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Issue 1, 2009
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Size-selective separation of micro beads by utilizing secondary flow in a curved rectangular microchannel

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Abstract

This paper presents a microscale benefit of a secondary flow obtained in a curved rectangular microchannel, which is generally unfavorable and negligible in conventional fluid flow. We have demonstrated the separation and sorting of micro beads by their size using secondary flow. The physical mechanism occurring in the size-selective separation was explained based on the numerical analysis of the characteristic velocity distribution on the cross-sectional plane normal to the main flow stream. The dynamic trajectories of micro beads of different sizes and materials are visualized and compared for the experimental demonstration. We also discuss the effects of both the shape uniformity of the micro beads and the inlet condition on the size-selective separation.

Graphical abstract: Size-selective separation of micro beads by utilizing secondary flow in a curved rectangular microchannel

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Publication details

The article was received on 29 May 2008, accepted on 22 Sep 2008 and first published on 21 Oct 2008


Article type: Paper
DOI: 10.1039/B809123D
Lab Chip, 2009,9, 87-90

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    Size-selective separation of micro beads by utilizing secondary flow in a curved rectangular microchannel

    D. H. Yoon, J. B. Ha, Y. K. Bahk, T. Arakawa, S. Shoji and J. S. Go, Lab Chip, 2009, 9, 87
    DOI: 10.1039/B809123D

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