The rectangular fin with single-step change
has been found to be the most efficient fin profile in terms of maximum heat loss and fin efficiency. The optimum fin dissipated ∼3.4% more heat and provided 2% higher efficiency than the CRF profile.
Which fin is best for heat transfer?
Staggered arrangement produces higher heat transfer and friction factor than inline fin. Moreover,
the rectangular fin
is the best in terms of high heat transfer however the drawback of high friction factor leads the fin to have the least efficiency of all.
How do you determine fin effectiveness?
The fin efficiency is defined by the division of the actual by the theoretical heat transfer, that is, (9.35) (9.36) The actual heat flow is calculated by
multiplying the fin outer surface area by the fin efficiency
.
What is effective fin?
Efficiency of fin (ηfin):
The efficiency of a fin is defined as
the ratio of the actual heat transfer from the fin to that the heat that would be dissipated if whole surface of the fin is maintained at base temperature
.
Which type of cooling fins are most preferable?
Which type of cooling fins are most preferable? In most high performance applications, fins are made of copper or aluminum.
Aluminum fins
are preferred in aircraft electronic liquid cooling applications due to their lighter weight.
Which material is ideal for making a fin?
Aluminium
is one of the most frequently used materials for fin due to its higher thermal conductivity and comparatively low cost. Triangular shape is best from point of view of heat transfer to weight ratio. Length of fin would depend upon the rate of heat transfer.
What is M in heat transfer?
Unsteady state heat transfer
we arrive at a general expression for the temperature change: … The last term m is the
relationship between the thermal conductivity (k) and the overall heat transfer coefficient (h)
.
Can fin effectiveness be less than 1?
The fin efficiency will always be less than one
, as assuming the temperature throughout the fin is at the base temperature would increase the heat transfer rate. … This is the efficiency for an array of fins.
What is the importance of fin effectiveness?
It is
essential to evaluate the performance of fins to achieve high heat transfer rate or minimum weight etc
. Fin effectiveness, fin efficiency and total efficiency are some methods used for performance evaluation of fins. This quantity is more often used to determine the heat flow when variable area fins are used.
What is the difference between fin efficiency and effectiveness?
Therefore, the
fin effectiveness can be determined easily when
the fin efficiency is known, or vice versa. The thermal conductivity k of the fin material should be as high as possible. The overall effectiveness is a better measure of the performance of a finned surface than the effectiveness of the individual fins.
What are the different types of fins?
For each fish, generally, there are five main fins follows:
Dorsal, Pelvic, Caudal (tail), Anal and Pectoral
as shown in Fig. 1. Dorsal fins are located either on the back of the fish or its top, it helps the fish during sharp turning or stops.
Which type of design of fins is more effective?
The rectangular fin with single-step change
has been found to be the most efficient fin profile in terms of maximum heat loss and fin efficiency.
How do fins work?
Foil shaped fins
generate thrust when moved
, the lift of the fin sets water or air in motion and pushes the fin in the opposite direction. Aquatic animals get significant thrust by moving fins back and forth in water. … Fins can also generate thrust if they are rotated in air or water.
Which area is considered in application of Newton’s law of cooling?
Newton‟s law of cooling is generally limited to simple cases where the mode of energy transfer is convection, from a solid surface to a surrounding fluid in motion, and
where the temperature difference is small, approximately less than 10o C
(The Encyclopedia Britannica, 1910).
Which material is used in engine fins?
Standard materials used for commercial engine fins are
Aluminium alloy A204
of thermal conductivity of 120 W/m-k. Here analysis of the heat transfer characteristics of engine fins is done by using these following materials namely Aluminium 6061, Aluminium 356 and Aluminium 204.
Why is aluminum a good fin material?
Answer:
Good corrosion resistance, formability and high thermal conductivity
make aluminium an ideal material for the construction of these heat exchangers. … Over the last few years the requirements for aluminium fin stock have become more demanding.
