Reynolds Number

Re = v·L/ν — flow regime (laminar / turbulent)

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Velocity (m/s)

Char. length (m)

ν (×10⁻⁶) (m²/s)

Water ν ≈ 1×10⁻⁶ m²/s at 20°C. L — pipe diameter or airfoil chord.

How it works

Calculate Reynolds number to classify laminar vs. turbulent fluid flow.

Who it's for: Mechanical and chemical engineers analyzing pipe and channel flow.

Re = v·L/ν where L is characteristic length (e.g., pipe diameter) and ν is kinematic viscosity.

Re < 2300 → laminar; Re > 4000 → turbulent; between is transitional.

Water ν ≈ 1×10⁻⁶ m²/s at 20°C.

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