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4. DISCUSSION
In this experiment the pressure drop was measured at different parts of the
rough pipe by utilising the devices called flowmeters such as orifice meter, nozzle
meter, pitot tube and rotameter. The calculated pressure drop then was related to the
flow rate of the tap water. As it was stated before, the calibration of the devices was
also conducted which in a way showed the efficiency of the one and the other
flowmeters.
After plotting the loglog curves of the mass flow rate versus the height of the
manometer for orifice meter, nozzle meter and pitot tube, the graphs appeared to be
linear. It means that the relation between the flow rate and the manometer reading is
in the form of
.
*
C
m A h
=
where A is the slope of the calibration curve and C is the
10
th
base exponential of the xintercept of the curve. As it can be seen the slopes of the
curves are nearly equal to 0.5 which is the theoretically expected result. The
calibration curve for the rotameter was not a loglog as can be seen from Figure 3.1.
The curve is linear and it states that the readings of the rotameter are directly
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 Spring '11
 ahmetarslan

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