Abstract The co-current oil-water flow in a horizontal serpentine channel is studied experimentally by high-speed imaging. Due to the channel geometry, the flow exhibits curved streamlines, which can induce secondary flows and alter the flow pattern transition boundaries in comparison with those observed in straight channels. This can have important applications in the development of microfluidic mixing devices. The serpentine channel was cut out in a black polypropylene sheet sandwiched between two transparent polypropylene sheets and bonded by selective laser welding. Different flow patterns were generated by changing independently the superficial velocities of the two fluids using a dual-drive syringe pump. Results enable the construction of a flow pattern map, which shows significant differences with the equivalent map obtained for straight microchannels.

中文翻译：

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蛇形通道油水流动的实验研究

摘要 通过高速成像实验研究了水平蛇形通道中的并流油水流动。由于通道的几何形状，流动表现出弯曲的流线，与在直通道中观察到的相比，这可以引起二次流动并改变流型过渡边界。这在微流体混合装置的开发中具有重要的应用。蛇形通道是在夹在两个透明聚丙烯板之间的黑色聚丙烯板中切割出来的，并通过选择性激光焊接进行粘合。通过使用双驱动注射泵独立改变两种流体的表面速度，产生不同的流动模式。结果能够构建流型图，