Pipe Flow

Reynolds Number

Classify flow as laminar, transitional, or turbulent in a full pipe.

Formula

Re = V·D / ν

Velocity, Vm/s

Internal diameter, Dmm

Kinematic viscosity, ν (×10⁻⁶ m²/s)×10⁻⁶ m²/s

Water at 20 °C ≈ 1.004

Resultlive

Flow regime: Re < 2000 laminar; 2000–4000 transitional; > 4000 turbulent.