Mass Source Terms in Multiphase FLUENT
I am currently working on modelling a multiphase flow system in FLUENT with water as the primary phase and two phases for air (which are differentiated by bubble size) . I am trying to model mass transfer between the two phases of air using user-defined functions (UDFs).
My first question: Is there a difference between modeling mass transfer terms through the Phase Interaction menu as opposed to applying source terms to the two air phases in the Cell Zone Conditions menu? Is either version preferable to the other?
Second question: I know that these two different methods result in a slightly different writing for the UDFs (different macros: Define_Mass_Transfer vs. Define_Source). However, when using the source term method, I had two source term UDFs (1 UDF for each group). But if I apply mass transfer terms through the Phase Interaction menu, do I need only 1 mass transfer mechanism that acts as the net sum of mass transferred from group 1 air bubbles to group 2 air bubbles?
Thanks for all your help!