Imperial College London
Alternate

ProfessorDemetriosPapageorgiou

Faculty of Natural Sciences, Department of Mathematics

Chair in Applied Maths and Mathematical Physics
 
 
 
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Contact

 

+44 (0)20 7594 8369d.papageorgiou Website

 
 
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Location

 

750Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Michelin:2020:10.1039/c9sm02173f,
author = {Michelin, S and Game, S and Lauga, E and Keaveny, E and Papageorgiou, D},
doi = {10.1039/c9sm02173f},
journal = {Soft Matter},
pages = {1259--1269},
title = {Spontaneous onset of convection in a uniform phoretic channel.},
url = {http://dx.doi.org/10.1039/c9sm02173f},
volume = {16},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Phoretic mechanisms, whereby gradients of chemical solutes induce surface-driven flows, have recently been used to generate directed propulsion of patterned colloidal particles. When the chemical solutes diffuse slowly, an instability further provides active isotropic particles with a route to self-propulsion by spontaneously breaking the symmetry of the solute distribution. Here we show theoretically that, in a mechanism analogous to Bénard-Marangoni convection, phoretic phenomena can create spontaneous and self-sustained wall-driven mixing flows within a straight, chemically-uniform active channel. Such spontaneous flows do not result in any net pumping for a uniform channel but greatly modify the distribution and transport of the chemical solute. The instability is predicted to occur for a solute Péclet number above a critical value and for a band of finite perturbation wavenumbers. We solve the perturbation problem analytically to characterize the instability, and use both steady and unsteady numerical computations of the full nonlinear transport problem to capture the long-time coupled dynamics of the solute and flow within the channel.
AU  - Michelin,S
AU  - Game,S
AU  - Lauga,E
AU  - Keaveny,E
AU  - Papageorgiou,D
DO  - 10.1039/c9sm02173f
EP  - 1269
PY  - 2020///
SN  - 1744-683X
SP  - 1259
TI  - Spontaneous onset of convection in a uniform phoretic channel.
T2  - Soft Matter
UR  - http://dx.doi.org/10.1039/c9sm02173f
UR  - https://www.ncbi.nlm.nih.gov/pubmed/31913392
UR  - https://pubs.rsc.org/en/content/articlelanding/2020/SM/C9SM02173F#!divAbstract
UR  - http://hdl.handle.net/10044/1/77056
VL  - 16
ER  -
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