A fluid (μ/ρ) = 0.01 cm2/sec is moving at critical flow condition (NRe = 2100) through a pipe of dia 3 cms. Velocity of flow is _______________ cm/sec?
Correct answer: A. 7
- A. 7
- B. 700
- C. 7000
- D. 630
Explanation
Using Re = VD/ν gives V = Reν/D = (2100)(0.01)/3 = 7 cm/s. The viscosity ratio is kinematic viscosity, so its given units can be used directly with diameter in centimetres.
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