近年來微全分析系統(μ-TAS)的發展日益精進，使得微機電技術(MEMS)可以快速發展，而微尺度下的管道時間裝置具有不易受汙染、實驗成本低、樣本需求數少與體積微小等優點，而因為可應用的範圍廣泛，故讓實驗結構越來越複雜，也需要越來越多的儀器來互相配合與應用。
因為以往之對於三維十字型微管道的流場分部與二維十字型微管道的液滴生成都是以光學顯微鏡來將實驗結果以平面的方法呈現，故本研究以利用以往之二維與三維十字型微管道進行結構的組合後，藉由商用軟體來將管道進行三維的數值模擬，使得整體流場可以以不同角度來進行觀察與探討，其中為了可以取得與實驗上的相似性與可信度，本研究將油與水之流速配置來產生液滴，並藉由改變流速配置來進行液滴生成趨勢上的探討，並將此結果與以往之研究結果做比較。而在確認整體流場與實驗之相似性後，本研究則繼續探討下游的三維十字型微管道內之流場，並探討其窗口與下游之油水分部與流場分部，並且嘗試分析其內部的油水分部之成因與主要控制整體流場的變因為何。

The development of micro total analysis system (μ-TAS) is getting well, and using micro-electromechanical system (MEMS) facilitates the micro channel experimental device and has some advantages like small size, less pollutions, few samples for experiment, low cost and so on. According to our experimental data of the combination of the cross-junction and T-junction structure, we can use this combination to generate double emulsions in our channel successfully, and the results of the experiment use the microscope to observe in two-dimension. By the commercial software Ansys Fluent to perform three-dimensional numerical simulation of the micro-channel, so that the entire flow field can be observed at different angles. In this study, in order to make similarity and credibility of the numerical results like experimental results, the flow rate of oil and water was used to generate droplets, and the trend of droplet formation was discussed by changing the flow rate configuration, and the results were compared with the previous results. After confirming the similarity of the whole flow field, we want to explore the flow field of the downstream in three-dimension microchannel, and try to analyze the internal flow field. Furthermore, we also want to know how we can control the entire flow field.

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