New regime of droplet generation in a T-shape microfluidic junction
New regime of droplet generation in a T-shape microfluidic junction
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DOI：
10.1007/s10404-012-1021-8
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发表时间：
2013
影响因子：
2.8
通讯作者：
Nathalie Tarchichi;F. Chollet;J. Manceau
中科院分区：
文献类型：
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作者：
Nathalie Tarchichi;F. Chollet;J. Manceau
我们提出了一个新的单分散微滴产生的制度，我们命名为气球制度的实验研究。研究了T型连接微流控系统中油在水中的分散。测试了具有连续相微通道和分散相微通道的不同横截面的几种微流体装置。这种新的区域只出现在低分散相速度下.微液滴的尺寸主要与T型连接微通道的几何形状，特别是其宽度和深度有关，而与连续相和分散相的速度无关。在我们的实验中，连续相和分散相的速度分别在很宽的范围内变化：从0.5到500 mm/s，从0.01到30 mm/s。我们发现，连续相只控制微滴的密度，而分散相线性地改变微滴产生的频率。本方案的另一个特点是，微滴在T形接头处的整个形成过程中保持其圆形形状，并且不会由于拖曳力而发生变形，这是本方案与所有其他已知方案的区别。我们提出了一种机制来解释在这个新的制度的微滴的形成。
We present an experimental study of a new regime of monodisperse micro-droplet generation that we named the balloon regime. A dispersion of oil in water in a T-junction microfluidic system was studied. Several microfluidic devices having different cross-sections of the continuous and the dispersed phases micro-channels were tested. This new regime appears only for low- dispersed phase velocity. The micro-droplet size is mainly related to the geometry of the T-junction micro-channels especially its width and depth, and independent of the continuous and dispersed phases velocities. In our experiments, the velocities of the continuous and the dispersed phasesandrespectively, have been varied in a wide range:from 0.5 to 500 mm/s, andfrom 0.01 to 30 mm/s. We show that the continuous phase only controls the micro-droplet density, while the dispersed phase linearly changes the frequency of the micro-droplet generation. Another particularity of the present regime, which differentiates it from all other known regimes, is that the micro-droplet retains its circular shape throughout its formation at the T junction, and undergoes no deformation due to the drag forces. We propose a mechanism to explain the formation of micro-droplets in this new regime.