Chapter 6 Flow Measurement - Fluid Mechanics, Mechanical Engineering Mechanical Engineering Notes | EduRev
Mechanical Engineering SSC JE (Technical)
Mechanical Engineering : Chapter 6 Flow Measurement - Fluid Mechanics, Mechanical Engineering Mechanical Engineering Notes | EduRev
The document Chapter 6 Flow Measurement - Fluid Mechanics, Mechanical Engineering Mechanical Engineering Notes | EduRev is a part of the Mechanical Engineering Course Mechanical Engineering SSC JE (Technical).
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FLOW MEASUREMENT
| Device | Measurement |
| Venturimeter | rate of flow (discharge) |
| Flow nozzle | rate of flow |
| Orifice meter | rate of flow |
| Bend meter | rate of flow |
| Rotameter | rate of flow |
| Pitot tube | velocity |
| Hot wire anemometer | air & gas velocity |
| Current meter | velocity 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.
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.
Orifice meter
- It is a cheaper arrangement but has more energy loss.
Cd for orifice meter = 0.68 - 0.74
Cd for orifice meter = 0.68 - 0.74
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.
- For theoretical velocity, we do not multiply the equation by C.
- 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) =
- Coefficient of velocity of (Cv) =
- Coefficient of discharge (Cd) =
- Cd = Cv.Cc
Flow through orifice in the tank
Time required to lower the level from H to h
Discharge through orifice when head over orifice is h
- Rectangular Weir/Notch
L = length of crest H = head above crest
- Triangular weir
- Trapezoidal weir
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