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Estimate the type of flow in a channel having cross sectional area of 50m^2 and top of the channel is 5m. The mean velocity of flow is 0.1m/s and the absolute viscosity of water is 0.625 N-s/m^2.

(a) Laminar

(b) Turbulent

(c) Transition

(d) Steady

I have been asked this question during an interview for a job.

This intriguing question comes from Types of Flow in Channels in portion Flow in Open Channels of Fluid Mechanics

1 Answer

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Best answer
Right answer is (c) Transition

The best explanation: Reynolds number (Re)=1000VD/µ

Re = 1000(0.1) (D)/ 0.625

D = A/T = 50/5 = 10 m

Re = 1000(0.1) (10)/ 0.625

= 1600

Transition flow (500 – 2000).

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