Civil Engineering MCQAE Level Civil Engineering
The Reynolds number for pipe flow is defined as Re = rho x V x D / mu. For the same mean velocity and pipe diameter, if fluid viscosity doubles (all else same), Re will:
Fluid MechanicsReynolds NumberMEDIUM
Choose the correct answer
A
Double
B
Remain same
C
Halve
D
Quadruple
Correct Answer
C. Halve
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Re = rho x V x D / mu. If mu doubles, Re = rho x V x D / (2mu) = Re_original / 2. Higher viscosity means more laminar tendency, lower Re.
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