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IIT Hyderabad, ME 08,experimental report, Determination of velocity profile of air using pitot tube
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PITOT TUBE’S EXPERIMENT
GROUP IV (BATCH –I)
Manne Venkata Harish Babu ME08B013
Manoj Kumar Tripathi ME08B014
Medarametla Krishnakalyan ME08B015
Mohammad Salimuddin ME08B016
AIM :
To determine the velocity profile of
air flowing through a pipe using
Pitot’s tube
BACKGROUND:
The Pitot’s tube is widely employed
to measure fluid velocities in
flowing fluids
One of the major reasons for this
is that it can be used with
“minimal disturbance” to the flow
Continued…
In measurement system terminology,
the sensor is the Pitot tube itself.
The measurand (velocity) is converted
to a differential pressure, which is then
converted by an intermediate modifying
device (manometer) to a differential
height of manometer fluid that is read
from a calibrated scale
Construction of Pitot tube:
THEORY:
Pitot Tube is aligned with the flow direction
Assuming an inviscid, incompressible flow
V – velocity of air
a – density of airPstag – total pressurePstat – static pressure
Continued..
Now, this , the dynamic pressure
is converted into differential height of
the fluid( water, in our case) of
manometer, hence
2a
1ρ v ρ
2wgh
2a
1ρ v
2
Experimental Set-up:
A 2 inch diameter GI pipe was
connected to a 1 inch diameter GI pipe
via an expansion joint, to increase the
resolution and accuracy of the
readings.
Continued…
Pitot tube was attached to a U-tube
filled with water(manometer)
The experiment was done at a pressure
of 10 kgf/cm2
Complete set-up:
Reading Evidence (Video):
Observation :S.No. Distance from the centre
x, (cm)
Height difference
h , (cm)
Velocity , V (m/s)
1. -2.5 0.65 10.3
2. -2.0 1.95 17.84
3. -1.5 2.9 21.76
4. -1.0 3.6 24.24
5. -0.5 4.2 26.19
6. 0 4.5 27.11
7. 0.5 4.15 26.03
8. 1.0 3.55 24.07
9. 1.5 2.9 21.76
10. 2.0 1.9 17.61
11. 2.5 0.7 10.69
Velocity Profile:
0
5
10
15
20
25
30
-3 -2 -1 0 1 2 3
Velocity, V(m/s)
Velocity, V(m/s)
Result :
The velocity profile of air flowing
through the given tube, is almost
parabolic.
Sources of error:
Misalignment of the tube axis and the
velocity vector , exposing the static taps
to some component of the velocity
Influence of the hole-tip spacing
Wall effect
THANK YOU