Abstract: The present experimental study focus on the design and analysis of perforated rectangular fin array with varying percentage of perforation. Recently the fins are commonly used to increase the heat transfer rate between the surrounding fluid and surfaces in heat exchange appliances. Various fin geometries available with different shape, size and perforation, in this experiment we use the rectangular fins having different percentage of perforation such that plane, 10%, 20% and 30% of perforation. The effects of perforations and base-to-ambient temperature difference on the heat transfer performance of fin arrays were observed and optimum value of perforation is suggested. The experimental set-up was employed during experiments in order to take measurements from 4 different fin configurations having fin lengths of 180 mm and fin height of 20 mm. Fin spacing was maintained fixed at 7.45 mm. Fin thickness is 3 mm. 5 heat inputs ranging from 25 W to 67.5 W were supplied for all fin configurations, and hence, the base and the ambient temperatures were measured in order to evaluate the heat transfer rate from fin arrays. The CFD analysis can be done by using above parameters and fin configuration. The results of experimental as well as CFD analysis have shown that the convection heat transfer rate from fin arrays depends on all percentage of perforation and base-to-ambient temperature difference. Analysis gives the idea about heat transfer and behaviour of perforated fins. The effect of flow visualization also cleared the heat transfer by chimney flow pattern. From above analysis we get 30% perforation gives more heat transfer than other perforation.

Keywords: Perforation, Fins, Steady state, Natural convection, CFD