Geometric pumping in autophoretic channels - Archive ouverte HAL Access content directly
Journal Articles Soft Matter Year : 2015

Geometric pumping in autophoretic channels

(1) , (2) , (2) , (1) , (2)
1
2

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.

Dates and versions

hal-01187725 , version 1 (27-08-2015)

Identifiers

Cite

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

Altmetric

Share

Gmail Facebook Twitter LinkedIn More