REVIEW PAPERFINAL - HEAT TRANSFER ENHANCEMENT BY PERFORATING A REVIEW Aju Joseph Amal Dev C George Aneesh K Dept of Mechanical Engineering Jyothi

REVIEW PAPERFINAL - HEAT TRANSFER ENHANCEMENT BY...

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HEAT TRANSFER ENHANCEMENT BY PERFORATING: A REVIEW Aju Joseph Dept. of Mechanical Engineering Jyothi Engineering college, Cheruthuruthy, Thrissur,Kerala, India-678531 Amal Dev C George Dept. of Mechanical Engineering Jyothi Engineering college, Cheruthuruthy, Thrissur,Kerala, India-678531 Aneesh K Dept. of Mechanical Engineering Jyothi Engineering college, Cheruthuruthy, Thrissur,Kerala, India-678531 Fibin Shafi Dept. of Mechanical Engineering Jyothi Engineering college, Cheruthuruthy, Thrissur,Kerala, India-678531 Jijo Joseph Dept. of Mechanical Engineering Jyothi Engineering college, Cheruthuruthy, Thrissur,Kerala, India-678531 Arun Raj A Dept. of Mechanical Engineering Jyothi Engineering college, Cheruthuruthy, Thrissur,Kerala, India-6785 ABSTRACT- Fin heat sinks are a great deal to increase heat transfer in applications such as cooling of electronic components, (Integrated processing units, chipset and hard disk drives), heat exchangers ,engines etc and can sometimes be an economical solution to heat transfer problems. Perforated heat sink gives higher heat transfer rate compared to solid fin heat sink by varying the different parameter like shape of fin, diameter of Perforations ,number of Perforations higher heat transfer rate can be accomplished. The present paper reviews the literature which deals with heat transfer enhancement by using perforations . INTRODUCTION Heat sink is a device which absorbs the heat from heated component and dissipates heat to surrounding air. The removal of excessive heat from system components is essential to avoid the damaging effects of burning or overheating .Fins are surfaces that extend from an object to increase the rate of heat transfer to or from the environment by increasing convection. The amount of conduction, convection, or radiation of an object determines the amount of heat it transfers. Air cooling is the most widely used technique for heat rejection. Heat sink dissipates heat to surrounding air by convection. In forced convection heat dissipated by means of some external sources such as fans. In natural convection, the extended surfaces are used which increases surface area by adding fins to the surface in order to achieve required rate of heat transfer. Heat transfer from a pin fin heat sink depends on many parameters; shape and size of the fins, spacing between the pin fins, number of pin fins, perforation number, perforation diameter,thermal conductivity, the type of flow and the fluid, temperature difference between the heat sink and the fluid. Fins are used in a large number of applications to increase the heat transfer from surfaces. Typically, the fin material has a high thermal conductivity. The fin 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.
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