Modelling evaporation from surface of porous structure

    • d.weragoda


      I'm trying to model evaporation from the surface of a porous structure , i.e. from the porous zone to the vapour zone as shown in the figure below. 

      For this I've considered a simple 2D model with one region for the porous and the other for the air/vapour (depending upon the two cases).

      I do have a couple of question for both these cases;

      1. Is it possible to use the porous zone condition in Fluent or should the porous media be created in the cad?
      2. If a fluid flow through the porous media is to be defined, how can the interface between the porous surface (or liquid surface) and the vapour surface be defined in such a way that only vapour is allowed to escape from the interface.

      I've had a look at the user guide and the learning forum, but could find a way to do it. Is the latter even possible in fluent?

      A simple 2D representation, porous zone at the bottom and vapour zone above.


      Any thoughts and feedback on this is highly appreciated.




    • Rob
      Ansys Employee

      If you really want to create all of the tortuous paths, plates or whatever in the CAD feel free. Then mesh with good resolution. Otherwise, use the porous media, and define the cell zone in geometry for use in the solver. 

      Flow in as a liquid is fine, remaining boundaries may be open to ambient? Stopping the liquid just pouring out the other end may be the difficult part. Why would the liquid not leave the porous zone if there's enough of it? Remember fluids will always look for the path of least resistance. 

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