Cryogenic Two-Phase Flashing Flow Calculator
Calculate flash gas vapor mass fraction (x), volume expansion ratio, and two-phase mixture velocity across cryogenic valves and depressurizing pipes.
Inlet Conditions & Depressurization
Flashing Vapor & Two-Phase Dynamics
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Frequently Asked Questions
What causes flashing in cryogenic liquid lines?
When saturated cryogenic liquid undergoes a pressure drop across a valve or restriction, its boiling point drops immediately. Sensible heat in the liquid vaporizes a fraction of itself to self-cool down to the new saturation temperature.
Why is void fraction (volume % gas) so high despite low vapor mass quality?
Because cryogenic vapor density is roughly 100 to 700 times lower than liquid density, a vapor mass fraction of just 5% (x = 0.05) creates a two-phase mixture that is over 95% gas by volume.
What is the danger of high two-phase velocity in cryogenic lines?
Mixture velocity accelerating beyond 20ā30 m/s causes sonic choking, high-frequency acoustic vibration, slug flow momentum hammer, and severe erosion of valve seats.