project base presentation.

1. A P R O J E C T S E M I N A R
ANALYSIS OF EXTENDED SURFACES
SUBJECTED TO FORED CONVECTION.
Sinhgad Institute of Technology, Lonavala
Department of Mechanical Engineering
1
GROUP NO:- C-09 Guided By
Prof. C.C.DUBE

2.  PRESENTED BY,
1. RUGWED V.BURSE
2. SANJOG S. PURAO
3. CHANDRAPRABHU B. VYAVHARE

3. CONTENTS
 INTRODUCTION
 PROBLEM STATEMENT
 OBJECTIVE
 METHODOLOGY
 FUTURE SCOPE
 EXPERIMENTAL SETUP
 SETUP COMPONENTS

4. INTRODUCTION
 Convection heat transfer between a hot solid surface and the surrounding colder fluid is
governed by the Newton’s cooling law which states that “the rate of convection heat transfer
is directly proportional to the temperature difference between the hot surface and the
surrounding fluid and is also directly proportional to the area of contact or exposure
between them”. Newton’s law of cooling can be expressed as
Qconv = h A (Ts-T∞ )
Where,
h = convection heat transfer coefficient
Ts = Hot surface temperature
T∞ = Fluid temperature
A = area of contact or exposure
 Therefore, convection heat transfer can be increased by either of the following ways-
1. Increasing the temperature difference (Ts- T∞ ) between the surface and the fluid.
2.Increasing the convection heat transfer coefficient by enhancing the fluid flow or flow velocity
over the body.
3.Increasing the area of contact or exposure between the surface and the fluid.

5.  Most of the times, to control the temperature difference is not feasible and
increase of heat transfer coefficient may require installation of a pump or a fan
or replacing the existing one with a new one having higher capacity, the
alternative is to increase the effective surface area by extended surfaces or fins.
 Fins are the extended surface protruding from a surface or body and they are
meant for increasing the heat transfer rate between the surface and the
surrounding fluid by increasing heat transfer area.

6. PROBLEM STATEMENT
 As per the above literature survey we aim that by changing
the different geometries of the fins we get more effeciency
and effectiveness of the fins. If it is tested in the test rig we
get the different readings on our various designed fins.

7. Example of surfaces where fins are used
 1. Air cooled I.C. engines
 2. Refrigeration condenser tubes
 3. Electric transformers
 4. Reciprocating air compressors
 5. Semiconductor devices
 6. Automobile radiator

8. OBJECTIVES
 To increase the overall heat transfer rate of various
geometrical designed fins.
 To study the heat transfer characteristics using different
geometrical fins.
 To design and fabricate the test rig.
 To analyze the efficiency and effectiveness of the setup.

9. METHODOLOGY
Following methodology we used:
 Theoretical calculation for finding out convective heat
transfer rate
 Analytical analysis
 Experimental analysis
 Comparing experimental & analytical analysis.
 Conclusions.

10. FUTURE SCOPE
1. Micro and macro electric components cooling.
2. Inductive evaporative cooling.
3. Gas turbine internal airfoil cooling.
4. Biomedical fields.
5. The material used for test plate was aluminum It can be
changed to steel or any other suitable material according to
its application.
6. Different shapes of dimple cavity like triangular, leaf shape
tear drop shape etc. can be used.

11. EXPERIMENTAL SETUP

13. SETUP COMPONENTS
 FAN
 THERMOCOUPLE
 FINS
 DUCT
 HEATER
 DIMMERSTAT

14. SPECIFICATION
FAN:
Current- 0.39
Voltage- 220-240 volt
Volume rate-2.3 cb.m/min
Power-550 watt
Speed-800 rpm
Qty- 1 Nos

15. THERMOCOUPLE:
Type- K type
Range- 0 deg celcius to
1500 deg celcious
Qty- 4

16. FINS:
 Material used: copper,Aluminium and Composite
material
 Shapes: Rectangular & Trapezoidal

18. DUCT:
Material used: Stainless steel sheet
Diemensions: 15x15cm and length of 100cm

19. HEATER:
 Aluminium maximum
working temperature 300 deg C
 watt density up to
25w sq inches (4w sq cm).
 Mild Steel and Stainless Steel maximum working
temperature 600 deg C

20. THANK YOU !