Calculate Reynold’s number, if a fluid having a viscosity of 0.4Ns/m2 and density of 900kg/m3 flows through a pipe of length 20mm with a velocity of 2.5m/s.
A
112.5
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B
130
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C
121.5
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D
100
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Solution
The correct option is A112.5 As we know, Re=Inertia forceViscous force Re=ρvLη=900×2.5×.020.4 Re=112.5