Korea-Australia Rheology Journal

The Korean Society of Rheology (한국유변학회)
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Orientation and deformation of FENE dumbbells in confined microchannel and contraction flow geometry

  • Song, Sun-Jin (School of Chemical and Biological Engineering, Seoul National University) ;
  • Kim, Ju-Min (School of Chemical and Biological Engineering, Seoul National University) ;
  • Ahn, Kyung-Hyun (School of Chemical and Biological Engineering, Seoul National University) ;
  • Lee, Seung-Jong (School of Chemical and Biological Engineering, Seoul National University) ;
  • Yeo, Jong-Kee (LG Chemical Limited)
  • Published : 2007.11.30
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Abstract

The orientation and deformation of polymer chains in a confined channel flow has been investigated. The polymer chain was modeled as a Finitely Extensible Nonlinear Elastic (FENE) dumbbell. The Brownian configuration field method was extended to take the interaction between the flow and local chain dynamics into account. Drag and Brownian forces were treated as anisotropic in order to reflect the influence of the wall in the confined flow. Both Poiseuille flow and 4 : 1 contraction flow were considered. Of particular interest was molecular tumbling of polymer chains near the wall. It was strongly influenced by anisotropic drag and high shear close to the wall. We discussed the mechanism of this particular behavior in terms of the governing forces. The dumbbell configuration was determined not only by the wall interaction but also by the flow type of the geometric origin. The effect of extensional flow on dumbbell configuration was also discussed by comparing with the Poiseuille flow.

Keywords

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