Enhanced particle self-ordering in a double-layer channel

  • Sheng YanEmail author
  • Yuxing Li
  • Qianbin Zhao
  • Dan Yuan
  • Guolin Yun
  • Shi-Yang Tang
  • Weihua LiEmail author


In this work, a novel double-layer microfluidic device for enhancing particle focusing was presented. The double-layer device consists of a channel with expansion-contraction array and periodical slanted grooves. The secondary flows induced by the grooves modulate the flow patterns in the expansion-contraction-array (ECA) channel, further affecting the particle migration. Compared with the single ECA channel, the double-layer channel can focus the particles over a wider range of flow rate. Due to the differentiation of lateral migration, the double-layer channel is able to distinguish the particles with different sizes. Furthermore, the equilibrium positions could be modulated by the orientation of grooves. This work demonstrates the possibility to enhance and adjust the inertial focusing in an ECA channel with the assistance of grooves, which may provide a simple and portable platform for downstream filtration, separation, and detection.


Double-layer channel Self-ordering Inertial microfluidics Fluid dynamics 



Dr. Sheng Yan is the recipient of the 2018 Endeavour Research Fellowship funded by the Australian Department of Education and Training. Dr. Shi-Yang Tang is the recipient of the Vice-Chancellor’s Postdoctoral Research Fellowship funded by the University of Wollongong.

Compliance with ethical standards

Conflict of interest

There are no conflicts of interest to declare.


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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Mechanical, Materials, Mechatronic and Biomedical EngineeringUniversity of WollongongWollongongAustralia

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