This study involves an experimental investigation of pin-fin heat sinks have circular, square and diamond crosssections. Ensemble of pin-fin heat sinks with in-line and staggered arrangements were designed and tested. The fin density effect on heat transfer and friction characteristics is examined. The channel cross section is of 150 mm x 200 mm. The experiments covered the following ranges: Reynolds number 2000 to 25000, clearance ratio (C/H) 0.0 to 0.50 and inter-fin spacing ratio (Sy/d= 1.2

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... o 22.8 and Sx/d =1.2 to 10). In all, the circular pin-fin arrangement shows an appreciable influence of fin density and whereas no effect is seen in case of square fin geometry. This is associated with the unique deflection flow pattern accompanied with the in-line circular fin configuration. For the staggered arrangement, the heat transfer coefficient increases with the rise of fin density with the penalty of pressure drop. However, diamond pin-fin results the lowest pressure drop with better performance than that square configuration.