Issue 17, 2011
From the journal:

Lab on a Chip

Anomalous mixing behaviour in rotationally actuated microfluidic devices†

Debapriya Chakraborty,a   Marc Madoub  and  Suman Chakraborty*a  

* Corresponding authors

a Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, India
E-mail: suman@mech.iitkgp.ernet.in

b Department of Mechanical and Aerospace Engineering, University of California, Irvine, CA, USA

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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Article information

DOI
https://doi.org/10.1039/C1LC20453J
Article type
Communication
Submitted
25 May 2011
Accepted
04 Jul 2011
First published
20 Jul 2011

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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