Question

Fluid flow after the hydraulic jump is ______

(a) Normal

(b) Rough

(c) Smooth

(d) Zero

The question was posed to me by my school principal while I was bunking the class.

This intriguing question comes from Hydraulic Jump in chapter Non Uniform Flow in Channels of Fluid Mechanics

Answer 1

Right choice is (b) Rough

Explanation: Hydraulic jump is not possible when the initial speed is less than the critical speed. There is a transition that is created during the change. Fluid flow after the hydraulic jump is typically rough and choppy turbulent flow.