 8:38 am
  
  Paul321
  Subscriber
  
  Thanks a lot for the help. I will go through these options!