I am trying to execute a two-phase flow numerical analysis of refrigerant in a capillary tube in ANSYS Fluent software. The base fluid is air and refrigerant is Chloroacetaldehyde (C2H3Cl). Although the simulation is converged, however, the temperature and pressure profile is unphysical. The pressure is linearly decreasing and the temperature is constant. It seems the phase is not changing and the profiles are like the single-phase analysis. I am using pressure inlet boundary condition and pressure outlet boundary condition and adiabatic wall. What might be the problem and how can I solve it. I want your kind suggestion. Thanks in Advance.