THE
COPPERBELT UNIVERSITY
SCHOOL OF MINES AND
MINERAL SCIENCES
DEPARTMENT OF
CHEMICAL
ENGINEERING
NAME
: DANIEL
CHEWE MPUNDU
COMP#
:
14332356
PROG
: BsC OF ENGINEERING IN CHEMICAL ENGINEERING
TASK
: EXPERINMENT #7
INSTRUCTOR
: MR CHIPILI
DUE DATE
: 7
th
MARCH 2017
SCHOOL
: SMMS

TITLE: CONSTANT AREA FIN
OBJECTIVE:
To determine the transfer coefficient between the ambient air and the fin
ABSTRACT:
INTRODUCTION:
Fins or extended surfaces are projections which stick out to ambient surroundings of
surfaces to aid heat transfer when an available surface is found inadequate to transfer the
required quantity of heat with the available temperature drop and convective heat transfer
coefficient. One application of fins is observed in radiators of automobiles and air cooled
engine cylinder heads
Heat transfer is the study of the rates of heat exchange as they occur in heat transfer
equipment. From the equation below;
Q = UA ΔT
LMTD
,
Where ΔT
LMTD
= logarithmic mean temperature difference,
A = mean surface area (πDl),
U = overall heat transfer coefficient,
It can be seen that for a given heat transfer coefficient and given fluid temperature,
The convective removal of heat from a surface can be substantially improved by
increasing the heat transfer area. One way of doing this, is to increase the area on one
side of the heat exchanger by adding extensions on that surface which projects into the
fluid; the effective heat transfer area is then increased. These extensions can take various
forms. There are many ways in which the surface of commercial heat exchange tubing
can be extended with protrusions of a kind we call a fin.
A fin is an extended surface;
protruding from a surface of a metal or wall
etc. these extended surfaces are employed to
increase the heat transfer rates from a solid to the surrounding fluid. The thermal
resistance on either sides of the heat exchanger is given by,
1/ (hA), where h = heat transfer coefficient,
Therefore, when h is very large, the resistance to heat transfer is low and hence there is
no advantage in increasing the area, one of the fluids usually has a much lower value of h
than the other and hence the resistance on this side of the heat exchanger controls the heat
transfer. It is therefore on this side that the area can be extended with advantage. In order

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- Spring '18
- Heat, Heat Transfer, Log mean temperature difference