关键词: 风扇；散热器；宽高比；换热特性

Abstract: In order to study the heat transfer characteristics of fan and radiator assembly, this paper conducts a systematic study on single and double fans and radiators with different aspect ratios based on 3D computational fluid dynamics software, and conducts a comparative analysis of the test results to verify the accuracy of the model and obtain the influence rules of different factors on heat transfer. The results show that under the wind speed of 2～5 m/s, for the studied fan and radiator assembly structure, the heat transfer of the radiator of the same size matching single fan is slightly higher than that of the double fan, and the heat transfer performance is better. Moreover, with the increase of wind speed, the increase of heat transfer shows a slowing trend, and the difference between single and double fan heat transfer first increases and then decreases. With the increase of the aspect ratio, the heat transfer increases, and the velocity uniformity of the air side decreases. When the width of the radiator core increases to a certain value, the velocity uniformity tends to rise.

Key words: fan; heat sink; aspect ratio; heat transfer characteristic