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# PPT NOTCH AND WEIR.pptx

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Lecture 4 flow_measurements
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# PPT NOTCH AND WEIR.pptx

FLUID MECHANICS

FLUID MECHANICS

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### PPT NOTCH AND WEIR.pptx

1. 1. KALI CHARAN NIGAM INSTITUTE OF TECHNOLOGY, BANDA LECTURE ON NOTCHES AND WEIR FLUID MECHANICS AND FLUID MACHINE(KME302) ( III SEMESTER ) BY : DEEPAK KUMAR YADAV ME DEPARTMENT
2. 2. INDRODUCTION NOTCH : A notch is a device used for measuring for rate of a liquid through a small channel or a tank. WEIR: A weir is a concrete or masonary structure, placed in open channel over which the flow occurs. It is generally in the form of vertical wall, with a sharp edge at the top , running all the way across the open channel.
3. 3. DISCHARGE OVER A RECTANGULAR NOTCH OR WEIR The expression for discharge notch or weir is the same. Let H = Head of water over the crest L = Length of the notch or weir. The area of strip = L×dh and theoretical velocity of water flowing through strip=
4. 4. DISCHARGE OVER A RECTANGULAR NOTCH OR WEIR The discharge dQ, through strip is dQ= Cd×Area of strip × Theoretical velocity Total discharge Q,
5. 5. NUMERICAL • PROBLEM 1 : Find the discharge of water flowing over a rectangular notch of 2m length when the constant head over the notch is 300mm. Take Cd=0.6. • PROBLEM 2: Determine the height of a rectangular weir of length 6m to be built across a rectangular channel. The maximum depth of water on the upstream side of the weir is 1.8m and discharge is 2000 lt/s. Take Cd=0.6. [AKTU 2015-16]
6. 6. THANK YOU