The flow patterns and concentration distribution in a passive scaled-up micromixer is investigated experimentally over 5 ≤ Re ≤ 100. Four meandering elements serve to enlarge species interface area through the formation of Dean vortices, while 36 slanted grooved structures enhance secondary flow by promoting helical flow. The alternating direction of the curved channel segments and slanted grooves alternated the direction of secondary flow, increasing mixing. Flow visualization provides flow pattern information as seen from the top view, while induced fluorescence provides concentration distribution information at the outlet along the center plane. At low Re (Re = 5), species appear nearly horizontally stacked at the outlet, with a curved interface. As the Reynolds number increases, the angle the species interface makes with the horizontal direction increases due to the increased strength in rotational flow. At higher Re, the formation of Dean vortices is apparent.

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