In this study, numerical simulations are conducted to investigate droplet breakup in an asymmetric T-junction microchannel with different cross-section ratios. To this approach, a two-phase model based on the volume of fluid (VOF) method is adopted to study the three-dimensional feature of droplet motion inside T-junctions. The comparison reveals that the present results are in good agreement with previous studies. The effects of the capillary number (Ca), the non-dimensional droplet length (L∗), and the non-dimensional width ratio (W∗) on the breakup time and splitting ratio of daughter droplets are studied. Five distinct regimes are observed involving the non-breakup, breakup with tunnel, breakup without tunnel, asymmetric breakup, and sorting. Achieved results indicate that the time of breakup (tbreakup∗) increases about 15% when the Ca is increased from 0.0134 to 0.0268 (about 100%). It is also found that the mass center of the mother droplet in the primary channel is shifted to a larger wide branch, which facilitates the asymmetric breakup of the droplet in a T-junction microchannel.

中文翻译：

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不同横截面比的非对称T型结微通道中液滴破碎的数值研究

在这项研究中，进行数值模拟以研究非对称中的液滴破裂吨-具有不同横截面比的连接微通道。针对这种方法，采用基于流体体积（VOF）方法的两相模型来研究液滴内部运动的三维特征吨-路口。比较表明，目前的结果与以前的研究非常吻合。毛细管数 (Ca)、无量纲液滴长度 (大号*) 和无量纲宽度比 (W*) 对子液滴的分裂时间和分裂比进行了研究。观察到五种不同的状态，包括非分裂、隧道分裂、无隧道分裂、不对称分裂和分选。取得的结果表明，分手的时间（吨分手*) 当 Ca 从 0.0134 增加到 0.0268（约 100%）时增加约 15%。还发现主通道中母液滴的质心向较大的宽分支移动，这有利于液滴在a中的不对称破碎吨-结微通道。