Geometric pumping in autophoretic channels

Sébastien Michelin 1 Thomas D. Montenegro-Johnson 2 Gabriele de Canio 2 Nicolas Lobato-Dauzier 1 Eric Lauga 2
1 LadHyX - Laboratoire d'hydrodynamique
2 DAMTP/CMS - Department of Applied Mathematics and Theoretical Physics / Centre for Mathematical Sciences
Abstract : Many microfluidic devices use macroscopic pressure differentials to overcome viscous friction and generate flows in microchannels. In this work, we investigate how the chemical and geometric properties of the channel walls can drive a net flow by exploiting the autophoretic slip flows induced along active walls by local concentration gradients of a solute species. We show that chemical patterning of the wall is not required to generate and control a net flux within the channel, rather channel geometry alone is sufficient. Using numerical simulations, we determine how geometric characteristics of the wall influence channel flow rate, and confirm our results analytically in the asymptotic limit of lubrication theory.
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Journal articles
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https://hal-polytechnique.archives-ouvertes.fr/hal-01187725
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Submitted on : Thursday, August 27, 2015 - 2:24:04 PM
Last modification on : Wednesday, March 27, 2019 - 4:39:25 PM

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Sébastien Michelin, Thomas D. Montenegro-Johnson, Gabriele de Canio, Nicolas Lobato-Dauzier, Eric Lauga. Geometric pumping in autophoretic channels. Soft Matter, Royal Society of Chemistry, 2015, 11 (29), pp.5804-5811. ⟨10.1039/c5sm00718f⟩. ⟨hal-01187725⟩

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