Pressure-driven laminar flow in tangential microchannels: An elastomeric microfluidic switch

R. F. Ismagilov, D. Rosmarin, P. J.A. Kenis, D. T. Chiu, W. Zhang, H. A. Stone, G. M. Whitesides

Research output: Contribution to journalArticle

90 Scopus citations

Abstract

This paper describes laminar fluid flow through a three-dimensional elastomeric microstructure formed by two microfluidic channels, fabricated in layers that contact one another face-to-face (typically at a 90° angle), with the fluid flows in tangential contact. There are two ways to control fluid flow through these tangentially connected microchannels. First, the flow profiles through the crossings are sensitive to the aspect ratio of the channels; the flow can be controlled by applying external pressure and changing this aspect ratio. Second, the flow direction of an individual laminar stream in multiphase laminar flow depends on the lateral position of the stream within the channel; this position can be controlled by injecting additional streams of fluid into the channel. We describe two microfluidic switches based on these two ways for controlling fluid flow through tangential microchannels and present theoretical arguments that explain the observed dependence of the flow profiles on the aspect ratio of the channels.

Original languageEnglish (US)
Pages (from-to)4682-4687
Number of pages6
JournalAnalytical Chemistry
Volume73
Issue number19
DOIs
StatePublished - Oct 1 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

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  • Cite this

    Ismagilov, R. F., Rosmarin, D., Kenis, P. J. A., Chiu, D. T., Zhang, W., Stone, H. A., & Whitesides, G. M. (2001). Pressure-driven laminar flow in tangential microchannels: An elastomeric microfluidic switch. Analytical Chemistry, 73(19), 4682-4687. https://doi.org/10.1021/ac010374q