Microfluidic droplets are widely applied in various fields such as biomedicine, aerospace, energy utilization, and chemical engineering due to their advantages of large specific surface area, uniform size, stability, and easy control. The double T-shaped microchannel has the characteristics of rapid preparation of microdroplets with controllable size and good uniformity. Through 3D numerical simulation, the influence of the constriction structure of the microchannel on the formation of droplets was studied qualitatively and quantitatively. Compared with ordinary double T-shaped microchannels, the microchannels with a necked structure generate smaller droplets in diameter and faster generation frequency. Among the three structures of rectangular necking, inverted trapezoidal necking, and trapezoidal necking, the microchannel with the latter structure has the best performance, can produce monodisperse droplets of uniform size, and the period is stable.

中文翻译：

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在具有颈缩结构的双 T 形微通道中生成液滴

微流控液滴由于具有比表面积大、尺寸均匀、稳定性好、易于控制等优点，被广泛应用于生物医学、航空航天、能源利用、化工等各个领域。双T形微通道具有快速制备微滴尺寸可控、均匀性好的特点。通过3D数值模拟，定性和定量地研究了微通道的收缩结构对液滴形成的影响。与普通的双T形微通道相比，具有颈缩结构的微通道产生的液滴直径更小，产生频率更快。在矩形颈缩、倒梯形颈缩和梯形颈缩三种结构中，