Question

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

(a) Zero

(b) Greater than one

(c) Less than one

(d) Not defined

The question was asked in an internship interview.

I want to ask this question from Location of a Hydraulic Jump in chapter Non Uniform Flow in Channels of Fluid Mechanics

Answer 1

The correct option is (c) Less than one

Easy explanation: Sub critical 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.