๐ Two-Phase Gas-Liquid Pipe Flow
Solve two-phase pressure drops using Friedel & Lockhart-Martinelli correlations, Rouhani-Axelsson void fraction, and identify flow regimes.
โก Fortran 90 Engine
Double Precision (IEEE 754)
โ ISO / ASME Validated
Fluid Mechanics
๐ Solver Telemetry
โ ACTIVE
๐๏ธ Views
28
โก Solves
24
๐พ Downloads
487
๐ฆ Fortran Code
4.5 KB
๐
Released
Jun 2026
โฑ๏ธ Latency
< 1 ms
๐ก
Hardware & Sizing Partner: Need to size a control valve or check ASME flange bolt torque for this line?
๐ Two-Phase Gas-Liquid Flow Regime Simulation
Real-time dynamic visualization of phase distribution & interfaces๐ Configuration & Presets
โจ๏ธ Steam-Water Boiler (Vertical)
๐ข๏ธ Oil-Gas Pipeline (Slug)
โ๏ธ R134a Evaporator Tube
๐จ Air-Water Transport
Key Formulations:
โข Friedel Multiplier: (dP/dz)2ฯ = ฮฆL0ยฒ (dP/dz)L0
โข Lockhart-Martinelli: Xtt = [(1โx)/x]0.9 (ฯG/ฯL)0.5 (ฮผL/ฮผG)0.1
โข Void Fraction: ฮฑ = Drift Flux (Rouhani-Axelsson)
โข Total ฮP = ฮPfric + ฯ2ฯ g L sin(ฮธ)
โข Friedel Multiplier: (dP/dz)2ฯ = ฮฆL0ยฒ (dP/dz)L0
โข Lockhart-Martinelli: Xtt = [(1โx)/x]0.9 (ฯG/ฯL)0.5 (ฮผL/ฮผG)0.1
โข Void Fraction: ฮฑ = Drift Flux (Rouhani-Axelsson)
โข Total ฮP = ฮPfric + ฯ2ฯ g L sin(ฮธ)
๐ Simulation Results
Configure inputs and click Compute to view results.
๐ Calculation Methodology & Engineering Theory
Friedel Two-Phase Multiplier
The Friedel (1979) correlation is widely accepted across ASME and HEI standards for turbulent liquid-gas flows in vertical and horizontal lines:
ฮฆL0ยฒ = E + 3.24 ยท F ยท H / (FrH0.045 ยท WeL0.035)
Drift-Flux Void Fraction ($\alpha$)
Accounting for the slip velocity between light vapor and dense liquid using Rouhani & Axelsson's drift-flux model:
ฮฑ = (x / ฯG) / [Cโ (x/ฯG + (1โx)/ฯL) + ugj / G]
Key Engineering Assumptions
- Adiabatic or slowly evaporating pipe flow (steady equilibrium quality).
- Newtonian liquid and gas phase behavior.
- Pipe wall friction evaluated via Churchill friction factor for both phases.
- Acceleration pressure gradient neglected for uniform diameter lines.