// multi-utility computation suite · offline · instant · precise
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sci.two-phase-flow-Lockhart-Martinelli Calculator
Calculates two-phase flow pressure drop using the Lockhart-Martinelli parameter X = (ΔP_L/ΔP_G)^0.5 and correlation for void fraction and multiplier φ². Chisholm correlation: φ_L² = 1 + C/X + 1/X² where C = 20 (turbulent-turbulent) — two-phase pressure drop can be 2–10× single-phase liquid drop.
Inputs
Dp L Pa M
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Dp G Pa M
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Quality X
Reference formula or conversion factor shown for context.
Results
Martinelli parameter X_tt
Sample size or count used in the calculation.
two-phase pressure drop (Pa/m)
Pressure lost to friction as fluid moves through the pipe or system. Higher drop = more pumping power required. Reduce by using larger pipes, fewer bends, or lower flow velocity.
void fraction α
Sample size or count used in the calculation.
φ²_G multiplier
Gratuity amount — the suggested amount to add to the bill as a service tip.
Pressure lost to friction as fluid moves through the pipe or system. Higher drop = more pumping power required. Reduce by using larger pipes, fewer bends, or lower flow velocity.
regime
The operating regime — the mode or zone in which the system is currently operating.