For water flow in a pipe, V=1 m/s, D=0.05 m and kinematic viscosity=1×10^-6 m²/s. Reynolds number is

Reynolds number Re = VD/ν, where V is velocity, D is pipe diameter and ν is kinematic viscosity of the fluid. Re = 1 × 0.05 / (1×10⁻⁶) = 50000. Since Re = 50000, the flow is turbulent (Re > 4000) — higher friction losses apply. Re < 2000 → laminar; 2000–4000 → transitional; Re > 4000 → turbulent.

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