Density profiles of a colloidal liquid at a wall under shear flow

Brader, Joseph; Krüger, Matthias

Density profiles of a colloidal liquid at a wall under shear flow

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Datum

2011

Autor:innen

Brader, Joseph

Krüger, Matthias

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Molecular Physics. 2011, 109(7-10), pp. 1029-1041. ISSN 0026-8976. Available under: doi: 10.1080/00268976.2010.541889

Zusammenfassung

Using a dynamical density functional theory we analyze the density profile of a colloidal liquid near a wall under shear flow. Due to the symmetries of the system considered, the naive application of dynamical density functional theory does not lead to a shear induced modification of the equilibrium density profile, which would be expected on physical grounds. By introducing a physically motivated dynamic mean field correction we incorporate the missing shear induced interparticle forces into the theory. We find that the shear flow tends to enhance the oscillations in the density profile of hardspheres at a hard-wall and, at sufficiently high shear rates, induces a nonequilibrium transition to a steady state characterized by planes of particles parallel to the wall. Under gravity, we find that the center-of-mass of the density distribution increases with shear rate, i.e., shear increases the potential energy of the particles.

Fachgebiet (DDC)

530 Physik

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ISO 690

BRADER, Joseph, Matthias KRÜGER, 2011. Density profiles of a colloidal liquid at a wall under shear flow. In: Molecular Physics. 2011, 109(7-10), pp. 1029-1041. ISSN 0026-8976. Available under: doi: 10.1080/00268976.2010.541889

BibTex

@article{Brader2011Densi-13778,
  year={2011},
  doi={10.1080/00268976.2010.541889},
  title={Density profiles of a colloidal liquid at a wall under shear flow},
  number={7-10},
  volume={109},
  issn={0026-8976},
  journal={Molecular Physics},
  pages={1029--1041},
  author={Brader, Joseph and Krüger, Matthias}
}

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    <dcterms:abstract xml:lang="eng">Using a dynamical density functional theory we analyze the density profile of a colloidal liquid near a wall under shear flow. Due to the symmetries of the system considered, the naive application of dynamical density functional theory does not lead to a shear induced modification of the equilibrium density profile, which would be expected on physical grounds. By introducing a physically motivated dynamic mean field correction we incorporate the missing shear induced interparticle forces into the theory. We find that the shear flow tends to enhance the oscillations in the density profile of hardspheres at a hard-wall and, at sufficiently high shear rates, induces a nonequilibrium transition to a steady state characterized by planes of particles parallel to the wall. Under gravity, we find that the center-of-mass of the density distribution increases with shear rate, i.e., shear increases the potential energy of the particles.</dcterms:abstract>
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