Exit console
Multiphase pipelines — flow regime

Mandhane horizontal-pipe flow regime map

Plot superficial gas + liquid velocities to identify the dominant flow regime. Drives separator inlet design, slug-catcher sizing, AIV/FIV vibration risk, and inhibitor injection strategy.

Inputs

m/s
Q_gas / A_pipe at flowing conditions
m/s
Q_liquid / A_pipe at flowing conditions
risers, hilly terrain — slug catcher needed

Results

Flow regime map (Mandhane horizontal pipe)
StratifiedWavySlugAnnularDispersed bubbleBubble(5.00, 1.000)10⁻²10⁻¹10⁰10¹10²10⁻³10⁻²10⁻¹10⁰10¹superficial gas velocity V_sg (m/s, log)superficial liquid V_sl (m/s, log)Mandhane et al. 1974 · horizontal pipe · air-water at 25 °C / 1 atm · ranges shift with ρ_g, μ_l, σ
V_sg = 5.00 m/s · V_sl = 1.000 m/s · operating in: Slug
V_sg5.00m/s
V_sl1.000m/s
Vsg / Vsl ratio5.0
Mixture velocity Vm6.00m/s
Erosional velocity (API RP 14E)~25 m/s for CS, 200 / √ρ_mm/s
The Mandhane map is for horizontal air-water pipes — boundaries shift with fluid properties. For inclined / vertical pipe use Beggs-Brill or OLGA. For severe-slug risk in risers use Taitel-Dukler.
Download all inputs + calculations + outputs as a single PDF.