非結構性網格較易處理複雜幾何外形且對可調性網格技巧之使用具有方便性，故其在計算流體力學之領域上實為重要。為著有效處理複雜幾何外型之問題，本文採用CATIA電腦輔助設計軟體以建立所需的幾何外型及表面三角形網格。利用此表面三角形網格和劉及黃所發展之網格建立法，在整個流場區域中建立非結構性四面體網格。由於非結構四面體網格較難有效處理邊界層問題，因此在物體表面附近建立稜鏡型網格而其他區域以四面體分割。改進賴與黃之建立法，本文有效地建立四面體與稜鏡型混合網格。利用上述方法，首先對正方形、三角形、矩形、梯形、六角形等五種幾何截面之微流道建立四面體與稜鏡型混合網格。然後採用流場程式求解這些微流道以計算管壁之摩擦係數並與相關文獻比較，以確定網格之品質與可用性。為進一步驗證本網格建立步驟在三維微管道之應用，對於具有不等截面積或不同截面外型之管道進行網格建立。最後，在微熱導管與微散熱器之流場區域建立網格以顯示本網格法可應用於複雜幾何外型。

　　The application of unstructured mesh in computational fluid dynamic becomes very important because of its availability of triangulating complicated geometry and its simplicity for use of adaptive mesh technique. The CAD software of CATIA is adopted in this thesis to provide geometry and triangular meshes on surfaces which we need. We use triangular meshes on surfaces to construct the unstructured tetrahedral meshes which are created by adopting a strategy for unstructured mesh generation developed by Liu and Hwang in the whole flow domain. Because the unstructured tetrahedral meshes are difficult to efficiently treat the boundary-layer problem, the prismatic meshes are created around the wing surface, and the other regions are divided into tetrahedrons. In this thesis to constructs the prismatic and tetrahedral hybrid meshes effectively by improving building of Lai and Hwang. Utilizing the proposed method in this thesis to constructs the prismatic and tetrahedral hybrid meshes of various geometry, such as square、triangular、rectangular、trapezoid、double-trapezoid five kinds of cross-section microchannels of geometry appearance. We use a program of flow field to solve thoes microchannels to calculate friction coefficients of microchannel walls, which sure the quality of meshes and availability. In order to prove the steps of constructed meshes which can be applied in three dimension microchannels, we construct meshes in differ cross-section area or cross-section geometry of microchannels. Finally, constructed meshes in the whole flow domain of micro heat pipe and micro heat spreaders to show methods of in this thesis can apply in complicated geometry appearance.

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