Numerical simulation of the flow field in the mixing section of a screw extruder by the lattice Boltzmann model

Buick, James; Cosgrove, J. A.

doi:10.1016/j.ces.2005.11.070

Cited by 11 publications

(16 citation statements)

References 15 publications

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“…There is a wide range of numeric schemes used in literature for melt flow modeling. In [ 76 ], the Lattice gas automata method was used, while in [ 77 ], flow field in the metering zone under isothermal conditions was investigated via the Lattice–Boltzmann method, finding in the latter a good agreement with the analytical solution proposed in [ 61 ].…”

Section: Models For the Materials Extrusionmentioning

confidence: 95%

Analytical and Numerical Models of Thermoplastics: A Review Aimed to Pellet Extrusion-Based Additive Manufacturing

2021

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Recent developments in additive manufacturing have moved towards a new trend in material extrusion processes (ISO/ASTM 52910:2018), dealing with the direct extrusion of thermoplastic and composite material from pellets. This growing interest is driven by the reduction of costs, environmental impact, energy consumption, and the possibility to increase the range of printable materials. Pellet additive manufacturing (PAM) can cover the same applications as fused filament fabrication (FFF), and in addition, can lead to scale towards larger workspaces that cannot be covered by FFF, due to the limited diameters of standard filaments. In the first case, the process is known as micro- or mini-extrusion (MiE) in the literature, in the second case the expression big area additive manufacturing (BAAM) is very common. Several models are available in literature regarding filament extrusion, while there is a lack of modeling of the extrusion dynamics in PAM. Physical and chemical phenomena involved in PAM have high overlap with those characterizing injection molding (IM). Therefore, a systematic study of IM literature can lead to a selection of the most promising models for PAM, both for lower (MiE) and larger (BAAM) extruder dimensions. The models concerning the IM process have been reviewed with this aim: the extraction of information useful for the development of codes able to predict thermo-fluid dynamics performances of PAM extruders.

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Section: Models For the Materials Extrusionmentioning

confidence: 95%

Analytical and Numerical Models of Thermoplastics: A Review Aimed to Pellet Extrusion-Based Additive Manufacturing

2021

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“…This fact has attracted the attention of many researches to investigate various mixing equipments such as twin‐screw extruders , single‐screw extruders , internal mixers , laminar mixing tanks , and simplified mixers such as journal bearing flow (for stirrer tank) and lid‐driven cavity flow (for cross‐channel flow in single‐screw extruders), which have analytical solution as well . A complete literature review on this case can be found in Refs.…”

Section: Introductionmentioning

confidence: 99%

The study of the distributive mixing in converging channels: Numerical method and analytical approach

2015

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Using an in‐house finite element code, we analyzed the isothermal flow field of a polymer melt in a converging channel. More specifically, we calculated the mean strain function as a criterion for distributive mixing. The used power‐law model is implemented to incorporate the shear thinning behavior of the polymeric melts. A parametric study is also presented to provide a good understanding of the complex dependency of the distributive mixing on rheological and geometrical parameters. Finally, an analytical solution for the mixing parameter is developed using some simplifying assumptions and curve‐fitting techniques. POLYM. ENG. SCI., 55:2285–2292, 2015. © 2015 Society of Plastics Engineers

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“…Numerous numerical studies of extrusion flow have been carried out (4), (5), (8) - (10) . Recently numerical analyses of extrusion flows of polymer blends (11) has been performed and the lattice Boltzmann method was applied to the numerical simulation of flows in a screw extruder (12) .…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Extrusion Flows of Polymer Melts and Disclike Particle Suspensions Based on Stochastic Calculation of Their Mesoscale Structures

Shimizu

Yamamoto

2010

JFST

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Flows of complex fluids in a single-screw extruder were numerically simulated using a coupling method of continuum-mechanics-based computations for macroscopic flows and stochastic simulations for fluid mesoscale structures and the advantage of micro-macro simulations for complex fluids was investigated. In the present study, flows of polymer melts and dilute suspensions of disclike particles were considered and a simple model for the extrusion flow in which the flow is approximated by a shallow channel flow, was adopted. In the simulation for polymer melts, the Curtiss-Bird model was applied to represent the dynamics of polymer networks. The orientation behavior of polymers was analyzed and its dependence on the Weissenberg number was investigated. In addition, a low-cost method for plotting the distribution of orientation angle of polymers was proposed. In this method, additional stochastic simulation was performed at a sampling point in the flow field. The dependence of orientation angle on the gap wise position in an extruder was captured in more detail by this method. In the simulation of suspensions of disclike particles, a disclike particle was modeled by an oblate spheroid, and the motion of particles was computed using the stochastic differential equation for orientation vectors of oblate spheroids. The orientation behavior of particles was analyzed to find that the present approach is effective also for the suspension flows.

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Numerical simulation of the flow field in the mixing section of a screw extruder by the lattice Boltzmann model

Cited by 11 publications

References 15 publications

Analytical and Numerical Models of Thermoplastics: A Review Aimed to Pellet Extrusion-Based Additive Manufacturing

Analytical and Numerical Models of Thermoplastics: A Review Aimed to Pellet Extrusion-Based Additive Manufacturing

The study of the distributive mixing in converging channels: Numerical method and analytical approach

Numerical Simulation of Extrusion Flows of Polymer Melts and Disclike Particle Suspensions Based on Stochastic Calculation of Their Mesoscale Structures

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