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Rheological study of polymer flow past rough surfaces with slip boundary conditions

J. Chem. Phys. 129, 144902 (2008); doi:10.1063/1.2988496

Published 8 October 2008

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Anoosheh Niavarani and Nikolai V. Priezjev
Department of Mechanical Engineering, Michigan State University, East Lansing, Michigan 48824, USA
The slip phenomena in thin polymer films confined by either flat or periodically corrugated surfaces are investigated by molecular dynamics and continuum simulations. For atomically flat surfaces and weak wall-fluid interactions, the shear rate dependence of the slip length has a distinct local minimum which is followed by a rapid increase at higher shear rates. For corrugated surfaces with wavelength larger than the radius of gyration of polymer chains, the effective slip length decays monotonically with increasing corrugation amplitude. At small amplitudes, this decay is reproduced accurately by the numerical solution of the Stokes equation with constant and rate-dependent local slip length. When the corrugation wavelength is comparable to the radius of gyration, the continuum predictions overestimate the effective slip length obtained from molecular dynamics simulations. The analysis of the conformational properties indicates that polymer chains tend to stretch in the direction of shear flow above the crests of the wavy surface. ©2008 American Institute of Physics
History: Received 24 January 2008; accepted 2 September 2008; published 8 October 2008
Permalink: http://link.aip.org/link/?JCPSA6/129/144902/1
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KEYWORDS and PACS

Keywords
PACS
  • 47.57.Qk
    Rheological aspects of fluid dynamics of complex fluids
  • 47.57.Ng
    Fluid dynamics of polymers and polymer solutions
  • 47.45.Gx
    Slip flows and accomodation in fluid dynamics
  • 47.11.Mn
    Molecular dynamics methods in fluid dynamics
  • 47.27.N-
    Wall-bounded shear flow turbulence
  • YEAR: 2008

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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