The Reynolds number is given by the following expression:
Re=μρuDwhere ρ=900kg/m3 is the relative density of the fluid, u=2.5m/s is the velocity of the fluid, D=0.02m is the diameter of the pipe and μ=0.4N⋅s/m2.
Substituting values, obtain:
Re=0.4900⋅2.5⋅0.02=112.5 As far as 112.5<2000, the flow is laminar.
Answer. Re = 112.5, laminar flow.
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