Diffusiophoresis at the macroscale - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review Fluids Année : 2016

Diffusiophoresis at the macroscale

Résumé

Diffusiophoresis, a ubiquitous phenomenon that induces particle transport whenever solute concentration gradients are present, was recently observed in the context of microsystems and shown to strongly impact colloidal transport (patterning and mixing) at such scales. In the present work, we show experimentally that this nanoscale mechanism can induce changes in the macroscale mixing of colloids by chaotic advection. Rather than the decay of the standard deviation of concentration, which is a global parameter commonly employed in studies of mixing, we instead use multiscale tools adapted from studies of chaotic flows or intermittent turbulent mixing: concentration spectra and second and fourth moments of the probability density functions of scalar gradients. Not only can these tools be used in open flows, but they also allow for scale-by-scale analysis. Strikingly, diffusiophoresis is shown to affect all scales, although more particularly the small ones, resulting in a change of scalar intermittency and in an unusual scale bridging spanning more than seven orders of magnitude. By quantifying the averaged impact of diffusiophoresis on the macroscale mixing, we explain why the effects observed are consistent with the introduction of an effective Péclet number.
Fichier principal
Vignette du fichier
Mauger_etal_PhysRevFluids_2016.pdf (935.23 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-01242358 , version 1 (15-12-2015)
hal-01242358 , version 2 (28-05-2016)
hal-01242358 , version 3 (06-07-2016)
hal-01242358 , version 4 (12-07-2017)

Identifiants

Citer

Cyril Mauger, Romain Volk, Nathanaël Machicoane, Mickaël Bourgoin, Cécile Cottin-Bizonne, et al.. Diffusiophoresis at the macroscale. Physical Review Fluids, 2016, Physical Review Fluids, 1 (3), pp.034001. ⟨10.1103/PhysRevFluids.1.034001⟩. ⟨hal-01242358v4⟩
291 Consultations
368 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More