Discrete element simulations and validation tests investigating solids-conveying processes with pressure buildup in single screw extruders

Lessmann, Johann-Sebastian; Schöeppner, Volker

doi:10.1063/1.4942314

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…This is intended to determine the optimal feed zone geometry. For this purpose, a test stand is developed (similar to [ 53 , 54 ]) that only covers the barrel’s feed zone ( Figure 9 ). The test stand was developed within the research project (see funding below, grant number ZF4041120CM7) together with the company Helix GmbH (Winnenden, Germany).…”

Section: Methods and Experimentsmentioning

confidence: 99%

Enhanced Processing of Regrind as Recycling Material in Single-Screw Extruders

Thieleke

Bonten

2021

Polymers

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Regrind processing poses challenges for single-screw extruders due to the irregularly shaped particles. For grooved feed zones, the output is lessened by the reduction of bulk density in comparison to virgin material. Simultaneously, the melt temperature increases, reducing the extruder’s process window. Through experimental investigations on a test stand, a novel feed zone geometry (nominal diameter 35 mm) is developed. It aligns the regrind’s specific throughput with that of virgin material. The regrind processing window is essentially increased. As the solids conveying in the novel feed zone cannot be simulated with existing methods, numerical simulations using the discrete element method are performed. Since plastic deformation occurs in the novel feed zone geometry, a new hysteresis contact model is developed. In addition to spheres, the regrind and virgin particles are modeled as superquadrics to better approximate the irregular shape. The new contact model’s simulation results show excellent agreement with experimental compression tests. The throughput of the extruder simulations is considerably underestimated when using spheres to represent the real particles than when using irregularly shaped superquadrics. Corresponding advantages can be seen especially for virgin material.

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Section: Methods and Experimentsmentioning

confidence: 99%

Enhanced Processing of Regrind as Recycling Material in Single-Screw Extruders

Thieleke

Bonten

2021

Polymers

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“…Since then, further works such as Schöppner et al [ 16 , 17 ] and Celik and Bonten [ 18 ] focused on the application of DEM. In addition, Leßmann [ 19 , 20 ] investigated a smooth extruder with rotational speeds up to 900 min −1 and considered axial forces acting on granules.…”

Section: Introductionmentioning

confidence: 99%

A Novel Modeling Approach for Plastics Melting within a CFD-DEM Framework

et al. 2021

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Existing three-dimensional modeling approaches to single-screw extrusion can be classified according to the process sections. The discrete element method (DEM) allows describing solids transport in the feed section. The melt flow in the melt section can be calculated by means of computational fluid dynamics (CFD). However, the current state of the art only allows a separate consideration of the respective sections. A joint examination of the process sections still remains challenging. In this study, a novel modeling approach is presented, allowing a joint consideration of solids and melt transport and, beyond that, the formation of melt. For this purpose, the phase transition from the solid to liquid states is modeled for the first time within the framework CFDEMCoupling®, combining CFD and DEM by a novel melting model implemented in this study. In addition, a melting apparatus for the validation of the novel melting model is set up and put into operation. CFD-DEM simulations are carried out in order to calculate the melting rate and are compared to experimental results. A good agreement between the simulation and experimental results is found. From the findings, it can be assumed that the CFD-DEM simulation of single-screw extruder with a joint consideration of the feed and melt section is feasible.

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Calibration of a contact model for DEM simulations of grooved feed sections of single screw extruders

Brüning¹,

Schöppner²

2023

International Conference on Humans and Technology: A Holistic and Symbiotic Approach to Sustainable Development: Icht 2022

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Discrete element simulations and validation tests investigating solids-conveying processes with pressure buildup in single screw extruders

Cited by 4 publications

References 7 publications

Enhanced Processing of Regrind as Recycling Material in Single-Screw Extruders

Enhanced Processing of Regrind as Recycling Material in Single-Screw Extruders

A Novel Modeling Approach for Plastics Melting within a CFD-DEM Framework

Calibration of a contact model for DEM simulations of grooved feed sections of single screw extruders

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