Hydraulic Lab

Decent Essays
CE2041-Hydraulic Engineering
Experiment No. 6 Flow under a Vertical sluice gate

Module leader: Dr Keith Shepherd

Student Name:

Submission Date: Mon 08/10/2012

Flow under a vertical sluice gate: Part A: Free discharge:
Part A: Free discharge y1=0.3680±0.0005m y2=0.0280±0.001m y3=0.0310±0.003m y4=0.1640±0.010m

Time for 1 cube of water to pass the channel =47.2s

Part A: Q1: viii)
Theoretical y2 = 0.0262m
Measured y2 = 0.0280±0.001m
Energy discrepancy = 0.0443J
Based on the hydraulic theory velocity=discharge / height, with the same discharge, lower height of stream flows with higher velocity than stream with greater height. The energy equation K.E.=mv22 and E=y+v22g also show Measured y2 contains lower
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Immediately after the process of hydraulic jumping, the hydraulic flow performs turbulent flow, which indicates the particles are likely to be moving in irregular directions, which increases the pressure to the boundary, and therefore the energy dissipated is greater.

Part A: Q3: vii)
Discuss briefly the use of a hydraulic jump for energy dissipation. * Its aim is to perform as an energy-dissipating device to reduce energy level of water flows. * It reduces uplift pressure under the foundations of hydraulic structures. * It raises the water level on the downstream side of a measuring flume and maintains high water level in the side of a measuring flume and also maintains high water level in the channel for irrigation or other water-distribution purpose. * It reduces pumping heads. * It used to for mixing of certain chemicals like in case of water treatment plants.

Part A: Q1: vii)
Theoretical y2 = 0.0897m
Measured y2 = 0.0960±0.008m
There are difficulties in recording y2 as y2 is located within hydraulic jump. Water flow transforms to turbulent flow at the point which hydraulic jump occurs, therefore the possible error in depth is expected to be great.

Flow under a vertical sluice gate: Part B: Drowned Discharge:

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