Achievement of efficient mixing in microfluidic systems appears to be a highly challenging proposition, as attributable to typical low Reynolds number hydrodynamics over small scales. To circumvent these constraints, numerous strategies, either relying upon a modulation in the microchannel geometry or involving active flow perturbations have been proposed in the literature. However, while the geometric or passive means suffer from a lack of dynamic control on the mixing process, the active methods can be unfavorably energy expensive. Here we show that the problem of controllability and energy efficiency can be optimized to a large extent by combining the active and passive strategies within an integrated microfluidic platform, in the form of serpentine microchannel geometry with embedded electrodes. We demonstrate, both theoretically and experimentally, that in specific operating regimes, the mixing effectiveness (expressed in terms of a quantifiable index) of the designed system can be nontrivially higher than the algebraic sum of effectivenesses realized from pure active and passive mixing configurations, leading to a nonlinear amplification in the separation efficiency. Results of our experiments may be used a generic design principle for optimized mixing performance of lab-on-a-chip microdevices, with a judicious combination of the active and passive mixing paradigms.
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1 March 2012
Research Article|
March 02 2012
Nontrivial augmentations in mixing performance through integrated active and passive mixing in serpentine microchannels
Sujay K. Biswas;
Sujay K. Biswas
1Department of Mechanical Engineering,
Indian Institute of Technology
, Kharagpur – 721302, India
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Tamal Das;
Tamal Das
2Department of Biotechnology,
Indian Institute of Technology
, Kharagpur – 721302, India
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Suman Chakraborty
Suman Chakraborty
a)
1Department of Mechanical Engineering,
Indian Institute of Technology
, Kharagpur – 721302, India
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected].
J. Appl. Phys. 111, 054904 (2012)
Article history
Received:
November 24 2010
Accepted:
February 01 2012
Citation
Sujay K. Biswas, Tamal Das, Suman Chakraborty; Nontrivial augmentations in mixing performance through integrated active and passive mixing in serpentine microchannels. J. Appl. Phys. 1 March 2012; 111 (5): 054904. https://doi.org/10.1063/1.3689808
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