WÜRGER, Alois

doi:10.1017/jfm.2014.349

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WÜRGER, Alois
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Journal of Fluid Mechanics. 2014-07-10, vol. 752, p. 589

Cambridge University Press (CUP)

Résumé en anglais

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.< Réduire

Mots clés en anglais

Active soft matter

Janus particles

autopropulsion

Marangoni effect

thermocapillary

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Thermally driven Marangoni surfers

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