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Thermally driven Marangoni surfers
Language
en
Article de revue
This item was published in
Journal of Fluid Mechanics. 2014-07-10, vol. 752, p. 589
Cambridge University Press (CUP)
English Abstract
We study autopropulsion of an interface particle that is driven by the Marangoni stress arising from a self-generated asymmetric temperature or concentration field. We calculate separately the long-range Marangoni flow vI ...Read more >
We study autopropulsion of an interface particle that is driven by the Marangoni stress arising from a self-generated asymmetric temperature or concentration field. We calculate separately the long-range Marangoni flow vI due to the stress discontinuity at the interface and the short-range velocity field vP imposed by the no-slip condition on the particle surface. Both contributions are evaluated for a spherical floater with temperature monopole and dipole moments. We find that the self-propulsion velocity is given by the amplitude of the 'source doublet' that belongs to the short-range contribution vP. Hydrodynamic interactions, on the other hand, are determined by the long-range Marangoni flow vI . Its dipolar part results in an asymmetric advection pattern of neighbouring particles, which in turn may perturb the known hexatic lattice or even favour disordered states.Read less <
English Keywords
Active soft matter
Janus particles
autopropulsion
Marangoni effect
thermocapillary
Origin
Hal imported
