Flow Measurement Civil Engineering (CE) Notes | EduRev

Civil Engineering SSC JE (Technical)

Civil Engineering (CE) : Flow Measurement Civil Engineering (CE) Notes | EduRev

The document Flow Measurement Civil Engineering (CE) Notes | EduRev is a part of the Civil Engineering (CE) Course Civil Engineering SSC JE (Technical).
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Chapter 6 Flow Measurement

DeviceMeasurement
Venturimeterrate of flow (discharge)
Flow nozzlerate of flow
Orifice meterrate of flow
Bend meter rate of flow
Rotameterrate of flow
Pitot tubevelocity
Hot wire anemometerair & gas velocity
Current metervelocity in open channels


Venturimeter:
-Cone angle of convergence side (20°) is greater than cone angle of divergence side (5° to 7°).
-Position of venturimeter does not play any role in discharge thus it is constant for horizontal, inclined or vertical position.
Flow Measurement Civil Engineering (CE) Notes | EduRev
-Qac = Cd Qth
-Cd = coefficient of discharge = 0.95 to 0.98
-h = venturi head which is difference between pressure heads
-Throat diameter is known as size of the venturimenter.

Flow Measurement Civil Engineering (CE) Notes | EduRev

Orifice meter:
-It is a cheaper arrangement but has more energy loss.
-Cd for orifice meter = 0.68 - 0.74

Flow Measurement Civil Engineering (CE) Notes | EduRev

Flow Measurement Civil Engineering (CE) Notes | EduRev
-a1 = πd2/4
-a2 = πdc2/4

Pitot Tube:
-It is based on principle of conversion of kinetic head into pressure head. The point at which velocity reduces zero is called stagnation point.

Flow Measurement Civil Engineering (CE) Notes | EduRev
-Vac = Cv .Vth
-Cv = Coefficient of velocity = 0.99
-ps/γ = stagnation head & Flow Measurement Civil Engineering (CE) Notes | EduRev static head.
-Velocity head is indicated by the difference in liquid level between the Pitot tube and the piezometer.The Pitot tube measures the total head and therefore known as total head tube.

Hydraulic Coefficients:
- Contraction coefficient (Cc) =
Flow Measurement Civil Engineering (CE) Notes | EduRev

- Coefficient of velocity of (Cv) =
Flow Measurement Civil Engineering (CE) Notes | EduRev

- Coefficient of discharge (Cd) =
Flow Measurement Civil Engineering (CE) Notes | EduRev

- Cd = Cv . Cc

Flow through orifice in the tank:
Flow Measurement Civil Engineering (CE) Notes | EduRev
Discharge through orifice when head over orifice is h
Flow Measurement Civil Engineering (CE) Notes | EduRev
Time required to lower the level from H to h

 Flow Measurement Civil Engineering (CE) Notes | EduRev
Rectangular Weir/Notch:

 Flow Measurement Civil Engineering (CE) Notes | EduRev
Flow Measurement Civil Engineering (CE) Notes | EduRev
Flow Measurement Civil Engineering (CE) Notes | EduRev

L = length of crest
H = head above crest 

Triangular weir:

 Flow Measurement Civil Engineering (CE) Notes | EduRev
Flow Measurement Civil Engineering (CE) Notes | EduRev

Flow over cippoletti weir or trapezoidal weir:
-Trapezoidal weir is also called as Cippoletti weir. This is trapezoidal in shape and is the modification of rectangular weir with slightly higher capacity for same crest strength.
 -
The sides are inclined outwards with a slope 1:4 (horizontal : vertical)

 Flow Measurement Civil Engineering (CE) Notes | EduRev
Flow Measurement Civil Engineering (CE) Notes | EduRev

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