24V DC Cooling Fan cooling gas flow

In the "24V DC Cooling Fan" radiator heat conduction itself there is a very important factor: the gas flow. The figure above, the gap between the bar and the cylindrical fin fin lies in the different process gas flows. In the cylindrical fin around because airflow resistance encountered by small flow more easily able to take away more calories around the cylinder fins, and enhance the "24V DC Cooling Fan" convection effect. Therefore, in the same heat sink area, the cylindrical cooling effect will be better than the bar. Airflow for cooling fins to walk around fully have a great impact. Fin design flow more easily be able to get the high heat capacity diverges. This means that the "24V DC Cooling Fan" arrangement of fins for heat dissipation and appearance has a significant relationship. ?