Abstract
With the aim of deepening the fundamental understanding of particle flow behaviors in inertial microfluidics, a mechanism of collision-triggered particle trapping in a confined rectangular microcavity (400 × 400 µm2) using microvortices is proposed, and an intriguing phenomenon that the orbit area of large particles is larger than that of small particles (diameter range of 22–38 µm) under the same flow conditions (Reynolds number = 178) is observed, which is in contrast to that indicated in previous reports. Moreover, the flow field structures of the microvortices are studied by micro-particle image velocimetry (micro-PIV), and the rotating behavior of a single particle (diameter = 40 µm) during orbiting is first measured experimentally. The results are expected to provide useful guidelines for the applications of microcavity-based microfluidics.
Published Version
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