The effectiveness of the fin is the dimensionless parameter which can be measured the ratio of the heat transfer from the fin to the heat transfer occupied by the fin without fin attached.
What is fin efficiency and effectiveness?
Fin efficiency, η
Fin efficiency is defined as the ratio of heat dissipation by the fin to the heat dissipation takes place if the whole surface area of the fin is at the base temperature Tw.
What is meant by fin effectiveness?
2 Fin Efficiency and Surface Effectiveness. Fin efficiency is defined as the ratio of actual heat flow of the fin to that which would be obtained with a fin of constant temperature uniformly equal to the base surface temperature , that is, one with infinite thermal conductivity.
What is the difference between fin efficiency and fin 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 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.
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 an ideal fin?
An ideal fin is the one whose temperature is equal to temperature of the surface . This is possible only if the thermal conductivity of fin material is infinitely high. The effectiveness of an actual fin material is always lower than an ideal fin.
How do you calculate fin effectiveness?
- The fin efficiency is defined as the ratio of the heat transfer to the fin to the heat transfer to an ideal fin. ηth =
- qfin. hAfin(Tb − T∞) , Tf = T∞,and Afin = 2Ac + Atip (Square and Recatngular ) 1.35.
- Atip = t × W. Fig. 2.4. Rectangular Fin. For cylindrical: Afin = πDL +
Which material is ideal for making a fin?
Aluminum and copper are one of the most frequently used materials for fin.
Under what condition does fin efficiency become 100%?
Under what situations does the fin efficiency becomes 100%.
The heat transfer from the fin will be maximum. For the cases of a constant cross-section of very long fins and fins with insulated tips , the fin efficiency can be 100.
Why fin is insulated at tip?
“Fin is insulated at the tip”. What does that mean? Explanation: The fin is of finite length with the tip insulated and so no heat is transferred from the tip.
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.
What is difference between effectiveness and efficiency?
Efficiency and effectiveness are not the same thing. Efficiency is defined as the ability to accomplish something with the least amount of wasted time, money, and effort or competency in performance. Effectiveness is defined as the degree to which something is successful in producing a desired result; success.
What is the significance of fin?
The thermal conductivity and heat transfer coefficient are modeled as linear and power law functions of temperature respectively. The fin tip dissipate heat to the ambient temperature by convection and radiation .
What is a fin used for?
A fin is a thin component or appendage attached to a larger body or structure. Fins typically function as foils that produce lift or thrust , or provide the ability to steer or stabilize motion while traveling in water, air, or other fluids.
What makes a good fin heat transfer?
Typically, the fin material has a high thermal conductivity . The fin is exposed to a flowing fluid, which cools or heats it, with the high thermal conductivity allowing increased heat being conducted from the wall through the fin.
