Two-Phase Flow Calculator
Calculate flow regimes, void fraction, and pressure drop for gas-liquid systems
Flow Rates
Pipe Geometry
0° = horizontal, +90° = vertical up, -90° = vertical down
Fluid Properties
Typical Values
- • Air: ρ=1.2 kg/m³, μ=1.8×10⁻⁵ Pa·s
- • Water: ρ=1000 kg/m³, μ=0.001 Pa·s
- • Water-air: σ=0.072 N/m
Flow Regime: Annular
Annular flow - liquid film on wall, gas core
Key Results
Void Fraction (α)
100.0%
Gas volume fraction
Quality (x)
20.00%
Gas mass fraction
Total Pressure Drop
106.95 kPa
Over 100 m
Pressure Gradient
1.069 kPa/m
Per meter of pipe
Superficial Velocities
Gas (Vsg)
53.052 m/s
Liquid (Vsl)
0.255 m/s
Mixture (Vm)
53.306 m/s
Pressure Drop Components
Frictional:106.95 kPa
Gravitational:0.00 kPa
Total:106.95 kPa
Dimensionless Parameters
Reliquid:25465
Regas:353678
Frliquid:0.257
Frgas:53.563
Weber:90.1
XLM:0.193
Flow Regime Map (Taitel-Dukler Type)
Stratified
Low velocities - gravity separates phases
Slug/Plug
Moderate velocities - intermittent liquid slugs
Annular
High gas velocity - liquid film on wall
Bubbly
High liquid velocity - bubbles dispersed
Mist
Very high gas velocity - droplets entrained
Current flow: Vsg = 53.05 m/s, Vsl = 0.25 m/s
Learn More About Two-Phase Flow
Understand flow regimes, void fraction correlations, pressure drop models, and applications in oil & gas, refrigeration, and process industries.
View Theory & Examples