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標題: T 型流道中微流體乳化現象數值模擬與分析
Numerical study of microfluidic emulsion in T-junction
作者: 劉忠敏
Liu, Chung-Min
關鍵字: two-phase flow;兩相流;emulsion droplet;T-junction;乳化微液滴;T 型流道
出版社: 機械工程學系所
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本研究利用三維有限體積數值方法配合 Volume of fluid 模型模擬兩相流體於 T 型流道中生成乳化液滴的現象。乳化過程乃消散相流體分散於另一不相溶之連續相流體中。本模擬以油為連續相流體,水為消散相流體。我們觀察乳化液滴體積與生成頻率隨著連續相與消散相流速及流道尺寸變化的關係。這些參數範圍分別為,連續相流速 Uc = 0.033 – 0.161 m/s、消散相流速 Ud = 0.002 – 0.041 m/s,而流道截面尺寸為 50 um×50 um 與 100 um×100 um。在此流速範圍內,兩種流道生成的液滴直徑與流道水力直徑之比值相當接近,為 0.5 – 1.2 倍之間;在較小流道中最大生成頻率高達 3790 s-1,而在較大流道中最大生成頻率則為 2225 s-1。本研究發展出精確計算乳化液滴體積的量測方法,並發現液滴直徑和生成頻率皆與 Uc(Uc/Ud)0.5 呈指數關係。

This paper reports numerical results of droplet generation through a microchannel having a T-shape junction with uniform cross sections of 50 um×50 um and 100 um×100 um. Oil (Continuous phase) and water (Dispersed phase) are injected into the T-junction inlets to form water-in-oil emulsions for velocities ranging from Uc = 0.033 - 0.161 m/s and Ud = 0.002 - 0.041 m/s, respectively. The volume of fluid scheme was employed in the simulations to identify the oil-water interface. In the preset velocity ranges, the ratio of droplet diameter to channel hydraulic diameter appears to be nearly 0.8±0.3. Further comparisons show that the droplet diameter and production rate may correlated with the velocity ratio Uc(Uc/Ud)0.5 as a power law. It is found that the droplet generation frequency can reach as much as 3790 s-1 for the narrower channel while the frequency for the wider channel is at 2225 s-1.
其他識別: U0005-1607200915132700
Appears in Collections:機械工程學系所

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