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Particle motion nearby rough surfaces
KTH, School of Engineering Sciences (SCI), Engineering Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-3443-0709
2020 (English)In: Physical Review Fluids, E-ISSN 2469-990X, Vol. 5, no 8, article id 082101Article in journal (Refereed) Published
Abstract [en]

We study the hydrodynamic coupling between particles and solid, rough boundaries characterized by random surface textures. Using the Lorentz reciprocal theorem, we derive analytical expressions for the grand mobility tensor of a spherical particle and find that roughness-induced velocities vary nonmonotonically with the characteristic wavelength of the surface. In contrast to sedimentation near a planar wall, our theory predicts continuous particle translation transverse and perpendicular to the applied force. Most prominently, this motion manifests itself in a variance of particle displacements that grows quadratically in time along the direction of the force. This increase is rationalized by surface roughness generating particle sedimentation closer to or farther from the surface, which entails a significant variability of settling velocities.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2020. Vol. 5, no 8, article id 082101
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-280205DOI: 10.1103/PhysRevFluids.5.082101ISI: 000559927800001Scopus ID: 2-s2.0-85092048942OAI: oai:DiVA.org:kth-280205DiVA, id: diva2:1502015
Note

QC 20201118

Available from: 2020-11-18 Created: 2020-11-18 Last updated: 2022-06-25Bibliographically approved

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Zhu, Lailai

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