Civil Engineering MCQJE Level Civil Engineering
Reynolds number (Re) for pipe flow is defined as:
Fluid MechanicsFluid MechanicsMEDIUM
Choose the correct answer
A
Re = μVD/ρ
B
Re = ρVD/μ
C
Re = ρV/μD
D
Re = VD/ρ
Correct Answer
B. Re = ρVD/μ
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Re = ρVD/μ = VD/ν where ρ = density, V = velocity, D = pipe diameter, μ = dynamic viscosity, ν = kinematic viscosity. Re is ratio of inertia to viscous forces. Re < 2000: laminar (viscous dominates, parabolic profile); Re > 4000: turbulent; 2000–4000: transition zone.
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