evaporation-condensation model: 2D simulation of thermosyphon (closed-domain)
I'm using ANSYS Fluent 2019R1 to model a 2d thermosyphon (closed-domain). I'm planning to simulate simultaneous evaporation (of water) and condensation (of vapor) inside this 2d tube. I have the case setup and running without any problems.
However, I have a few questions regarding general procedure and Lee's model implementation in Fluent as the theory guide section dedicated to the Lee's model doesn't answer my question. The geometry and initial condition of water phase volume fraction is as follow:
- Operating pressure location and reference pressure location
Due to the fact that the domain is closed, non of the boundaries fixes a value for pressure and thus a reference pressure level needs to be set. I have set the operating pressure location to (0, 0.2m). However when I initialize the simulation the following TUI command doesn't return any value and I can't check the actual location of the reference pressure:
define -> operating-conditions -> used-ref-pressure-location
Does fluent use reference pressure for this kind of simulations?
- Lee's evaporation and condensation model
The theory guide section only describes the volume fraction formulation and its corresponding source term when the model is used. How the pressure and energy equations are modified when Lee's model is used? Do they include source terms due the mass transfer and latent heat during evaporation-condensation? It would be really helpful if you modify the theory guide section and provide both the modified pressure and energy equations.