Experimentation and analysis of fins

EXPERIMENTATION AND ANALYSIS OF HEAT TRANSFER
THROUGH PERFORATED FINS OF DIFFERENT
GEOMETRY.
Visvesvaraya Technological University, Belgaum
ABHIJATH H B 4VV11ME002
AKSHAY MOHAN RAJ 4VV11ME012
DASHARATHA H S 4VV11ME024
M S SHARATH KUMAR 4VV11ME039
Under the Guidance of
Mr B B GANESH
B.E, M.Tech,
Assistant Professor
Department of Mechanical Engineering
Vidyavardhaka College of Engineering
Gokulam 3rd Stage, Mysore 570002,Karnataka, India
2014-2015

INTRODUCTION
• The removal of excessive heat from system components
is essential to avoid damaging effects of burning or
overheating. Therefore, the enhancement of heat
transfer is an important subject of thermal engineering.
• Extended surfaces (fins) are frequently used in heat
exchanging devices for the purpose of increasing the
heat transfer between a primary surface and the
surrounding fluid.

OBJECTIVE
• To increase the heat transfer between system and the
surroundings at faster rate.
• To achieve required output by reducing the weight of
the system.
• Simple in construction.
• Cheaper in cost.
• Effective cooling capability.

SCOPE
Further more geometrical variations of complex shapes and
tapered can be incorporated into fins .
This may increase the rate of heat transfer due to turbulence .
Incorporating fins made of aluminum into automobile engines
and electronic gadgets help in proper dissipation of heat to the
surrounding.

APPLICATIONS
High power engines
Integrated circuits
Aircrafts and space shuttles

MERITS
• Considerably reduces the weight of the system.
• Aluminum fins are lighter due to lower density and
are effective fin materials.
• Due to turbulence over all heat transfer is
considerably high compared to heat transfer in solid
fins.
• Perforations induce turbulence and creates critical
points of heat transfer.

DEMERITS
• Stability of perforation plays an important role.
• Sharp edges results in wearing of fin over the time.

LITERATURE SURVEY
• Perforations in the fins will increase the heat
convection from the body of the system to
surroundings.
• By varying the geometrical shapes we can achieve
higher efficiency compared to solid fin
• This not only increases the convection but also helps
in reducing the weight of the body

EXPERIMENTAL SETUP
The air duct is the housing where the fin and the heating coil assembly
are placed. It is a rectangular passage made of ply wood . It’s dimension
being 150×100×600mm.Its one end is exposed to blower and other is
open to the atmosphere.
AIR DUCT

Dimmer stator is used to regulate the input voltage. As the
voltage increases, the heat generated in the heating coil also
increases.
DIMMER STATOR
The display unit consists of three displays. One display measures the
different temperatures in the system. The other two are used to
measure the voltage and current in the circuit.
DISPLAY UNIT

Artificially, air is circulated over the fins with the help of an Air
blower . Valve varies the velocity of air in the duct .The velocity of
forced air is calculated using an Anemometer.
AIR BLOWER

•A heating element converts electricity into heat through the process of
resistive or Joule heating. Electric current passing through the element
encounters resistance, resulting in heating of the element.
•The heater is made of mica and heats upto 100
o
c
ELECTRIC HEATER

Thermally conductive tape is one of the most cost-effective heat sink
attachment materials. It is suitable for low-mass heat sinks and
relatively lower temperature. It consists of a thermally conductive
carrier material with a pressure-sensitive adhesive on each side.It
sticks the fin surface to the thermocouple.
THERMAL TAPE

The experiments have been conducted in a controlled
environment inside the laboratory. The experiment is carried out for
two different fin materials. Thermocouples are fixed to the heating
coil to measure the base temperature, freely left inside the air duct
to measure ambient temperature and to the fin to measure the fin
temperatures.
EXPERIMENTAL PROCEDURE

•The experiment is conducted by keeping the voltage constant and
varying velocity of air i.e. 4, 5, 6, 7, 8, 9, 10,11,12,13 and 14 m/s.
•Once the steady state is reached, voltmeter reading, ammeter reading
and temperature readings T1 to T5 for fins are noted down.
•The experiment is repeated for voltage value 50, 60, 70, 80, and 90
respectively

DESIGN OF FINS
Fins have a rectangular cross section of 100 x 55 and width 50 mm
It is an array containing 4 rectangular surfaces .
Every surface acts as a medium for convection heat transfer.

FINS WITH CIRCULAR PERFORATIONS
Circular through perforations are
made on the rectangular surface
of the fin.
The size of the hole being 1mm
radius
Tolerance is given at both sides to
ensure mechanical stability of the
fin.
A matrix of 3 X 4 perforations are
created on all the rectangular
surface of the fin.

FINS WITH RECTANGULAR PERFORATIONS
Rectangular fins of 5x2 cross
section are made on the
rectangular surface .
The perforation is given
chamfering at the edges to
reduce wearing and increase the
stability.
Matrix of 4x4 are made on the
fins .
A total of 64 rectangular
perforation is made . This greatly
reduces the weight of the fin.

ANALYSIS PROCEDURE
IMPORTED GEOMETRY APPLYING MESH
SELECTING THE FACE FOR HEAT FLOW SELECTING THE FACES FOR FIRST CONVECTION

SELECTING THE FACES FOR SECOND CONVECTION
TEMPERATURE DISTRIBUTION
HEAT FLUX DISTRIBUTION

THERMAL ANALYSIS
Thermal analysis shows
significant reduction in the
temperature in the case of fins
with rectangular and circular
compared to solid fins .

Sl. No Voltage
(volts)
Current
(ampere)
Velocity
m/s
Temperature T 0C
T1 T2 T3 T4
40 0.281 2 51.4 60.0 51.6 53.0
2 4 49.7 58.4 49.7 51.0
3 6 48.0 56.5 47.9 49.3
4 8 46.4 54.4 46.5 47.8
5 10 44.6 51.7 44.6 45.9
6 12 43.4 50.1 43.1 44.4
7 14 41.9 48.1 41.5 43.0
1 45 0.32 2 59.4 72.1 55.9 61.7
2 4 52.5 64.1 48.9 54.9
3 6 48.3 58.6 45.1 50.8
4 8 46.5 56.1 43.5 48.8
5 10 44.0 52.7 41.6 45.9
6 12 42.3 50.1 40.2 44.1
7 14 40.9 48.0 39.0 42.6
1 50 0.36 2 65.4 71.8 65.4 67.2
2 4 59.2 66.7 59.8 62.4
3 6 55.2 63.5 56.3 59.3
4 8 52.6 61.1 53.8 57.1
5 10 50.2 57.8 50.9 53.7
6 12 48.5 56.1 49.2 51.9
7 14 46.1 53.0 46.1 49.5
Sl. No Voltage
(volts)
Current
(ampere)
Velocity
m/s
Temperature T 0C
T1 T2 T3 T4
55 0.391 2 69.2 76.1 73.1 68.5
2 4 64.8 72.0 68.3 64.0
3 6 58.7 67.9 63.8 59.6
4 8 54.9 64.6 60.7 56.6
5 10 52.5 61.4 57.9 53.9
6 12 49.9 57.6 54.5 51.4
7 14 47.7 54.7 52.1 49.3
1 60 0.43 2 73.9 78.2 79.9 71.0
2 4 67.5 72.6 75.6 66.0
3 6 64.3 69.3 72.5 63.3
4 8 61.0 65.9 69.3 60.4
5 10 57.7 62.1 66.0 57.5
6 12 55.9 59.4 63.1 55.0
7 14 52.2 54.9 59.1 51.8
1 65 0.46 2 77.6 78.0 83.6 70.7
2 4 73.5 72.6 79.7 66.2
3 6 70.3 69.2 76.4 63.3
4 8 66.8 65.5 72.8 61.3
5 10 64.7 61.5 69.4 57.5
6 12 62.4 58.6 66.4 55.1
7 14 60.7 56.4 63.8 53.3
TABLE OF READINGS OF FINS WITHOUT PERFORATIONS (SOLID
FIN)
Sl.
No
Volta
ge
(volt
s)
Curr
ent
(amp
ere)
Veloc
ity
m/s
Temperature T
0C
T1 T2 T3 T4
70 0.491 2 80
.8
77
.8
84
.3
72
.0
2 4 78
.1
73
.3
80
.8
79
.6
3 6 76
.0
69
.6
78
.5
65
.6
4 8 74
.4
65
.7
75
.6
63
.1
5 10 71
.9
62
.4
72
.6
60
.4
6 12 68
.3
58
.2
68
.7
57
.3
7 14 64
.8
55
.4
65
.6
54
.6

Sl. No Voltage
(volts)
Current
(ampere)
Velocity
m/s
Temperature T 0C
T1 T2 T3 T4
40 0.271 2 56.1 60.5 58.9 58.1
2 4 51.3 55.8 53.0 53.6
3 6 47.8 52.3 49.4 50.7
4 8 45.8 49.5 46.8 48.4
5 10 44.1 47.5 44.9 46.6
6 12 42.8 46.3 43.9 45.5
7 14 41.1 44.5 42.0 43.7
45 0.321 2 61.4 68.7 65.8 67.3
2 4 57.8 64.7 62.3 63.3
3 6 54.3 61.1 58.0 59.5
4 8 50.0 56.7 52.6 56.0
5 10 47.9 54.7 50.2 53.5
6 12 46.3 51.8 47.2 51.0
7 14 44.7 49.2 44.8 48.9
1
50 0.35
2 66.3 75.8 66.6 73.9
2 4 58.7 66.4 57.3 65.4
3 6 57.4 62.2 54.2 61.3
4 8 54.0 58.6 50.5 58.2
5 10 52.0 56.2 48.1 56.2
6 12 49.0 53.3 45.7 53.8
7 14 48.0 51.7 44.3 52.5
Sl. No Voltage
(volts)
Current
(ampere)
Velocity
m/s
Temperature T 0C
T1 T2 T3 T4
55 0.381 2 70.3 83.6 72.4 79.8
2 4 63.0 76.0 64.8 72.1
3 6 58.5 69.5 58.1 67.2
4 8 54.5 64.2 53.0 63.2
5 10 50.5 59.6 49.4 59.3
6 12 47.4 55.7 46.1 55.7
7 14 45.3 52.9 43.9 52.8
1
60 0.42
2 79.5 87.7 71.5 83.3
2 4 72.8 79.9 65.4 79.8
3 6 65.7 72.4 54.9 74.4
4 8 60.3 68.9 51.3 71.2
5 10 57.5 65.3 48.4 67.5
6 12 55.7 63.9 46.9 65.6
7 14 51.3 59.4 45.2 63.2
1
65 0.45
2 79.5 87.7 71.5 83.3
2 4 72.8 79.9 65.4 79.8
3 6 65.7 72.4 54.9 74.4
4 8 60.3 68.9 51.3 71.2
5 10 57.5 65.3 48.4 67.5
6 12 55.7 63.9 46.9 65.6
7 14 51.3 59.4 45.2 63.2
WITH PERFORATIONS (AL)
Sl.
No
Volta
ge
(volts
)
Curr
ent
(amp
ere)
Veloci
ty
m/s
Temperature T
0C
T1 T2 T3 T4
70 0.491 2 69.
6
76
.6
61
.3
47
.3
2 4 64.
8
69
.0
57
.0
44
.7
3 6 60.
9
63
.7
54
.3
42
.0
4 8 56.
5
58
.2
51
.1
41
.0
5 10 52.
2
53
.2
48
.0
39
.0
6 12 49.
3
50
.0
45
.0
37
.6
7 14 47.
9
48
.9
43
.4
36
.8

Sl. No Voltage
(volts)
Current
(ampere)
Velocity
m/s
Temperature T 0C
T1 T2 T3 T4
40 0.291 2 56.2 48.6 56.1 48.5
2 4 54.5 46.8 55.0 46.4
3 6 52.7 45.3 52.8 45.3
4 8 51.9 44.5 52.0 43.9
5 10 50.8 43.8 51.0 42.7
6 12 49.9 42.9 50.1 42.2
7 14 48.9 42.2 49 41.7
45 0.321 2 61.4 50.8 62.5 50.3
2 4 59.2 49.0 59.9 48.7
3 6 58.1 47.8 58.5 47.8
4 8 56.2 46.1 56.7 46.3
5 10 54.8 45.0 55.2 45.4
6 12 53.5 43.9 53.7 44.4
7 14 52.0 43.0 52.5 43.5
1
50 0.35
2 66.8 54.0 67.1 54.9
2 4 65.4 52.3 65.8 53.7
3 6 64.0 50.7 64.0 52.0
4 8 62.0 49.0 62.1 48.8
5 10 60.5 47.8 60.6 48.8
6 12 58.8 46.7 58.5 47.6
7 14 57.2 45.5 56.6 46.2
Sl. No Voltage
(volts)
Current
(ampere)
Velocity
m/s
Temperature T 0C
T1 T2 T3 T4
55 0.401 2 69.6 55.9 69.9 56.8
2 4 68.2 54.0 68.5 54.9
3 6 66.8 52.5 66.9 52.9
4 8 64.9 50.8 64.9 51.9
5 10 63.0 49.9 62.8 49.8
6 12 61.3 47.9 61.3 48.6
7 14 59.0 46.2 58.6 47.5
60 0.431 2 73.5 60.8 74.4 59.6
2 4 71.7 57.4 72.0 57.1
3 6 69.9 54.9 70.3 55.6
4 8 68.0 52.9 68.3 53.9
5 10 66.4 51.2 66.5 52.5
6 12 64.4 49.5 64.0 51.0
7 14 62.5 48.3 62.1 49.7
1
65
0.47
2 77.6 59.7 78.1 61.7
2 4 76.0 58.4 76.3 59.5
3 6 74.8 57.4 75.0 58.1
4 8 72.6 55.4 72.3 56.0
5 10 69.6 53.1 69.0 54.0
6 12 67.8 51.9 67.1 52.9
7 14 65.8 50.2 65.2 51.6
Sl.
No
Volta
ge
(volts
)
Curr
ent
(amp
ere)
Veloci
ty
m/s
Temperature T 0C
T1 T2 T3 T4
70 0.481 2 80.
9
61.
3
81.
6
64.
9
2 4 78.
9
59.
4
79.
5
62.
9
3 6 76.
8
57.
4
76.
3
61.
0
4 8 74.
7
55.
5
74.
2
58.
9
5 10 72.
7
53.
8
72.
3
57.
4
6 12 70.
6
52.
2
70.
1
55.
5
7 14
68.
6
50.
8 68.
3
54.
3
SOLID FIN (CU)

Sl. No Voltage
(volts)
Current
(ampere)
Velocity
m/s
Temperature T 0C
T1 T2 T3 T4
40 0.291 2 58.9 59.0 53.9 39.8
2 4 57.5 57.5 52.7 39.5
3 6 56.0 55.4 50.7 39.2
4 8 53.8 53.0 48.7 38.9
5 10 52.6 51.7 49.0 38.0
6 12 51.3 50.3 46.5 37.8
7 14 50.1 49.1 44.4 36.4
45 0.321 2 63.0 61.4 58.1 43.3
2 4 61.7 59.8 56.9 40.3
3 6 59.8 57.9 55.4 37.8
4 8 57.7 55.9 53.3 36.8
5 10 56.0 54.1 51.6 36.2
6 12 54.4 52.4 50.0 35.5
7 14 52.0 43.0 48.4 34.7
1
50 0.34
2 67.3 64.8 62.1 46.9
2 4 65.3 62.4 59.5 45.0
3 6 63.5 60.4 57.6 43.2
4 8 61.5 58.3 55.6 41.6
5 10 47.8 60.6 48.8
6 12 58.8 46.7 58.5 47.6
7 14 57.2 45.5 56.6 46.2
Sl. No Voltage
(volts)
Current
(ampere)
Velocity
m/s
Temperature T 0C
T1 T2 T3 T4
55 0.401 2 72.2 68.4 66.5 50.5
2 4 69.9 65.5 63.4 47.3
3 6 66.9 63.2 61.0 45.7
4 8 64.2 60.9 58.8 42.7
5 10 62.0 58.5 55.6 38.9
6 12 60.0 56.6 53.6 36.0
7 14 58.0 55.0 51.6 35.0
60 0.431 2 75.5 71.0 67.8 44.3
2 4 72.7 68.8 65.5 42.4
3 6 70.8 67.4 63.8 40.7
4 8 68.7 65.1 62.0 40.5
5 10 65.7 62.4 60.1 40.0
6 12 63.8 60.3 58.3 39.7
7 14 61.8 58.4 56.8 38.1
1
65 0.46
2 79.2 74.6 73.4 49.0
2 4 75.8 71.8 70.3 45.8
3 6 73.5 69.4 68.1 44.8
4 8 71.7 67.5 66.3 43.6
5 10 69.9 65.5 64.4 42.6
6 12 67.8 63.5 62.4 40.9
7 14 65.6 61.4 60.3 39.1
Sl.
No
Volta
ge
(volts
)
Curr
ent
(amp
ere)
Veloc
ity
m/s
Temperature T
0C
T1 T2 T3 T4
70 0.491 2 83
.8
78
.0
76
.8
52
.0
2 4 80
.0
73
.8
72
.0
48
.8
3 6 78
.8
72
.7
71
.0
46
.8
4 8 76
.4
70
.5
69
.1
45
.6
5 10 72
.4
67
.9
67
.3
44
.3
6 12 69
.6
65
.5
65
.3
41
.6
7 14
67
.1
63
.3 62
.9
40
.3
CIRCULAR PERFORATED FIN (CU)

SL. NO ITEM COST(Rs)
1 WOODEN DUCT 250
2 ELECTRIC HEATER 1000
3 THERMAL TAPE 750
4 THERMO COUPLES 250
5 MACHINING 2000
6 ASBESTOS SHEET 100
TOTAL 4450
COST DETAILS

Experimentation and analysis of fins

More Related Content

What's hot

What's hot (20)

Similar to Experimentation and analysis of fins

Similar to Experimentation and analysis of fins (20)

More from SharathKumar528

More from SharathKumar528 (20)

Recently uploaded

Recently uploaded (20)

Experimentation and analysis of fins