Korea-Australia Rheology Journal

The Korean Society of Rheology (한국유변학회)
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Concentration distributions during flow of confined flowing polymer solutions at finite concentration: slit and grooved channel

  • Hernandez-Ortiz, Juan P. (Department of Chemical and Biological Engineering, University of Wisconsin-Madison) ;
  • Ma, Hong-Bo (Department of Chemical and Biological Engineering, University of Wisconsin-Madison) ;
  • de Pablo, Juan J. (Department of Chemical and Biological Engineering, University of Wisconsin-Madison) ;
  • Graham, Michael D. (Department of Chemical and Biological Engineering, University of Wisconsin-Madison)
  • Published : 2008.09.30
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Abstract

Simulations of solutions of flexible polymer molecules during flow in simple or complex confined geometries are performed. Concentrations from ultradilute up to near the overlap concentration are considered. As concentration increases, the hydrodynamic migration effects observed in dilute solution unidirectional flows (Couette flow, Poiseuille flow) become less prominent, virtually vanishing as the overlap concentration is approached. In a grooved channel geometry, the groove is almost completely depleted of polymer chains at high Weissenberg number in the dilute limit, but at finite concentration this depletion effect is dramatically reduced. Only upon inclusion of hydrodynamic interactions can these phenomena be properly captured.

Keywords

References

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