Numerical study on extrudate swell of polymer melts in extrusion from various dies

Toshihisa Kajiwara, Yoshifumi Kuwano, Masahiko Sameshima, Kazumori Funatsu

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

This paper describes a numerical study on the extrudate swell of polymer melts in extrusion from various kinds of dies in shape, namely parallel plate, capillary, annular and converging dies. The Oldroyd-B, the Giesekus type and the Phan Thien-Tanner type models were used as the constitutive equations of polymer melts. Swelling ratio, shape of the free surface, and distributions of velocity, stress and pressure were calculated by the ordinary Galerkin's finite element method and the streamline-upwind finite element method. The calculated results for three kinds of viscoelastic models and the Newtonian fluid showed that the swelling phenomenon is closely related to the magnitude of the primary normal stress difference and the shear-thinning effect of shear viscosity. It was also found that the swelling mechanism can be understood mainly from the viewpoint of stress. From the results for annular dies, the difference of shape of free surface between annular extrudate and parallel plate or capillary extrudate was clarified. Furthermore the entrance effect on extrudate swell was found in the low deformation rate from the results for converging dies.

Original languageEnglish
Pages (from-to)145-162
Number of pages18
JournalMemoirs of the Kyushu University, Faculty of Engineering
Volume51
Issue number3
Publication statusPublished - Sep 1 1991

Fingerprint

Polymer melts
swell
extrusion
swelling
Extrusion
polymer
melt
Swelling
finite element method
Newtonian fluid
constitutive equation
Finite element method
thinning
Shear viscosity
Shear thinning
viscosity
Constitutive equations
Fluids
Polymers
effect

All Science Journal Classification (ASJC) codes

  • Energy(all)
  • Atmospheric Science
  • Earth and Planetary Sciences(all)
  • Management of Technology and Innovation

Cite this

Numerical study on extrudate swell of polymer melts in extrusion from various dies. / Kajiwara, Toshihisa; Kuwano, Yoshifumi; Sameshima, Masahiko; Funatsu, Kazumori.

In: Memoirs of the Kyushu University, Faculty of Engineering, Vol. 51, No. 3, 01.09.1991, p. 145-162.

Research output: Contribution to journalArticle

Kajiwara, Toshihisa ; Kuwano, Yoshifumi ; Sameshima, Masahiko ; Funatsu, Kazumori. / Numerical study on extrudate swell of polymer melts in extrusion from various dies. In: Memoirs of the Kyushu University, Faculty of Engineering. 1991 ; Vol. 51, No. 3. pp. 145-162.
@article{fde35fdc496443c7bef60b2009bc6d9c,
title = "Numerical study on extrudate swell of polymer melts in extrusion from various dies",
abstract = "This paper describes a numerical study on the extrudate swell of polymer melts in extrusion from various kinds of dies in shape, namely parallel plate, capillary, annular and converging dies. The Oldroyd-B, the Giesekus type and the Phan Thien-Tanner type models were used as the constitutive equations of polymer melts. Swelling ratio, shape of the free surface, and distributions of velocity, stress and pressure were calculated by the ordinary Galerkin's finite element method and the streamline-upwind finite element method. The calculated results for three kinds of viscoelastic models and the Newtonian fluid showed that the swelling phenomenon is closely related to the magnitude of the primary normal stress difference and the shear-thinning effect of shear viscosity. It was also found that the swelling mechanism can be understood mainly from the viewpoint of stress. From the results for annular dies, the difference of shape of free surface between annular extrudate and parallel plate or capillary extrudate was clarified. Furthermore the entrance effect on extrudate swell was found in the low deformation rate from the results for converging dies.",
author = "Toshihisa Kajiwara and Yoshifumi Kuwano and Masahiko Sameshima and Kazumori Funatsu",
year = "1991",
month = "9",
day = "1",
language = "English",
volume = "51",
pages = "145--162",
journal = "Memoirs of the Faculty of Engineering, Kyushu University",
issn = "1345-868X",
publisher = "Kyushu University, Faculty of Science",
number = "3",

}

TY - JOUR

T1 - Numerical study on extrudate swell of polymer melts in extrusion from various dies

AU - Kajiwara, Toshihisa

AU - Kuwano, Yoshifumi

AU - Sameshima, Masahiko

AU - Funatsu, Kazumori

PY - 1991/9/1

Y1 - 1991/9/1

N2 - This paper describes a numerical study on the extrudate swell of polymer melts in extrusion from various kinds of dies in shape, namely parallel plate, capillary, annular and converging dies. The Oldroyd-B, the Giesekus type and the Phan Thien-Tanner type models were used as the constitutive equations of polymer melts. Swelling ratio, shape of the free surface, and distributions of velocity, stress and pressure were calculated by the ordinary Galerkin's finite element method and the streamline-upwind finite element method. The calculated results for three kinds of viscoelastic models and the Newtonian fluid showed that the swelling phenomenon is closely related to the magnitude of the primary normal stress difference and the shear-thinning effect of shear viscosity. It was also found that the swelling mechanism can be understood mainly from the viewpoint of stress. From the results for annular dies, the difference of shape of free surface between annular extrudate and parallel plate or capillary extrudate was clarified. Furthermore the entrance effect on extrudate swell was found in the low deformation rate from the results for converging dies.

AB - This paper describes a numerical study on the extrudate swell of polymer melts in extrusion from various kinds of dies in shape, namely parallel plate, capillary, annular and converging dies. The Oldroyd-B, the Giesekus type and the Phan Thien-Tanner type models were used as the constitutive equations of polymer melts. Swelling ratio, shape of the free surface, and distributions of velocity, stress and pressure were calculated by the ordinary Galerkin's finite element method and the streamline-upwind finite element method. The calculated results for three kinds of viscoelastic models and the Newtonian fluid showed that the swelling phenomenon is closely related to the magnitude of the primary normal stress difference and the shear-thinning effect of shear viscosity. It was also found that the swelling mechanism can be understood mainly from the viewpoint of stress. From the results for annular dies, the difference of shape of free surface between annular extrudate and parallel plate or capillary extrudate was clarified. Furthermore the entrance effect on extrudate swell was found in the low deformation rate from the results for converging dies.

UR - http://www.scopus.com/inward/record.url?scp=0026225414&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0026225414&partnerID=8YFLogxK

M3 - Article

VL - 51

SP - 145

EP - 162

JO - Memoirs of the Faculty of Engineering, Kyushu University

JF - Memoirs of the Faculty of Engineering, Kyushu University

SN - 1345-868X

IS - 3

ER -