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Name of the Experiment
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Determination
of coefficient of discharge of liquid using Rotometer
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Theory
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A flow meter
is used to measure the flow rate of fluid in a pipe. A Rotometer consists of
a transparent pipe of variable cross sectional area in which a float is
provided. When a fluid flows up in the pipe, it lifts the float and the
measure of the lift is proportional to the flow rate. The Rotometer is
calibrated by the manufacturer. These meters are widely used in industrial
piping applications. The range of the Rotometer is normally limited.
The experimental setup consists of a pipe
line connected to the Rotometer. The pipe line is provided with a flow
control valve at the outlet.
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List of Equipment needed
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1. Collecting tank.
2. Stop clock
3. Orifice.
4. Inside caliper
5. Measuring tape.
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Procedure
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1.
The internal cross
sectional area of the collecting tank is measured.
2.
Open the flow control
valve and allow a certain flow rate in the pipe.
3.
Observe the Rotometer
float position.( i.e.), this directly indicates the flow rate in LPM.
4.
Collect the water in
the collecting tank. Close the drain valve and find the time taken for 10 cm.
rise in the tank.
5.
Repeat the same
procedure for various Rotometer readings.
6.
The
aggregates should then be placed in an oven at a temperature of 100 to 110oC
for 24hrs. It should then be removed from the oven, cooled and weighed
(Weight ‘B’)
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Observation and Tabulation
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Length
of the collecting tank ,L =
Breadth of the collecting tank ,B =
Area
of the collecting tank, A =
Rise
of water in the collecting tank =
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Calculation
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i) Actual discharge Q act =Ah/t m3/sec.
ii) Coefficient discharge, Cd= Qact/Qth.
H= x(Sm/Sw-1)
Where, A= Area of
collecting tank in m2.
h = 10 cm rise of
water in the collecting tank in mm.
t
= Time taken foe 10m rise of water in sec.
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Result and Discussion
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GRAPH:
A
graph was plotted by log-H along x-axis and log-Qact along y-axis.
RESULT:
The coefficient of discharge of the orifice is
1.From
tabulation=
2.From
graph=
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