HYDRAULIC JUMP
I. Objective
The objective is to study the hydraulic jump phenomenon in open channel flow
II. Introduction
A schematic of a hydraulic jump in an open channel of small slope is shown below. In engineering
applications, the hydraulic jump frequently appears downstream from spillways or sluice gates
where flow velocities are high. It may be used as an effective dissipater of kinetic energy, and
thus prevent scour of an alluvial river bottom, or can be induced as a mixing device in water or
sewage treatment designs. In design applications, the engineer is concerned primarily with
predicting the occurrence, size, and location of the jump.
A hydraulic jump is formed when liquid at high velocity discharges into a zone of lower velocity,
creating a rather abrupt rise in depth. The rapidly varying water surface is typically accompanied
by violent turbulence, eddying, air entrainment, and surface undulations.
Figure 1Hydraulic Jump
III. Specifications
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Adjustable Gate and Sliding depth gauge
Open flow channel
Sump tank
Pump : Monoblock type
Piping with necessary Valves and Fittings
III. Procedure
1.
2.
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4.
Confirm that the flume is neat and clean.
Fill the sump tank with water upto 2”bellow the top of the tank.
Connect setup with electricity.
Fully open the bypass valve.
5.
6.
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8.
Switch ON the pump.
Now start the flow in the flume by partially closing the bypass valve
Wait till flow reaches a steady state.
Position the upstream gate or headgate, so that the upstream water level is near the top of the
flume.
9. Position the tailgate such that to create a hydraulic jump in the flume.
10. Repeat steps 8-9 for different headgate position