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Flow-Induced Birefringence of Polymers in the Region of Abrupt Thickness Transition

두께가 급격히 변하는 영역에서 고분자 유동에 의한 복굴절

  • 이호상 (충주대학교 항공.기계설계학과) ;
  • Published : 2009.02.01

Abstract

A finite element analysis was carried out for a 4:1 planar contraction die for polymer melts using the viscoelastic constitutive equation of Leonov. Viscoelastic fluids showed significant differences in pressure drop and birefringence in contraction and expansion flows. The pressure drop was higher and the birefringence smaller in expansion than in contraction flow. The difference increased with increasing flow rate. The nonlinear Leonov model was shown to describe the viscoelastic effects observed in experiments.

Keywords

References

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