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Issue 1, 2008
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Optical sectioning for microfluidics: secondary flow and mixing in a meandering microchannel

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Abstract

Secondary flow plays a critical function in a microchannel, such as a micromixer, because it can enhance heat and mass transfer. However, there is no experimental method to visualize the secondary flow and the associated mixing pattern in a microchannel because of difficulties in high-resolution, non-invasive, cross-sectional imaging. Here, we simultaneously imaged and quantified the secondary flow and pattern of two-liquid mixing inside a meandering square microchannel with spectral-domain Doppler optical coherence tomography. We observed an increase in the efficiency of two-liquid mixing when air was injected to produce a bubble-train flow and identified the three-dimensional enhancement mechanism behind the complex mixing phenomena. An alternating pair of counter-rotating and toroidal vortices cooperated to enhance two-liquid mixing.

Graphical abstract: Optical sectioning for microfluidics: secondary flow and mixing in a meandering microchannel

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Publication details

The article was received on 19 Feb 2007, accepted on 27 Sep 2007 and first published on 22 Oct 2007


Article type: Paper
DOI: 10.1039/B713626A
Citation: Lab Chip, 2008,8, 125-133
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    Optical sectioning for microfluidics: secondary flow and mixing in a meandering microchannel

    Y. Ahn, W. Jung and Z. Chen, Lab Chip, 2008, 8, 125
    DOI: 10.1039/B713626A

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