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The setting for the multiphase phase change is given below:

Note that the inlet velocity (from the protruding tube) where the liquid ammonia enters the water column is 5.2 m/s. Initial ammonia temperature is -33.4 C. Inlet diameter and distance between the water surface (top of the domain) and inlet tube are 0.2 m and 4 m, respectively.

Additional variables for force setup:

Surface tension NH3 liquid-NH3 vapor 0.021 N/m
Surface tension NH3 liquid-water 0.041 N/m
Surface tension NH3 vapor-water 0.072 N/m