Question

If the speed at which water flows through a long cylindrical pipe of radius 8 mm is 10 cm/s, find the Reynolds number. 

[Density of water = 1 g/cm³ , coefficient of viscosity of water = 0.01 poise]

Answer 1

Data : v₀ = 10 cm/s, ρ = 1 g/cm³ , r = 8 mm

∴ d = 2r = 16 mm = 1.6 cm, η = 0.01 poise

The Reynolds number, Re = \(\frac{v_0pd} η\)