Numerical simulation of multi‐layer flow for polymer melts—A study of the effect of viscoelasticity on interface shape of polymers within dies

Matsunaga, Keishi; Funatsu, Kazumori; Kajiwara, Toshihisa

doi:10.1002/pen.10277

Cited by 28 publications

(6 citation statements)

References 22 publications

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“…This is their main difference. As shown in the figures and table, several results could be concluded as follows: Compared with the algorithms proposed in several authoritative papers, such as MGA [15] , SA [16] , GA [17] , and TS [18] , the proposed algorithm can achieve better results for FT06, LA01 and LA16 problems.…”

Section: Experimental Results and Analysis (1) Experiments 1: Test Ft0mentioning

confidence: 77%

A hybrid optimization algorithm for the job-shop scheduling problem

Zhou

Cui

Wang

et al. 2009

Proceedings of the First ACM/SIGEVO Summit on Genetic and Evolutionary Computation

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The job-shop scheduling problem is a NP-hard combinational optimization and one of the best-known machine scheduling problems. Genetic algorithm is an effective search algorithm to solve this problem; however the quality of the best solution obtained by the algorithm has to improve due to its limitation. The paper proposes a novel hybrid optimization algorithm for the jobshop scheduling problem, which applies chaos theory on the basis of combining genetic programming and genetic algorithm. It improves the quality of the initial population by using chaos optimization method; it maintains the population diversity by chaotic disturbance and anti-equilibration in crossover of genetic programming. Three traversals are adopted to reduce the chance of reaching local optimal solution. Moreover, a scheme of changing weight is proposed during the process of evolution to increase the global exploration capability. The experimental results show that the effectiveness and good quality of the hybrid algorithm is obvious from some benchmarks.

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Section: Experimental Results and Analysis (1) Experiments 1: Test Ft0mentioning

confidence: 77%

A hybrid optimization algorithm for the job-shop scheduling problem

Zhou

Cui

Wang

et al. 2009

Proceedings of the First ACM/SIGEVO Summit on Genetic and Evolutionary Computation

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“…Martin analyzed the coextrusion process by iterative streamline finite difference method with a two-dimensional model [2] . Other researchers have reported more difficult simulation [3][4][5][6][7][8][9][10][11][12] . Matsunaga et al [6] used the non-Newtonian viscosities simulated twodimensional coextrusion process.…”

Section: Introductionmentioning

confidence: 99%

The Finite Element Simulation of Polymer Coextrusion Based on the Slip Boundary

Zhang

Huang

Sun

et al. 2009

Polymer-Plastics Technology and Engineering

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The three-dimensional flow of Non-Newtonian polymer melts in coextrusion dies was analyzed based on finite element simulations. The analysis considered the slip both die wall-polymer and polymer-polymer interface. The slip boundary condition is founded based on the Generalized Navier slippage model. The effects of die wall roughness on the interface were examined farther. It is found that decreasing the roughness of the fluid path can make the velocity field more uniform and the interfacial offset less. If consider the interface alip of two melts, the homologous of interface-slip coefficient and die-wall slip coefficient may ensure the stabilization of the interface.

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“…Today, nonisothermal analysis 8) and multi-layer flow analysis 9) were reported and the target shifts to more complicated system.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Extrudate Swell Problem and Evaluation of Applicability of Viscoelastic Constitutive Models. 1. A Study on Axisymmetric Extrudate Swell from a Straight Die.

Kajiwara

Tomiyama

Sueyoshi

et al. 2001

J. Soc. Rheol., Jpn

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Numerical simulations of axisymmetric extrudate swell for a low density polyethyrene (LDPE IUPAC-A) melt were carried out using the K-BKZ model as an integral type and the PTT and Larson models as a differential type. We employed both the reversible and irreversible models for the K-BKZ and Larson models to investigate the effect of reversing deformation on the extrudate swell from a straight die. First, relaxation spectrum and nonlinear parameters in the constitutive equation were determined from dynamic data of linear viscoelasticity and steady shear flow data by using the nonlinear regression, and then they were applied to the simulation of extrudate swell problem. We evaluated the applicability of these models by comparing experiments and simulation for both rheological data and extrudate swell ratio. For the K-BKZ model, the reversible model over-estimates the swell ratio in high shear rate, whereas the irreversible model predicts the experimental data with high accuracy. The irreversible Larson model also shows the good prediction of swell, on the other hand, the reversible one over-estimates the swell and there exists the multiple solutions.For the PTT model, we carried out the simulation using the models with different values of nonlinear parameter, ε , which has the same steady shear flow properties and the different properties of stress relaxation under reversing double step deformation. The model having the larger stress in the stress relaxation under reversing double step deformation shows the larger swell. From these results, we find that the consideration of reversing deformation characteristics is required for the extrudate swell from the straight die.

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Numerical simulation of multi‐layer flow for polymer melts—A study of the effect of viscoelasticity on interface shape of polymers within dies

Cited by 28 publications

References 22 publications

A hybrid optimization algorithm for the job-shop scheduling problem

A hybrid optimization algorithm for the job-shop scheduling problem

The Finite Element Simulation of Polymer Coextrusion Based on the Slip Boundary

Numerical Simulation of Extrudate Swell Problem and Evaluation of Applicability of Viscoelastic Constitutive Models. 1. A Study on Axisymmetric Extrudate Swell from a Straight Die.

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