Two-phase flow patterns and size distribution of droplets in a microfluidic T-junction: Experimental observations in the squeezing regime
Two-phase flow patterns and size distribution of droplets in a microfluidic T-junction: Experimental observations in the squeezing regime
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DOI：
10.1016/j.crme.2017.02.001
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发表时间：
2017-04
影响因子：
0.8
通讯作者：
Y. Mahdi;K. Daoud;L. Tadrist
中科院分区：
文献类型：
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作者：
Y. Mahdi;K. Daoud;L. Tadrist
在内径为250μm的T形结微流控系统中，用聚四氟乙烯毛细管研究了微米级液滴的产生。通过改变分散相流速从2.78⋅10−11m 3/S到5.2 8⋅10−9m 3/S和连续相流速从2.78⋅10−10 m 3/S到1.94⋅10−9 m 3/S进行了多次实验，对低毛细管数的三种流型(液滴、塞状和环状)进行了可视化。液滴在分散相中的尺寸分布采用高斯模型，流动品质x在0.016~0.44之间变化。分散相中液滴尺寸分布随流动质量的变化规律表明，液滴直径的变化系数与流动质量成反比。
Generating micrometer sized droplets has been studied in a microfluidic system with T-junction geometry 250 μm in internal diameter and with PTFE capillary tubing. Several experiments were conducted by varying the flow rate of the dispersed phase from 2.78⋅ 10− 11 m 3/s to 5.28⋅ 10− 9 m 3/s and that of the continuous phase from 2.78⋅ 10− 10 m 3/s to 1.94⋅ 10− 9 m 3/s. The visualization of different flow regimes (drop, plug, and annular) was carried out for three configurations (not inverted in a horizontal position, inverted in a horizontal position, and inverted in a vertical position) for low capillary numbers. The model of Gauss was also chosen for a droplet size distribution in the dispersed phase, with the flow quality x varying from 0.016 to 0.44. The evolution of the drop size distribution as a function of the flow quality in the dispersed phase shows that the variation coefficient of the droplet's diameter is inversely proportional to the flow quality.