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Issue 17, 2011
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Anomalous mixing behaviour in rotationally actuated microfluidic devices

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Abstract

We analyse the characteristics of two-fluid mixing in T-shaped microchannels on rotating platforms (Lab-on-a-Compact-Disk framework). Three regimes of mixing were identified based on the distinct flow behaviour in each of these regimes. A diffusion-based mixing regime was obtained for low rotation speeds. A Coriolis force based mixing regime was observed for intermediate rotation speeds, which introduced some nontrivial aspects in the mixing behaviour, which was explained through scaling analysis. At very high rotational speeds, rapid mixing close to the junction was achieved by exploiting flow instabilities (instability based mixing). A good agreement between the theoretical calculations and the experimental observations was obtained.

Graphical abstract: Anomalous mixing behaviour in rotationally actuated microfluidic devices

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Publication details

The article was received on 25 May 2011, accepted on 04 Jul 2011 and first published on 20 Jul 2011


Article type: Communication
DOI: 10.1039/C1LC20453J
Citation: Lab Chip, 2011,11, 2823-2826
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    Anomalous mixing behaviour in rotationally actuated microfluidic devices

    D. Chakraborty, M. Madou and S. Chakraborty, Lab Chip, 2011, 11, 2823
    DOI: 10.1039/C1LC20453J

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