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During a subcritical flow, what is the value of Froude’s number?

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+1 vote
in Fluid Mechanics by (118k points)
During a subcritical flow, what is the value of Froude’s number?

(a) Zero

(b) Greater than one

(c) Less than one

(d) Not defined

I got this question during an online interview.

This interesting question is from Hydraulic Jump topic in chapter Non Uniform Flow in Channels of Fluid Mechanics

1 Answer

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Best answer
Right choice is (c) Less than one

The best I can explain: Subcritical depth occurs when actual water depth is greater than the critical depth. It is dominated by gravitational forces and behaves in a slow and stable way. The Froude’s number is less than one during a subcritical flow.

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