Pressure-driven microdroplet formation was experimentally investigated in glass flow-focusing devices using micro-imaging. The observations illustrated the effects of some important factors affecting the droplet formation, including the channel geometry, two-phase flow rates and non-Newtonian behavior of the continuous phase. Although the droplet formation dynamics showed some different characteristics in different geometries, self-similarities of the dispersed thread were found in both devices for various initial conditions by normalizing the thread length and time. When power-law shear-thinning fluids were used as the continuous phase, the growth of the dispersed thread was still self-similar, but the relationship became linear rather than power-law as with the Newtonian continuous phase. The droplet shape also changed for droplet generated in shear-thinning fluids, so a deformation index (D.I.) was defined to describe the shape differences. Finally, a previously presented prediction model was validated by the experimental data with good agreement.

在玻璃流动聚焦装置中使用微成像对压力驱动的微滴形成进行了实验研究。观测结果说明了影响液滴形成的一些重要因素的影响，包括通道几何形状，两相流速和连续相的非牛顿行为。尽管液滴的形成动力学在不同的几何形状中显示出一些不同的特性，但是通过标准化线的长度和时间，在两种设备中对于各种初始条件都发现了分散线的自相似性。当使用幂律剪切稀化流体作为连续相时，分散线的生长仍然是自相似的，但是这种关系变成线性的，而不是像牛顿连续相那样是幂律。定义DI。）以描述形状差异。最后，通过实验数据验证了先前提出的预测模型，具有很好的一致性。