Steam-jet vacuum ejector (thermocompressor)

A steam-jet ejector holds vacuum on a vacuum-distillation overhead with no moving parts: high-pressure motive steam (16 bar) expands through a nozzle to a supersonic jet (~1100 m/s) that entrains the low-pressure suction vapor (0.1 bar), and the combined flow is recompressed in a diffuser to the 0.25 bar discharge. It reports the mass entrainment ratio ω = suction/motive (the ejector's defining performance number), the maximum ω it can sustain at this discharge pressure, and whether the duty is feasible (ω below ω_max, with margin here). Honest scope: geometry-free 1-D thermocompressor model (ideal-gas γ, lumped nozzle/mixing/diffuser efficiencies, no normal-shock/area detail).