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

Dong Hyun Yoon, Jin Bong Ha, Yoen Kyung Bahk, Takahiro Arakawa, Shuichi Shoji, Jeung Sang Go

Research output: Contribution to journalArticle

58 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)87-90
Number of pages4
JournalLab on a Chip
Issue number1
Publication statusPublished - 2009 Jan 1


ASJC Scopus subject areas

  • Bioengineering
  • Biochemistry
  • Chemistry(all)
  • Biomedical Engineering

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