The properties of new serrated fins were numerically investigated to improve the heat transfer properties of a serrated fin radiator while controlling the increase in pressure drop loss. The effects of different fin surfaces

windward surface structures

and dimensional parameters on the heat transfer Nusselt number Nu

pressure loss Δp

and overall performance η were analyzed. The results indicate that the heat transfer performance has a trivial dependence on the shape of the grooves or bumps on the fin surface; however

the circular shape has the least increase in pressure loss and the best overall performance. Owing to the circular grooves and bumps on the fin surface

the windward surfaces of the fin are changed to circular; this can improve heat transfer

reduce pressure loss

and improve overall performance by as much as 12.2%. The balance between heat transfer and pressure loss is optimal for the circular grooves and a bumps size R = 0.15 mm

and the average pressure loss remains the same as that of the conventional serrated fin

with an average improvement of 8.7% in both heat transfer and overall performance.