Two-Phase Flow Analysis

Featured: Flow regime determination, pressure drop calculations, void fraction analysis

Flow Parameters

Enter the basic parameters for your two-phase flow system

Liquid Flow Rate (kg/s)

Gas Flow Rate (kg/s)

Pipe Diameter (mm)

Pipe Orientation

Liquid Density (kg/m³)

Gas Density (kg/m³)

[Flow visualization will appear here]

Preliminary Results

Liquid Superficial Velocity: - m/s

Gas Superficial Velocity: - m/s

Flow Quality: -

Flow Regime Analysis

Determine the flow regime and transition boundaries

[Flow regime visualization will appear here]

Regime Analysis Results

Predicted Regime: -

Lockhart-Martinelli Parameter: -

Void Fraction: -

Slip Ratio: -

Pressure Drop Calculation

Calculate two-phase pressure drop using various methods

[Pressure profile visualization will appear here]

Pressure Drop Results

Total Pressure Drop: - kPa

Frictional Component: - kPa

Elevation Component: - kPa

Acceleration Component: - kPa

Two-Phase Flow Theory

Flow Regimes

Two-phase flow regimes describe the spatial distribution of gas and liquid phases in a pipe. Common regimes include:

Bubbly flow: Small gas bubbles dispersed in continuous liquid phase
Slug flow: Large bullet-shaped gas bubbles separated by liquid slugs
Churn flow: Chaotic mixture with oscillating liquid and gas phases
Annular flow: Liquid film on pipe wall with gas core in center
Stratified flow: Separated layers of liquid and gas (horizontal pipes)

Pressure Drop Methods

The Lockhart-Martinelli method correlates two-phase pressure drop by defining a parameter X_tt:

X_tt = √[(ΔP_L/ΔP_G)]

The Homogeneous model treats the two-phase mixture as a single fluid with averaged properties:

ΔP_TP = ΔP_L × φ_L²

Where φ_L is the two-phase multiplier based on X_tt.

Additional Resources

Flow Pattern Maps

Baker, Taitel-Dukler, Hewitt-Roberts

Void Fraction Correlations

Drift flux, Zivi, Chisholm

Pressure Drop Correlations

Lockhart-Martinelli, Friedel, Müller-Steinhagen

Flow Assurance

Slugging, hydrate formation, wax deposition

Case Studies

Oil-gas pipelines, refrigeration systems

API Standards

RP 14E, RP 1111, RP 86

Two-Phase Flow Calculator