OpenFOAM: CO2 flow boiling simulation yielding wrong pressure drop
 

Hi everyone,

I am running a CO2 microchannel flow boiling simulation on OpenFOAM. The only experimental data that I have is the pressure drop on a certain length of that pipe but whatever I change with the setup dp stays around the same value. The fluid properties are set at 15 degC saturation. Both the gas and fluid properties are set at saturation and it seems valid because the temperature stays around the saturation temperature and pressure in the channel. I have made sure that the B.C. and properties are correct but still dp is off by far. I need to have a dp of 0.04 bar and I'm getting something around 0.02 bar.
I am using k-e as a turbulence model, and I have run a mesh sensitivity analysis, with both the coarse, medium and fine mesh I get the same value (approximately). The solver used is reactingTwoPhaseEulerFoam.

Does anyone have any clue what could be the problem?

Thanks guys!