Pitot Tube(velocity profile)
description
Transcript of Pitot Tube(velocity profile)
![Page 1: Pitot Tube(velocity profile)](https://reader034.fdocuments.in/reader034/viewer/2022042513/553dfe974a7959502f8b4862/html5/thumbnails/1.jpg)
PITOT TUBE’S EXPERIMENT
GROUP IV (BATCH –I)
Manne Venkata Harish Babu ME08B013
Manoj Kumar Tripathi ME08B014
Medarametla Krishnakalyan ME08B015
Mohammad Salimuddin ME08B016
![Page 2: Pitot Tube(velocity profile)](https://reader034.fdocuments.in/reader034/viewer/2022042513/553dfe974a7959502f8b4862/html5/thumbnails/2.jpg)
AIM :
To determine the velocity profile of
air flowing through a pipe using
Pitot’s tube
![Page 3: Pitot Tube(velocity profile)](https://reader034.fdocuments.in/reader034/viewer/2022042513/553dfe974a7959502f8b4862/html5/thumbnails/3.jpg)
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
![Page 4: Pitot Tube(velocity profile)](https://reader034.fdocuments.in/reader034/viewer/2022042513/553dfe974a7959502f8b4862/html5/thumbnails/4.jpg)
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
![Page 5: Pitot Tube(velocity profile)](https://reader034.fdocuments.in/reader034/viewer/2022042513/553dfe974a7959502f8b4862/html5/thumbnails/5.jpg)
Construction of Pitot tube:
![Page 6: Pitot Tube(velocity profile)](https://reader034.fdocuments.in/reader034/viewer/2022042513/553dfe974a7959502f8b4862/html5/thumbnails/6.jpg)
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
![Page 7: Pitot Tube(velocity profile)](https://reader034.fdocuments.in/reader034/viewer/2022042513/553dfe974a7959502f8b4862/html5/thumbnails/7.jpg)
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
![Page 8: Pitot Tube(velocity profile)](https://reader034.fdocuments.in/reader034/viewer/2022042513/553dfe974a7959502f8b4862/html5/thumbnails/8.jpg)
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.
![Page 9: Pitot Tube(velocity profile)](https://reader034.fdocuments.in/reader034/viewer/2022042513/553dfe974a7959502f8b4862/html5/thumbnails/9.jpg)
Continued…
Pitot tube was attached to a U-tube
filled with water(manometer)
![Page 10: Pitot Tube(velocity profile)](https://reader034.fdocuments.in/reader034/viewer/2022042513/553dfe974a7959502f8b4862/html5/thumbnails/10.jpg)
The experiment was done at a pressure
of 10 kgf/cm2
![Page 11: Pitot Tube(velocity profile)](https://reader034.fdocuments.in/reader034/viewer/2022042513/553dfe974a7959502f8b4862/html5/thumbnails/11.jpg)
Complete set-up:
![Page 12: Pitot Tube(velocity profile)](https://reader034.fdocuments.in/reader034/viewer/2022042513/553dfe974a7959502f8b4862/html5/thumbnails/12.jpg)
Reading Evidence (Video):
![Page 13: Pitot Tube(velocity profile)](https://reader034.fdocuments.in/reader034/viewer/2022042513/553dfe974a7959502f8b4862/html5/thumbnails/13.jpg)
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
![Page 14: Pitot Tube(velocity profile)](https://reader034.fdocuments.in/reader034/viewer/2022042513/553dfe974a7959502f8b4862/html5/thumbnails/14.jpg)
Velocity Profile:
0
5
10
15
20
25
30
-3 -2 -1 0 1 2 3
Velocity, V(m/s)
Velocity, V(m/s)
![Page 15: Pitot Tube(velocity profile)](https://reader034.fdocuments.in/reader034/viewer/2022042513/553dfe974a7959502f8b4862/html5/thumbnails/15.jpg)
Result :
The velocity profile of air flowing
through the given tube, is almost
parabolic.
![Page 16: Pitot Tube(velocity profile)](https://reader034.fdocuments.in/reader034/viewer/2022042513/553dfe974a7959502f8b4862/html5/thumbnails/16.jpg)
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
![Page 17: Pitot Tube(velocity profile)](https://reader034.fdocuments.in/reader034/viewer/2022042513/553dfe974a7959502f8b4862/html5/thumbnails/17.jpg)
THANK YOU