The Study of Multiple Piezoelectric-Magnetic Fan System in the Interior of Heat Sink

• Main Authors: Yen-Feng Li, 李彥鋒
• Other Authors: 馬小康
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/38190761632044353836

碩士 === 國立臺灣大學 === 機械工程學研究所 === 102 === In this study, multiple piezoelectric-magnetic fans cooling system is applied on the thermal management of Light-emitting diodes lamp (module A) and CPU chip(module B). The multiple piezoelectric-magnetic fans system composed of one piezoelectric fan and two magnetic blades. By applying the piezoelectric effect, magnetic effect and resonance effect, multiple piezoelectric-magnetic fans system induces force convection by fast vibration. The experimental results show the application of carbon fiber sheet as magnetic fan have the advantage of higher Young’s modulus and low density. The thermal resistance is 0.82℃/W comparing with the PVC performance of 1.13℃/W under 25W LEDs lighting. Changing the material for blade can decrease the thermal resistance by 27.4%. Carbon fiber sheet is proved to be a nice choice for blade to replace the original usage of PVC. In module A with T shape blade design, the temperature of LEDs substrate can drop from 68.7℃ to 45.2℃. The thermal resistance with T shape blade design is 2.47℃/W comparing with no T shape blade design of 3.64℃/W. T shape blade design can decrease the thermal resistance by 32.1% In module B, the combination of mylar and carbon fiber increases resonance frequency. The optimum ratio is 2:8 and 3:7 whose thermal resistance is 1.4℃/W. The efficiency of T shape blade design and extra magnetic force are also tested in this module.