本文以晶格波茲曼法探討一開放圓型攪拌混合器於流體的濃度混合效率問題，入口角固定45度下，藉由兩個攪拌棒於濃度一階差分為零的攪拌槽內運轉之流場與濃度場，討論不同的葉片擺放位置在等角速度轉動和區間擺動下改變攪拌速度及振幅角度對混合效率的影響 。基於不可壓縮流之假設，本文以適當的設定轉速來確保流場的適用性。結果顯示同雷諾數下，葉片水平和垂直擺放之振幅分別大於 和 時，比等角速度轉動之混合效益還高，但是當擺動振幅趨近 時，因為攪拌棒擺動幅度過大，造成上下壁面未混合均勻的流體被推擠流出，故混合效率反而下降。上入口和出口斜置擺放葉片的攪拌槽則是以等角速度轉動即可得良好的混合效率。

This dissertation is to investigate the various scale of mixing efficiency, which are influenced by different placing impellers with oscillating and rotation. Using Lattice Boltzmann method to analyze the flow field and concentration field of stirred tank within the moving impellers. There are three types of position of the two impellers, one is horizontal, the second one is vertical, and the third is putting each impeller on upper entrance and exit tube.
The result reveals that the oscillating motion could lead to a better mixing performance. Besides, under the same constant angular velocity the position of the impellers which located at upper entrance and exit is the best.

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