Calculators›Dukler Correlation
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Dukler Correlation Calculator: Two-Phase Flow

Taitel-Dukler Flow Pattern & Pressure Drop for Horizontal Pipelines

Taitel-Dukler Two-Phase Flow Calculator
Predicts flow patterns (stratified, wavy, slug, annular, bubble) and pressure drop in horizontal/near-horizontal two-phase pipelines. Uses Lockhart-Martinelli correlation for pressure drop with API RP 14E erosional velocity checking.

Flow Rates

Pipe Geometry

in
ft
degrees
ft

Liquid Properties

lb/ft³
cp
dyne/cm

Gas Properties

air=1
cp

Operating Conditions

psia
°F

📚 Learn the Theory

Understand two-phase flow regimes, liquid holdup, and multiphase pressure drop

Read Engineering Guide →

📘 Methodology & References

Calculation Sequence

1. Flow Pattern: Taitel-Dukler (1976) map using Froude numbers and Kelvin-Helmholtz stability
2. Liquid Holdup: Regime-specific correlations (mechanistic for stratified, empirical for slug/annular)
3. Two-Phase Multiplier: Lockhart-Martinelli Φ² = 1 + C/X + 1/X² with regime-dependent C values
4. Pressure Drop: dP/dz = (friction × Φ²) + gravity + acceleration, segmented for compressibility
5. Erosional Check: API RP 14E Ve = C/√ρm where C = 100 for continuous service

Reference Standards

Flow Pattern: Taitel & Dukler, "A Model for Predicting Flow Regime Transitions," AIChE Journal 22(1), 1976
Pressure Drop: Lockhart & Martinelli, Chem. Eng. Progress, 1949
Holdup: Dukler et al., AIChE Journal 10(1), 1964
Erosion: API RP 14E, 5th Edition - Design and Installation of Offshore Production Platform Piping Systems

🌊 Flow Pattern Guide

Stratified (Smooth/Wavy)
Low gas & liquid velocities. Liquid at bottom, gas flows above. Lowest pressure drop. Good for pigging.
Slug/Plug (Intermittent)
Moderate velocities. Liquid slugs alternate with gas pockets. Most problematic - causes separator surging, vibration. Requires slug catcher.
Annular
High gas velocity. Liquid film on pipe wall, gas core with droplets. Higher pressure drop. Common in high-rate gas wells.
Bubble/Dispersed
Very high liquid rate, low gas. Gas bubbles in liquid. Rare in gas pipelines. Behaves like single-phase liquid.

⚡ Applicability & Limitations

• Best For: Horizontal and near-horizontal pipes (|angle| ≤ 15°)
• Diameter Range: 2-36 inches (validated)
• Pressure Range: 50-3000 psia
• Accuracy: ±20% for pressure drop, ±15% for holdup (typical)
• Limitation: Not suitable for highly inclined or vertical pipes - use Beggs-Brill instead
• Assumption: Steady-state flow; does not model transient slugging

Frequently Asked Questions

What is the Dukler correlation used for in pipeline design?

The Dukler correlation predicts pressure drop and liquid holdup in horizontal and near-horizontal two-phase flow. It uses the Lockhart-Martinelli parameter to correlate the two-phase friction factor and holdup.

What is the Taitel-Dukler flow pattern map?

The Taitel-Dukler model is a mechanistic flow pattern prediction method that classifies horizontal two-phase flow into stratified, intermittent, annular, dispersed bubble, and stratified wavy regimes based on dimensionless parameters.

What is the Lockhart-Martinelli parameter?

The Lockhart-Martinelli parameter (X) is the ratio of single-phase liquid pressure drop to single-phase gas pressure drop. It is used in the Dukler correlation to determine two-phase friction multipliers and liquid holdup.

When should you use Dukler vs. Beggs-Brill?

Dukler correlation is preferred for horizontal and near-horizontal pipelines where stratified and slug flow dominate. Beggs-Brill is better suited for inclined and vertical pipes where inclination effects are significant.

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