Experimental Investigation of Parameters Influencing the Performance of Pin Fins under Forced Convection

This work performed the experimentation to study the heat transfer characteristics over a flat surface equipped with hollow cylindrical cross-sectional pin fins in a rectangular channel under forced convection. The channel has a cross-sectional area of 100 mm x 250 mm. The experiments covered the following ranges: Inter pin-fin spacing ratio (Sy/D) 3.33, 4 and 4.66, pin-fin number in stream-wise direction (Nfy) 2, 3 and 4, clearance ratio (C/H) 0, 0.5 and 1, flow velocity (U) 2 m/s, 3 m/s, and 4 m/s, internal diameter of pin fin (d) 4 mm, 5 mm and 6 mm . Nusselt number is considered as performance parameter. The full factorial method of design of experiment (DOE) with 5 factors and 2 levels is used for the sequence of experimental trials. The analysis is done with regression method and correlation equation is obtained using estimated effects and coefficient analysis. Keywords - Heat transfer characteristics, full factorial method, hollow pin fins, performance parameter, forced convection.