Fluid Mechanics

Reynolds Number Calculator

Calculate Reynolds number (Re) for pipe flow to determine laminar, transitional, or turbulent regime. Includes friction factor and flow regime classification.

Parameters

Fluid

Flow Velocity (m/s)

Pipe Diameter D (mm)e.g. 50 mm = DN50 (0.05 m internal)

Results

Reynolds Number

9.980e+4

Turbulent Flow

Friction Factor f

0.01778

Density

998 kg/m³

Viscosity

0.001 Pa·s

Re = ρVD/μ. Laminar: Re < 2300 (smooth, parallel streamlines). Transitional: 2300 ≤ Re < 4000. Turbulent: Re ≥ 4000 (chaotic mixing). Friction factor: f = 64/Re (laminar), f = 0.316/Re^0.25 (turbulent, Blasius).

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