The highest velocity (in cm/sec) for flow of water of viscosity 0.01 poise to be laminar in a 6 mm pipe is

\frac{100}{3}

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\frac{125}{3}

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200

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Solution

The correct option is A $\frac{100}{3}$
For pipe flow critical Reynolds number,

$R e_{c} = 2000$

$R e_{c} = \frac{ρ V D}{μ} = 2000$

$∴ V = \frac{2000 \times 0.01}{1 \times 0.6} = \frac{100}{3} cm/sec$

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The highest velocity (in cm/sec) for flow of water of viscosity 0.01 poise to be laminar in a 6 mm pipe is

The correct option is A 1003For pipe flow critical Reynolds number, Rec=2000 Rec=ρVDμ=2000 ∴V=2000×0.011×0.6=1003 cm/sec

The correct option is A $\frac{100}{3}$
For pipe flow critical Reynolds number,

$R e_{c} = 2000$

$R e_{c} = \frac{ρ V D}{μ} = 2000$

$∴ V = \frac{2000 \times 0.01}{1 \times 0.6} = \frac{100}{3} cm/sec$