The extended surfaces known as fins are used for the heat transfer purpose in various instruments like heating and cooling equipments. Fins offer an economical and trouble free solution in many situations demanding natural convection heat transfer. Heat sinks in the form of fin arrays on horizontal and vertical surfaces used in variety of engineering applications, studies of heat transfer and fluid flow associated with such arrays are of considerable engineering significance. The main controlling variable generally available to designer is geometry of fin arrays. In a lengthwise short array, where the single chimney flow pattern is present, the central portion of fin flat becomes ineffective due to the fact that, already heated air comes in its contact. A stagnant zone is created at the central bottom portion of fin array channel and hence it does not contribute much in heat dissipation. Hence it is removed in the form of inverted notch at the central bottom portion of fin to modify its geometry for enhancement of heat transfer. The comparison of experimental and computational analysis is done and results are well matching. It is found that the average heat transfer coefficient for inverted notch fin arrays is higher as compared with normal fin array. applications, motors and transformers. The current trend in the electronic industry is miniaturization, making the overheating problem more acute due to the reduction in surface area available for heat dissipation. Further enhancement in heat transfer can be obtained by proper selection of form of extended surface or by making some modifications in the geometry of surfaces like dent marks, grooved or different types of notches, etc. The fin which gives single chimney flow pattern that fin will good for heat transfer rate. Fins are of two types without notch fins and with notch fins. Notch fins gives more heat transfer rate than without notch fins because single chimney flow pattern is more in notch fins.
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