I constructed my flow map regime based on Taitel and Duckler transition equations for vertical upward flow. The pressure is 2MPa and density of 25kg/m3 for an ideal gas and water, t = 30 deg C, pipe dia = 0.21m. Flow maps with these properties don't exit. See below. The circled triangular in the annular flow regime is what i am using to run the simulation. I believe i didn't obtain full annular because the entrance length wasn't long enough. Though it was annular during the first 10,000 iteration before mixing
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