Civil Engineering MCQJE Level Civil Engineering
In a hydraulic jump, if y1 is the supercritical depth (Fr1 > 1), the sequent depth y2 is given by:
Fluid MechanicsFluid MechanicsHARD
Choose the correct answer
A
y2 = 2y1
B
y2 = (y1/2)(√(1 + 8Fr1²) − 1)
C
y2 = y1·Fr1
D
y2 = y1/(Fr1² − 1)
Correct Answer
B. y2 = (y1/2)(√(1 + 8Fr1²) − 1)
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Sequent depths: y2 = (y1/2)(√(1 + 8Fr1²) − 1) from momentum equation. Energy loss in jump = (y2 − y1)³/(4y1y2). Jump converts supercritical to subcritical flow, dissipating energy (used as energy dissipator in spillways). Fr1 > 1 always for hydraulic jump to occur.
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