Study of a Radial-flow Multiple Magnetically Coupled Fan System with One Piezoelectric Actuator

• Main Authors: Chia-Hsing Hsieh, 謝佳興
• Other Authors: Hsiao-Kan Ma
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/y7nqwm

碩士 === 國立臺灣大學 === 機械工程學研究所 === 105 === With manufacturing process advancements, the size of electronic devices keeps shrinking, which results in a higher heat flux. To maintain a desirable lifetime and good performance for electronic devices, it is necessary to maintain the operating temperature below a certain threshold. Traditional cooling techniques might be unsuitable for next generation electronic devices. Therefore, innovative cooling techniques must be developed. Piezoelectric fans and their feasibility of cooling electronic devices have been widely studied. However, there are few studies that address using a single piezoelectric actuator to generate radial air flow. In this study, a radial-flow multiple fan system was developed. This system only used one piezoelectric actuator and a magnetic repulsive force to activate up to 20 fans, which featured low power consumption and a large cooling area. To find the optimal design for the RMFS, the influence of some geometric parameters was investigated. Besides, the performance of different designs was compared with commercially available axial fan. The results showed that the design E had the best thermal performance among the designs because of its relatively large frequency and amplitude. The thermal resistance and the percentage improvement under a 35 W heat flux were 0.86 K/W and 36.9 %, respectively. In addition, a coefficient of performance (COP) was defined. The COP of design E was approximately 3.5 times that of the rotary fan. For the power consumption aspect, the RMFS is more efficient than the rotary fan.