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ME 285 - Fluid Mechanics Laboratory: 1.determination of Pipe Friction

This document provides instructions for an experiment to determine the coefficient of friction for pipes of different diameters. The experiment involves measuring the pressure loss over a 3 meter section of pipe as water is pumped through. Pressure loss is measured using a differential manometer. Flow rate is measured using a measuring tank. Darcy-Weisbach equation is used to calculate frictional head loss from which the coefficient of friction can be determined. Results are tabulated and plotted on a graph of head loss versus velocity to find the coefficient of friction for the given pipe.

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24 views2 pages

ME 285 - Fluid Mechanics Laboratory: 1.determination of Pipe Friction

This document provides instructions for an experiment to determine the coefficient of friction for pipes of different diameters. The experiment involves measuring the pressure loss over a 3 meter section of pipe as water is pumped through. Pressure loss is measured using a differential manometer. Flow rate is measured using a measuring tank. Darcy-Weisbach equation is used to calculate frictional head loss from which the coefficient of friction can be determined. Results are tabulated and plotted on a graph of head loss versus velocity to find the coefficient of friction for the given pipe.

Uploaded by

Venkat Krishna
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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ME 285 - Fluid Mechanics Laboratory

1.DETERMINATION OF PIPE FRICTION


Ex.No.:

DATE:

AIM:
To find the co-efficient of friction (f) for the given pipe.
APPARATUS REQUIRED:
1. Piping system: A set of 3 G.I. Pipes of size 15 mm, 20 mm and 25 mm and length 3m, in
between pressure tapings with separate flow control valves.
2. Sump tank of size: 2.0 0.3 0.3 m3.
3. Measuring tank of size: 0.60.30.5 m3 with gage glass and scale arrangement.
4. Differential manometer to measure the loss of pressure head in the pipe lines.
5. Pumpset
FORMULAE USED:
Actual flow rate (Qa):

(m3/sec)
=

where

A = Area of the measuring tank in m2


H = Difference in levels of water in m
t = time required for H m rise in sec
Frictional loss of head in pipes (hf):
The viscous friction loss or major loss is given by Darcy-Weisbach equation.
=
where,

hf = Loss of head (m)


12.6
1000
1000
Sm and Sf are specific gravity of mercury (13.6) and water(1) respectively.
hm = Difference in manometer reading in mm of Hg
f = Coefficient of friction for the pipe
l = Distance between two sections for which head loss is measured (m)
v = Average velocity of flow (Q/a) m/sec
Q = Discharge in m3/sec
=

a = Area of pipe in m2
d = Pipe diameter in m
Once hf and other parameters are known, f can be determined.
SPECIFICATIONS:
Type & Brand
Length between Pressure tapings
Tank area
Pipe diameters

: G.I.Pipe, GEM Brand


: 3 meters
: 0.5 0.3 m2
: 15, 20 and 25 mm.

TABULATIONS:

Sl.
No.

Pipe
dia.
d
m

Manometer reading
h1

h2

hm

mm of Hg

Loss
of
head

Time for
20 cm
Discharge
rise

Velocity

hf

v = Q/A

Seconds

m3/sec

m/s

Frictional
factor

1
2
3
4
5
6
7
8
9

MODEL CALCULATION:

GRAPH:
A graph is drawn between head loss due to friction and velocity (hf Vs v)
RESULT:
Thus the experiment were conducted and found that the co-efficient of ftiction of a
given pipe was _______________.

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