Build and inspect an ideal Water/Ethanol flash

Use a structured BioSTEAM spec with explicit ideal thermodynamics and compare the phase split with the public contract test.

1. Build the structured flash

json

{
  "id": "ideal_flash_probe",
  "thermo": ["Water", "Ethanol"],
  "thermo_model": "ideal",
  "streams": [{
    "id": "feed",
    "flows": {"Water": 50, "Ethanol": 50},
    "units": "kmol/hr",
    "T": 363.15,
    "P": 101325
  }],
  "units": [{
    "type": "Flash",
    "id": "F1",
    "ins": ["feed"],
    "outs": ["vapor", "liquid"],
    "params": {"T": 363.15, "P": 101325}
  }],
  "attach_tea": false
}

Pass this object to build_system_from_spec. Explicit thermo_model = ideal installs ideal activity and fugacity coefficients for a transparent Raoult-law benchmark.

2. Inspect VLE

text

get_vle_results(result_id=..., stream_id="feed", pressure_Pa=100000)

The public contract test requires Water/Ethanol components, a 0.5 Water liquid mole fraction at the bubble calculation basis, and a bubble temperature between 350 and 370 K.

3. Check the flash phase split

text

get_stream_results(result_id=..., stream_id="vapor")
get_stream_results(result_id=..., stream_id="liquid")

Quantity	Qualified value
Vapor fraction β	0.7219168857
Water mole fraction in vapor	0.4450775696
Water mole fraction in liquid	0.6425812206

These values are frozen software-contract values from the public 0.4.1 test suite. They verify the ideal-thermo wrapper path, not the fidelity of ideal thermodynamics for a real Water/Ethanol separation.

4. Dispose the stored result

text

dispose_result(result_id=...)