Numerical modelling of Heat Transfer Enhancement By Coupled Corona Wind and Electrostatic Force-Induced Vibration

• Main Authors: Hung, Yu-Jie, 黃鈺傑
• Other Authors: 崔燕勇
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/gjnn52

碩士 === 國立交通大學 === 機械工程系所 === 105 === Regarding a new design of electrostatic vibration to ion wind cooling device,with use of finite volume method a numerical method is developed to simulate the flow field coupling with electric field. The mechanical vibrations through the high-voltage make use the electrostatic adsorption force will vibrate the metal blade to act as the piezoelectric fan.The proposed electrostatic force-induced vibration cooling design features a hybrid effect which combines electrostatic vibration and ion wind.The ion wind by electrostatic vibration can enhance heat transfer efficiency. Compared with experiment results, the numerical results are the approximate trend, but the temperature at middle of heater is generally lower. The main error is caused by that in the simulation case we only consider one side of the heater as heat source without considering the energy loss from other sides. In the simulation case, the condition of heat loss is different with the real case. In the end, we compare with the temperature of only corona wind cooling and electrostatic force-induced vibration hybrid cooling at the middle of heater.The corona wind cooling has better performance than hybrid cooling at the middle of heater,but hybrid cooling still have close performance with corona wind and lower power consumption.Observe the average surface temperature of heater from the results of simulation,the hybrid cooling performance compare well with corona cooling due to the effect of the electrostatic force-induced vibration.