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What is the Froude’s number for a channel having mean velocity 4.34 m/s and mean hydraulic depth of 3m?

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+1 vote
in Fluid Mechanics by (118k points)
What is the Froude’s number for a channel having mean velocity 4.34 m/s and mean hydraulic depth of 3m?

(a) 0.4m

(b) 0.6m

(c) 0.7m

(d) 0.8m

The question was asked during an internship interview.

My question comes from Types of Flow in Channels topic in chapter Flow in Open Channels of Fluid Mechanics

1 Answer

+2 votes
by (362k points)
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Best answer
Right option is (d) 0.8m

To explain: Froude’s number (Fr) = V/ (gD^2)

= 4.34/ (9.81) (3^2)

= 0.8m.

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