Zigzag microchannels are commonly used in microreactor and μTAS, because they are the simplest structures that can function both as a path for liquid transportation and a fluid mixing device. In ordinary zigzag channels, the bending direction alternates, and as a result, the convective fluid mixing effect at one bend is partially cancelled at the next bend. Therefore, the zigzag channel with
m alternating bends does not exhibit
m times as much mixing performance as a channel with a single bend even. In this study, the mixing performance of four special types of zigzag channels was compared. These channels had
m successive 90° bends in the same direction, then
m successive 90° bends in the opposite direction, and this pattern was repeated numerous times. Experiments with channels having
m=1, 2, 3, or 4 were performed to determine mixing efficiency and the flow condition as
Re number.
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