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Reduction of the effective shear viscosity in polymer solutions due to crossflow migration in microchannels: Effective viscosity models based on DPD simulations

Palmer, Teresa Lynne; Baardsen, Gustav; Skartlien, Roar
Journal article; SubmittedVersion
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preprint_palmer2017.pdf (1.339Mb)
Year
2017
Permanent link
http://urn.nb.no/URN:NBN:no-67180

CRIStin
1503853

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  • Kjemisk institutt [927]
  • CRIStin høstingsarkiv [16870]
Original version
Journal of Dispersion Science and Technology. 2017, 39 (2), 190-206, DOI: http://dx.doi.org/10.1080/01932691.2017.1306784
Abstract
Molecular dynamics simulations (dissipative particle dynamics–DPD) were developed and used to quantify wall-normal migration of polymer chains in microchannel Poseuille flow. Crossflow migration due to viscous interaction with the walls results in lowered polymer concentration near the channel walls. A larger fraction of the total flow volume becomes depleted of polymer when the channel width h decreases into the submicron range, significantly reducing the effective viscosity. The effective viscosity was quantified in terms of channel width and Weissenberg number Wi, for 5% polymer volume fraction in water. Algebraic models for the depletion width δ(Wi, h) and effective viscosity μe(δ/h, Wi) were developed, based on the hydrodynamic theory of Ma and Graham and our simulation results. The depletion width model can be applied to longer polymer chains after a retuning of the polymer persistence length and the corresponding potential/thermal energy ratio.
 
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