本論文主要利用商業套裝軟體CFD-ACE+建立雙壓電風扇模型，透過拉凡格式法並以降低鰭片之平均溫度為目的來反算出其最佳化之雙扇葉相對位置以及最佳化之相位角差。
在第三章中吾人針對兩扇葉以葉邊對葉邊擺放方式探討相同方向擺動(同相)以及相位角差180度擺動(反相)的流場，利用套裝軟體CFD-ACE+進行數值模擬計算，並利用質點影像量測法（Particle Image Velocimetry）實驗來加以驗證。
在第四章中為了求得在四種不同散熱鰭片中雙壓電風扇的最佳相位角差以及最佳擺放位置，吾人利用反算法－拉凡格式法(LLM)並結合套裝軟體CFD-ACE+設計得到最佳相位角差以及最佳擺放位置，以提高風扇的散熱效率來降低鰭片之平均溫度。
在第五章中，吾人利用實體壓電風扇與紅外線熱像儀進行實驗來加以驗證數值模擬結果的準確性。

The objective of this thesis is to utilize the commercial package CFD-ACE+ to build a three-dimensional computational model for dual piezoelectric fans, then apply the technique of Levenberg–Marquardt Method (LMM) to estimate the optimal phase angle and relative positions of two piezoelectric fans to minimize the average fin temperature. Two piezoelectric fans are originally placed in four different fins, namely, cases A, B, C and D, respectively; the LMM is then utilized to estimate the optimal phase angle and locations of two piezoelectric fans to improve its thermal performance. The simulations of numerical experiments show that for all of these four different original fans designs, the optimal fans design occurs at one result, when the phase angle between two fans is in phase which obtains the best thermal performance. Finally, temperature distributions of the fin with the original and optimal fan designs are measured using a thermal camera and are compared with the numerical solutions to justify the validity of the present estimation for the optimal dual fans design problem.

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