Venturi meter

1. GROUP 2
VENTURI METER(FLOW)
CHRIS-KOKA CLARIBEL
BOAKYE SAMUEL BONSU

2. DEFINITION
 A venturi meter is a device used for the
measuring the rate of flow of liquid
through pipes. It converts pressure
energy into kinetic energy.
 A venturi meter can be use to increase
the velocity of any type of fluid in a pipe
at any particular point.

3. PARTS OF VENTURI METER
 It consists of 3 parts:
 Converging cone or Diameter (the area
is Decreasing),
 Throat Diameter (the area is constant)
 Diverging cone (the area is increasing)

4. WORKING PRINCIPLE/ DIAGRAM
Venturi meter works on the Bernoulli’s principle
 Bernoulli’s equation, which states that, in a
steady ideal flow of an incompressible fluid,
the total energy at the point of the fluid is
constant.

5. EQUATION FOR FLOW
DISCHARGE
 Theoretical discharge could be measured
because we assume no loss of energy.
 This is given by:

6.  Also, the actual discharge could be
measured. Here the coefficient of
discharge is considered in the equation;

7. DIAGRAM

8. APPLICATION / USES
 Calculating the flow rate of fluid that is
discharged in the pipe.
 Plumbing.
 Carburetor.
 The flow of chemical in pipelines.
 This is widely used in large-diameter pipes
such as found in the waste treatment process.
 Also used in the medicine department for the
measure, the flow rate of blood in arteries.
 This also used where high-pressure recovery
is required.

9. ADVANTAGES
 Power loss is very less.
 This can be used where a small head is available.
 High reproducibility (the extent to which
consistent results are obtained when an
experiment is repeated).
 Accuracy is high over wide flow ranges.
 This can also be used for a compressible and
incompressible fluid.
 This device is easy to operate.
 The coefficient of discharge (Cd ) for the venturi
meter is high.
 This is widely used for high flow rate (Discharge).

10. DISADVANTAGES
 The installation cost of a venturi meter is high.
 There are little difficulties while maintenance.
 This device cannot be used where the pipe has a
small diameter of 76.2 mm.
 Non-linear.
 This system occupies more space as compared to
the orifice meter.
 It has a limitation of lower Reynolds number of
150,000.
 It is expensive and a little bulky.