AutoEngCalc - Engineering Calculators

Two-Phase Flow Calculator

Analyze simultaneous flow of gas and liquid in pipelines with industrial accuracy. Calculate flow regimes, pressure drops, and void fractions.

Two-Phase Flow: Liquid=5 kg/s, Gas=0.5 kg/s
ΔP = 12.5 kPa

Two-Phase Flow Calculator

Analyze simultaneous flow of gas and liquid in pipelines

Flow Parameters

Enter the basic parameters for your two-phase flow system

kg/s
kg/s
mm
kg/m³
kg/m³

Flow Regime Analysis

Determine the flow regime and transition boundaries

cP
cP
N/m

Pressure Drop Calculation

Calculate two-phase pressure drop using various methods

mm
m
m

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 Xtt:

Xtt = √[(ΔPL/ΔPG)]

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

ΔPTP = ΔPL × φL2

Where φL is the two-phase multiplier based on Xtt.

Two-Phase Flow Analysis

Flow Visualization

[Flow visualization will appear here]

Preliminary Results

Liquid Velocity
-
m/s
Gas Velocity
-
m/s
Flow Quality
-
-
Flow Regime
-
-

Advanced Results

Void Fraction
-
-
Slip Ratio
-
-
Pressure Drop
-
kPa
LM Parameter
-
-

Calculation Method

Enter parameters and click "Calculate Flow Properties" to see results

Two-Phase Flow Applications

Industrial Applications

Two-phase flow is encountered in numerous industrial processes including oil and gas production, power generation, refrigeration systems, and chemical processing. Understanding flow behavior is critical for equipment design and operational safety.

  • Oil & Gas: Wellbore flow, pipeline transport
  • Power Generation: Boilers, condensers, steam systems
  • Refrigeration: Evaporators, condensers
  • Chemical Processing: Reactors, distillation columns

Key Parameters

Two-phase flow analysis involves calculating several important parameters:

  • Void Fraction: Ratio of gas cross-sectional area to total area
  • Slip Ratio: Ratio of gas velocity to liquid velocity
  • Pressure Gradient: Sum of frictional, gravitational, and acceleration components
  • Flow Regime: Spatial distribution of phases (bubbly, slug, annular, etc.)

Additional Flow Analysis Resources

Flow Pattern Maps

Baker, Taitel-Dukler, Hewitt-Roberts

Void Fraction

Drift flux, Zivi, Chisholm correlations

Pressure Drop

Lockhart-Martinelli, Friedel correlations

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