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The free convection heat transfer using different kinds of fins is influenced by changes in geometry and interruptions in fluid flow. This paper investigates the enhancement of natural convection heat transfer using a new slitted fin configuration over the vertical plate-fin heat sink. Two different kinds of fins configurations (rectangular plain fin and slitted fin) with a constant fin spacing was selected for investigation. Aluminium with good thermal conductivity was selected for fins and five different heat inputs are considered for the analysis. The numerical results were validated with experimental results and available theoretical correlations. The various flow patterns have been examined for vertical mounted plain and slitted rectangular fin configuration. The results demonstrated that an interruption provided in plain fins reduces the weight and improves the free convection heat transfer rate. The maximum enhancement due to the addition of the slits into the fins was found to be 69%.

Free convection heat transfer analysis of slitted fin heat sink of vertical orientation using CFD