Numerical Study on the Effects of Fan Configurations on Thermal Performance of a Piezo Fan

• Main Author: 林子棠
• Other Authors: 黃柏文
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/28475410595084972773

碩士 === 逢甲大學 === 航太與系統工程學系 === 104 === This study employed the computational fluid dynamics software CFX to simulate the cooling performance of piezoelectric fan. For piezoelectric fan cooling, the main parameters studied in the surveyed literature include location, driving amplitude and frequency of the piezoelectric fan, and the distance between the heat source and the fan. In this study, these parameters are set according to previous experimental study and the area of blades is fixed to analyze the cooling effect of piezo-fan with different configurations (truncate, small-forked, large-forked and rectangular blade). In this study, the design of blade configuration inspired by the application of biomimetic fin, which is a technology usually used to improve the ship propulsion efficiency. The designed blades, which are similar to caudal fins of fish, are adopted as the piezo-fan blade to compare with traditional rectangular blade for their cooling performance. Based on the simulation results obtained in this study, it was found that there are more heated area swept by a piezo-fan with truncate blade than a traditional rectangular blade and therefore more airflow can be driven for cooling. Although the sweeping area of the piezo-fan with small- and large-forked blades is similar to the truncate blade, their cooling performance is less than the truncate one for their geometric characteristics. By observing the flow structure, we can found that the velocity and vorticity fields induced by piezo-fan with truncate blade are stronger than the others so better cooling performance can be achieved.