If a fluid having viscosity 0.6Ns/m2 and density of 900kg/m3, flows through a pipe of diameter 40mm, then find the maximum velocity of fluid (in m/s) inside the pipe for laminar flow. (Critical Reynold's number =2100)
A
35
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B
90
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C
46.6
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D
31.5
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Solution
The correct option is A35 Reynolds number = Dvρμ For the flow to be laminar, 0.04×v×9000.6<2100 ⇒0.04×vmax×9000.6=2100 ⇒vmax=35m/s