In general, the higher the fan speed, the greater the air volume. The cooling fan generates airflow by rotating the blades, and an increase in speed causes the blades to push more air per minute, and when more air can be pushed, the volume of air will also increase. So when customers pursue high air volume, they often choose high rpm exhaust fans.

(12038 DC fan is used as an example.)

It should be noted that although there is a positive correlation between speed and air volume, the relationship is not linear. In some cases, as the rotational speed increases, the increase in air volume may slow down. This is due to the influence of the fan's design and performance characteristics as well as hydrodynamic effects.

Hydrodynamic effects are physical phenomena and behaviors that occur when involving the movement of fluids, such as air. First of all, when the fan rotates, there will be resistance between the blade and the air, and the larger resistance will reduce the air volume, while the smaller resistance will increase the air volume. In addition, the shape and Angle of the fan blades also affect the pressure difference of the air, which in turn affects the size of the air volume.

Secondly, during the operation of the fan, the turbulence generated by the rotating blade will lead to the instability of the air flow, thus reducing the air volume. The shear layer will form higher and lower velocity airflow regions, which will also affect the distribution and size of the air volume.

In addition, the design of the import and export area, boundary layer effect and fan rotation will have an impact on the fan; And other factors of the cooling fan, such as blade design, blade number, fan diameter and motor power, will also affect the air volume.

Guangdong Chungfo Electronic Technology Co., Ltd. is dedicated to the equipment cooling needs of various industries, is a professional cooling fan manufacturer. If you are looking for axial cooling fans, cross flow cooling fans or other types of cooling fans, please feel free to contact us.