Calculate Reynold's number if a fluid having a viscosity of 0.25N.s/m2 and density of 800kg/m3 flows through a pipe of radius 10mm with a velocity of 2m/s.
A
120
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B
128
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C
132
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D
114
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Solution
The correct option is B128
Reynolds number, NRe=ρVDμ where, viscosity of liquid is μ=0.25N.s/m2 Diameter of pipe,D=20×10−3m NRe=800×2×20×10−30.25 ∴NRe=320.25=128