The experimental results in Fig. 5 suggest that the pin fins provided the highest heat transfer rate and
the least time to mold parts. This is due to the fact that, based on the total volume; the pin fin has the
largest total surface area (Table 2), and heat transfer rate is increased by increasing the surface area
across which the convection occurs. Surprisingly, despite the total surface of the triangular fin being
smaller than that of the pin fin, the triangular fin exhibited about the same heating/cooling efficiency
as that of the pin fin. This may be because the entire potential heat transfer surface has been fully utilized in the fins. For pin fins, part of the surfaces, especially the surfaces that face the opposite direction of the airflow, may not be exposed very well to the air. On the contrary, based on the rotating direction of the mold, the surfaces of the triangular fins were fully utilized
(see Figs. 2 and 3). Triangular fins thus exhibit similar efficiency as that of pin fins