Chemical Engineering > GATE 2019 > Pipe Flow
An incompressible Newtonian fluid flows in a pipe of diameter D1 at volumetric flow rate Q. Fluid with same properties flows in another pipe of diameter D2 = D1/2 at the same flow rate Q. The transition length required for achieving fully-developed flow is l1 for the tube of diameter D1, while it is l2 for the tube of diameter D2. Assuming steady laminar flow in both cases, the ratio l1/l2 is
A
$1/4$
B
1
C
2
D
4

Correct : b

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