Stokes flow through a single-screw extruder

Blyth, M.G. and Pozrikidis, C. (2007) Stokes flow through a single-screw extruder. AIChE Journal, 53 (1). pp. 69-77. ISSN 0001-1541

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Stokes flow through a single-screw extruder driven either by an axial pressure-gradient, or by the rotation of the screw, or by a combination of both is analyzed. The geometry of the screw is chosen to resemble that encountered in the metering section of a real-life industrial extruder. Working on the simplifying assumption of large helical pitch, a perturbation analysis is performed in non-orthogonal helical coordinates, and contributions to the velocity and pressure fields are computed up to second-order by finite element methods for unidirectional and two-dimensional Stokes flow. Velocity fields are presented for different screw geometries, the axial flow rate is computed for pressure- and rotation-driven flow, comparisons with simple models are made, and the effect of the pitch on the trajectories of passively convected particles is demonstrated. In the case of purely pressure-driven flow, the flow rate decreases, whereas in the case of rotating flow the flow rate increases as the gap between the screw and the barrel is reduced.

Item Type: Article
Faculty \ School: Faculty of Science > School of Mathematics
UEA Research Groups: Faculty of Science > Research Groups > Fluid and Solid Mechanics
Depositing User: Vishal Gautam
Date Deposited: 18 Mar 2011 10:11
Last Modified: 01 Feb 2023 10:30
DOI: 10.1002/aic.11050

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