Date
2023-05-31Subject
660 Chemical engineering Wood-Plastic-CompositeFließverhaltenStoffeigenschaftNumerische StrömungssimulationMetadata
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Aufsatz
Modeling and numerical simulation of flow processes of wood-polymer composites
Abstract
The combination of natural fibers and polymers is finding expanding application in a range of industrial branches, and knowledge of the material behavior is essential for further improving the products and the processing procedure. In this work, the material behavior of wood-polymer composites (WPC) will be modeled and numerical simulations will be used to investigate the flow behavior. By means of rheological measurements, a shear thinning flow behavior of the composite can be determined, which is also often taken into account in the numerical simulation of WPC processing tools. Increasing shear viscosity and a formation of a yield point with increasing wood content can be observed. However, in addition to the shear-dominant deformation states, noticeable strain deformations also occur due to cross-sectional changes. In order to experimentally investigate and model the behavior of WPC under strain, this work involves measurements on hyperbolic dies in which a uniaxial strain state is present and extensional viscosity can be derived from this. Different boundary conditions such as noSlip, navierSlip and full slip are investigated in the simulations. In addition, during the extrusion of WPC, wall shear stresses of about 0.1 MPa and above can be observed. Measurements in a high-pressure capillary rheometer allow the wall slip velocity to be measured as a function of the wall shear stress at different wood contents. The wall slip behavior is modeled and taken into account accordingly as a boundary condition in the numerical simulations using OpenFOAM [8].
Citation
In: Proceedings in Applied Mathematics and Mechanics (PAMM) Volume 23 / Issue 1 (2023-05-31) eissn:1617-7061Sponsorship
Gefördert im Rahmen des Projekts DEALCitation
@article{doi:10.17170/kobra-202307218450,
author={Liese, Fabian and Wünsch, Olaf},
title={Modeling and numerical simulation of flow processes of wood-polymer composites},
journal={Proceedings in Applied Mathematics and Mechanics (PAMM)},
year={2023}
}
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2023-07-31T15:11:33Z 2023-07-31T15:11:33Z 2023-05-31 doi:10.17170/kobra-202307218450 http://hdl.handle.net/123456789/14956 Gefördert im Rahmen des Projekts DEAL eng Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ 660 Modeling and numerical simulation of flow processes of wood-polymer composites Aufsatz The combination of natural fibers and polymers is finding expanding application in a range of industrial branches, and knowledge of the material behavior is essential for further improving the products and the processing procedure. In this work, the material behavior of wood-polymer composites (WPC) will be modeled and numerical simulations will be used to investigate the flow behavior. By means of rheological measurements, a shear thinning flow behavior of the composite can be determined, which is also often taken into account in the numerical simulation of WPC processing tools. Increasing shear viscosity and a formation of a yield point with increasing wood content can be observed. However, in addition to the shear-dominant deformation states, noticeable strain deformations also occur due to cross-sectional changes. In order to experimentally investigate and model the behavior of WPC under strain, this work involves measurements on hyperbolic dies in which a uniaxial strain state is present and extensional viscosity can be derived from this. Different boundary conditions such as noSlip, navierSlip and full slip are investigated in the simulations. In addition, during the extrusion of WPC, wall shear stresses of about 0.1 MPa and above can be observed. Measurements in a high-pressure capillary rheometer allow the wall slip velocity to be measured as a function of the wall shear stress at different wood contents. The wall slip behavior is modeled and taken into account accordingly as a boundary condition in the numerical simulations using OpenFOAM [8]. open access Liese, Fabian Wünsch, Olaf doi:10.1002/pamm.202200199 Wood-Plastic-Composite Fließverhalten Stoffeigenschaft Numerische Strömungssimulation publishedVersion eissn:1617-7061 Issue 1 Proceedings in Applied Mathematics and Mechanics (PAMM) Volume 23 false e202200199
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