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Find the reyn...

Question

Find the reynolds number if a fluid of viscosity 0.4 Ns/m2 and relative density of 900 Kg/m3 through a 20 mm pipe with a Velocity of 2.5 m/s?

112.5

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116.5

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113.5

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212.5

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Solution

The correct option is B 112.5
Given : $μ = 0.4 N s / m^{2}$ , $ρ = 900 k g / m^{3}$ , $l = 20 m m = 0.02 m$ , $v = 2.5 m / s$
Reynolds number $N = \frac{ρ v l}{μ} = \frac{900 \times 2.5 \times 0.02}{0.4} = 112.5$

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