Phase change material inside a Pipe flow

Hi all,

I need to simulate a phase change material inside a pipe flow (liquid -> gas). So, the transformation is isothermal. I would like simulate the cooling of a concrete slab with a heat exchange pipe. The gas in outlet is slightly superheated, so maybe the solution would be to add a phase change material into the Non-Isothermal Pipe Flow module? What kind of physics would you recommend me to use?

Thank you in advance
Yann