SLUICE GATE
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This document summarizes an experiment to investigate water flow under a sluice gate. The objectives are to observe flow patterns, determine the relationship between upstream head and flow rate, determine the discharge coefficient, and analyze results. The experiment uses a flow channel, sluice gate, depth gauges, restriction block, and stopwatch. Water depth and velocity are measured upstream and downstream of the gate at varying upstream depths to calculate flow rate based on equations derived from Bernoulli's principle. Observations are recorded and discharge coefficient is determined.
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SLUICE GATE
- 1. PREPARED BY: KOLEKAR AKSHAY VIVEKANAND FROM : LOKMANYA TILAK COLLEGE OF ENGG, KOPAR KHAIRANE
- 2. Aim: To investigate the flow of water under a sluice gate. Objective: • Observe flow patterns under a sluice gate • Determine the relationship between upstream head and flow rate. • Determine the discharge coefficient. • Analyze and discuss about the results.
- 3. Introduction: The sluice gate provides a convenient means of flow regulation. A gate is provided with a lifting mechanism so that the aperture beneath it may be set to any desired position. When closed, the aperture is sealed so that no flow can pass through the gate.
- 4. THEORY:
- 5. From Bernoulli Equation, (P1 /ɣ) + (V1 2 /2g) + Z1 = (P2 /ɣ) + (V2 2 /2g) + Z2 ....(1) AS P1 = P2 =0 and By conservacion of mass: Q = V1 Z1 b = V2 Z2 b …..(2) V1 =(Z2/Z1)V2 ……(3) (V1 2 /2g) + Z1 = (V2 2 /2g) + Z2 (Z2 2 *V2 2 )/(Z1 2 *2g) + (Z1 - Z2 ) = (V2 2 /2g) …….(FROM(3)) (Z2 2 *V2 2 )/(Z1 2 ) + 2g(Z1 - Z2 ) = V2 2 V2 2 - V2 2 (Z2 2 / Z1` 2 ) = 2g(Z1 - Z2 ) V2 2 (1- (Z2 2 / Z1` 2 )) = 2g(Z1 - Z2 ) V2 2 = 2g(Z1 - Z2 )/ (1- (Z2 2 / Z1` 2 )) V2=( 2g(Z1 - Z2 )/ (1- (Z2 2 / Z1` 2 ) ) (1/2) SUBSTITUTE VALUE OF V2 IN EQUATION (2) Q = Z2 b( 2g(Z1 - Z2 )/ (1- (Z2 2 / Z1` 2 ) ) (1/2)
- 6. Apparatus: Flow channel. Sluice gate. Two depth gauges. Restriction block for controlling the downstream flow. Stopwatch.
- 7. Procedure: 1) Adjust the vertical position of the sluice gate so that the bottom of the gate is the desired distance b, above the channel bottom. 2) Measure the width, b, of the channel (which is equal to the width of the gate). 3) Turn on the pump and adjust the control valve to produce the desired water depth upstream of the sluice gate. 4) Insert a float into the water upstream of the gate and measure the water velocity, V 1 by recording the time t; it takes the float to travel a distance L. That is, use a point gauge to measure the water depth, upstream of the gate. 5) Adjust the control valve to produce various water depths upstream of the gate and repeat the measurements.
- 8. DIAGRAM
- 9. Observation and calculation: Sluice gate width B (mm) z 1 ( mm ) Z 2 ( mm ) 152.4 37.44 13 1.46
- 10. CONCLUSION : Hence we have studied and investigate the flow of water under sluice gate.