The air supply mode of the cooling fan

The heat transfer efficiency of turbulent flow is much greater than that of laminar flow, which is why it has become the mainstream design form. But the movement of the air flow is also directly related to the heat sink. In some fin designs (such as fins that are too tight), the airflow obstructed by the fin is very large, and the use of exhaust may have better results. As for the use of side blast design, there is usually no difference with the effect of the top blast. The more effective improvement method is to establish a CPU dedicated cooling air duct, so that it will not be affected by the hot air near the CPU, which is equivalent to reducing the ambient temperature.As a cooling fan, one of the centrifugal fans is the axial flow fan, and the two fans have completely different blast forms. It has also gradually begun to be used in CPU heat dissipation, often referred to as "turbofans" by computer users. The advantage of this fan is that it solves the "dead zone" problem very well. Centrifugal fans differ from traditional fans in that their blade rotation is carried out in a vertical plane, and the air intake is located on the side of the fan. The air flow received on the bottom of the radiator is evenly distributed.
There is no obstacle in the direction of the centrifugal fan, so there is the same air flow in all positions. At the same time, its wind pressure and air volume adjustment range is also larger, and the speed control effect is better. The negative effects are the same as those of high-power axial fans - high price and loud noise.
Another way to solve the wind blind area of the cooling fan is to change the direction of the fan. The traditional radiator installation method is the air flow downward, that is, perpendicular to the CPU. After the air duct design was improved, the fan was changed to blowing sideways, so that the direction of the air flow was parallel to the CPU.