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Numerical investigation of non-Newtonian fluids in single screw extruders

Kousemaker, T.M. (2017) Numerical investigation of non-Newtonian fluids in single screw extruders. Master's Thesis / Essay, Industrial Engineering and Management.

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This thesis presents the study of a 3D single screw extruder model. Mass transfer including chemical reaction is considered in a novel approach using shear-thinning (Carreau) and shear-thickening models (UVM) programmed in COMSOL. The differences between the two rheological models were investigated in two different screw geometries, using a fixed pitch, and a variable pitch. Results show that considering only shear-thinning underestimates some crucial parameters such as pressure, thermal profile and residence time distribution compared to the shear-thickening fluid, due to differences in the velocity field and rheology. The variable pitch geometry exhibits some peculiarities such as constant residence time distribution regardless the rheological model which we deem needs further investigation. This work provides the first steps in further advances in 3D modelling of extrusion processes, by considering and evaluating more detailed physics and corresponding boundary conditions.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Industrial Engineering and Management
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 08:27
Last Modified: 15 Feb 2018 08:27

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