Pipe Flow Engineering Hub
Pipe Flow Calculator Hub
Complete pipe flow engineering calculations — flow rate, velocity, pressure drop, Reynolds number, friction loss and pump sizing. Based on Darcy-Weisbach and continuity equations.
Core Pipe Flow Formulas
Q = A x v
Continuity equation: Flow rate = Area x Velocity
Re = rho x v x D / mu
Reynolds number: Laminar (Re<2300) vs Turbulent (Re>4000)
hf = f x (L/D) x v^2/(2g)
Darcy-Weisbach: Major friction head loss
dp = f x (L/D) x (rho x v^2)/2
Pressure drop from friction
v = Q / A = 4Q / (pi x D^2)
Velocity from flow rate and diameter
Pipe Flow Calculators
Flow Regime Classification
| Reynolds Number | Flow Regime | Characteristics |
|---|---|---|
| Re < 2300 | Laminar | Smooth parallel streamlines, parabolic velocity profile, f = 64/Re |
| 2300 ≤ Re ≤ 4000 | Transitional | Unstable flow, intermittent turbulence, use safety factor |
| Re > 4000 | Turbulent | Chaotic mixing, flat velocity profile, use Colebrook or Swamee-Jain for f |