Numerical Simulation of Viscoelastic Extrudate Swell Through Elliptical Ring Die

›› 2011, Vol. 19 ›› Issue (1): 10-17.

• FLUID FLOW AND TRANSPORT PHENOMENA • Previous Articles Next Articles

Numerical Simulation of Viscoelastic Extrudate Swell Through Elliptical Ring Die

XU Xingming^1,2, ZHAO Guoqun², QIN Shengxue³, WANG Wei¹

1. College of Mechanical and Electrical Engineering, Shandong University of Science and Technology, Tai’an 271019, China;
2. Engineering Research Center for Mold&Die Technologies, Shandong University, Jinan 250061, China;
3. College of Mechanical and Electrical Engineering, Shandong University of Science and Technology, Qingdao 266510, China

Received:2009-12-13 Revised:2010-12-12 Online:2011-02-28 Published:2011-02-28
Supported by:
Supported by the National Science Foundation for Distinguished Young Scholars of China(50425517);the Shandong Province Natural Science Foundation(Y2007F59)

Numerical Simulation of Viscoelastic Extrudate Swell Through Elliptical Ring Die

许星明^1,2, 赵国群², 秦升学³, 王威¹

1. College of Mechanical and Electrical Engineering, Shandong University of Science and Technology, Tai’an 271019, China;
2. Engineering Research Center for Mold&Die Technologies, Shandong University, Jinan 250061, China;
3. College of Mechanical and Electrical Engineering, Shandong University of Science and Technology, Qingdao 266510, China

通讯作者: ZHAO Guoqun, E-mail: zhaogq@sdu.edu.cn
基金资助:
Supported by the National Science Foundation for Distinguished Young Scholars of China(50425517);the Shandong Province Natural Science Foundation(Y2007F59)

Abstract

Abstract: The numerical simulation of extrudate swell is significant in extrusion processing.Precise prediction of extrudate swell is propitious to the control of melt flow and the quality of final products.A mathematical model of three-dimensional(3D)viscoelastic flow through elliptical ring die for polymer extrusion was investigated.The penalty function formulation of viscoelastic incompressible fluid was introduced to the finite element model to analyze 3D extrusion problem.The discrete elastic viscous split stress(DEVSS)and streamline-upwind PetrovGalerkin(SUPG)technology were used to obtain stable simulation results.Free surface was updated by updating the streamlines which needs less memory space.According to numerical simulation results,the effect of zero-shear viscosity and elongation parameter on extrudate swell was slight,but with the increase of volumetric flow rate and relax time the extrudate swell ratio increased markedly.Finally,the numerical simulation of extrudate swell flow for low-density polyethylene(LDPE)melts was investigated and the results agreed well with others’work.These conclusions provided quantitative basis for the forecasting extrudate swell ratio and the controlling of extrusion productivity shape.

Key words: viscoelastic fluid, extrudate swell, finite element method, polymer extrusion

摘要： The numerical simulation of extrudate swell is significant in extrusion processing.Precise prediction of extrudate swell is propitious to the control of melt flow and the quality of final products.A mathematical model of three-dimensional(3D)viscoelastic flow through elliptical ring die for polymer extrusion was investigated.The penalty function formulation of viscoelastic incompressible fluid was introduced to the finite element model to analyze 3D extrusion problem.The discrete elastic viscous split stress(DEVSS)and streamline-upwind PetrovGalerkin(SUPG)technology were used to obtain stable simulation results.Free surface was updated by updating the streamlines which needs less memory space.According to numerical simulation results,the effect of zero-shear viscosity and elongation parameter on extrudate swell was slight,but with the increase of volumetric flow rate and relax time the extrudate swell ratio increased markedly.Finally,the numerical simulation of extrudate swell flow for low-density polyethylene(LDPE)melts was investigated and the results agreed well with others’work.These conclusions provided quantitative basis for the forecasting extrudate swell ratio and the controlling of extrusion productivity shape.

关键词: viscoelastic fluid, extrudate swell, finite element method, polymer extrusion

XU Xingming, ZHAO Guoqun, QIN Shengxue, WANG Wei. Numerical Simulation of Viscoelastic Extrudate Swell Through Elliptical Ring Die[J]. , 2011, 19(1): 10-17.

许星明, 赵国群, 秦升学, 王威. Numerical Simulation of Viscoelastic Extrudate Swell Through Elliptical Ring Die[J]. , 2011, 19(1): 10-17.

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Numerical Simulation of Viscoelastic Extrudate Swell Through Elliptical Ring Die

Numerical Simulation of Viscoelastic Extrudate Swell Through Elliptical Ring Die

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