Experiment On Heat Transfer Through Fins Having Different Notches

Mechanical Engineering

Abstract: Extended surfaces, commonly known as fins, often offer an economical and trouble free solution many situations demanding natural convection heat transfer. Heat sinks in the form of fin arrays onhorizontal and vertical surfaces used in variety of engineering applications, studies of heat transfer andfluid flow associated with such arrays are of considerable engineering significance. The main controllingvariable generally available to designer is geometry of fin arrays. Considering the above fact, naturalconvection heat transfer from vertical rectangular fin arrays with and without notch at the centre have been investigated experimentally and theoretically. Moreover notches of different geometrical shapes have also been analyzed for the purpose of comparison and optimization. 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. In the present study, the fin flats are modified by removing the central fin portion by cutting a notch. This paper presents an experimental analysis of the results obtained over arrange of, fin heights and heat dissipation rate. Attempts are made to establish a comparison between the experimental results. Key-words: Fin, notches.

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