Numerical Analysis for a Novel Cooling Fan Applied on Notebook Computers

• Main Authors: Hsu, Feng-lin, 許豐麟
• Other Authors: Lin, Sheam-chyun
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/19681812623678980706

碩士 === 國立臺灣科技大學 === 機械工程系 === 88 === A comprehensive numerical study is performed for the flowfields associated with a novel cooling fan to solve the heat dissipation problem of notebook computers. This novel design is composed of an axial-flow rotor and a centrifugal housing to generate the required volume flow rate with high-pressure and low-noise characteristics. At first, with the aids of NACA airfoil and theoretical analysis, a 44.5×44.5×9 mm cooling fan is designed to match the performance of commercial products (44.5×44.5×10 mm), which is 1 mm thicker than this novel design. Later, the corresponding flowfield is carefully examined through numerical outcomes to yield necessary fan modifications. Additionally, a parametric study on fan geometry is executed to enhance the overall performance of this cooling fan. The parameters considered here include blade number, drilling holes on housing, and adding a second flow channel between housing and rotor back-plate. Regards experimental verification, the performances are carried out in AMCA 210-85 test chamber and semi-anechoic chamber. From experiments, drilling holes on housing shows 11.26% increase on static pressure, which is agree with numerical results. Besides, significant increments on volume flow rate are found for all cases with a second flow channel. The enhancement is increasing linearly as the size of second flow channel expands. A maximum improvement (32.62%) is observed for adding a flow channel with 3 mm thickness. Moreover, the corresponding influences and associated flowfields caused by the above parameters are analyzed and discussed extensively. Noteworthy, the numerical outcomes are correlated well with the experimental results for all cases studied. Consequently, this study may offer a reliable design tool to generate a cooling fan for fulfilling the cooling demand of notebook computers.