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Question

Water flows at a speed of 6 cm s-1 through a tube of radius 1 cm. Coefficient of viscosity of water at room temperature is 0.01 poise. Calculate the Reynolds number. Is it a steady flow?



A

60, yes

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B

60, no

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C

120, yes

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D

120, no

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Solution

The correct option is D

120, yes


You know,
Reynolds number, N=ρvDη
Where, ρ = density of fluid

v = velocity of flow of the fluid

D = diameter of the tube
η = coefficient of viscosity of the fluid
N=1000×6100×21000.01
{all values in SI}
N = 120 {Dimensionless}, yes the flow is steady


Physics

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