Numerical study of the combined effects of inertia, slip, and compressibility in extrusion of yield stress fluids

Kountouriotis, Zacharias; Georgiou, Georgios C.; Mitsoulis, Evan

doi:10.1007/s00397-014-0803-1

Cited by 6 publications

(2 citation statements)

References 29 publications

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“…Additionally, it was noticed that beyond a certain value of τ 0 , the swell contracts slightly (χ < 1) and reaches a minimum, from which it starts to increase again to reach unity asymptotically. For moderate Reynolds numbers (1 < Re < 200), the scientific literature devoted to the study of the effects of inertia on the extrudate swell of yield-stress fluids is scarce [19,25]. In this situation, as the yield stress increases, swelling at lower Reynolds numbers and contraction at higher Reynolds numbers are reduced.…”

Section: Introductionmentioning

confidence: 99%

Non-Isothermal Free-Surface Viscous Flow of Polymer Melts in Pipe Extrusion Using an Open-Source Interface Tracking Finite Volume Method

2021

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Polymer extrudate swelling is a rheological phenomenon that occurs after polymer melt flow emerges at the die exit of extrusion equipment due to molecular stress relaxations and flow redistributions. Specifically, with the growing demand for large scale and high productivity, polymer pipes have recently been produced by extrusion. This study reports the development of a new incompressible non-isothermal finite volume method, based on the Arbitrary Lagrangian–Eulerian (ALE) formulation, to compute the viscous flow of polymer melts obeying the Herschel–Bulkley constitutive equation. The Papanastasiou-regularized version of the constitutive equation is employed. The influence of the temperature on the rheological behavior of the material is controlled by the Williams–Landel–Ferry (WLF) function. The new method is validated by comparing the extrudate swell ratio obtained for Bingham and Herschel–Bulkley flows (shear-thinning and shear-thickening) with reference data found in the scientific literature. Additionally, the essential flow characteristics including yield-stress, inertia and non-isothermal effects were investigated.

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Section: Introductionmentioning

confidence: 99%

Non-Isothermal Free-Surface Viscous Flow of Polymer Melts in Pipe Extrusion Using an Open-Source Interface Tracking Finite Volume Method

2021

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“…Many attempts have also been made to analyse extrusion through numerical methods (Abdali et al, 1992;Jay et al, 2002;Hatzikiriakos and Mitsoulis, 2009;Kountouriotis et al, 2014). These, however, share the same limitations as theoretical treatments, as they must at some point select a material and wall interaction model to represent the complex real system.…”

Section: Introductionmentioning

confidence: 99%

Flow visualisation and modelling of solid soap extrusion

Bryan

Rough

Wilson

2017

Chemical Engineering Science

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Ram extrusion of a solid granular soap was studied using three geometrically identical but differently-scaled extruders. The experimental design revealed deviation from the Benbow and Bridgwater (1993) extrusion model due to nonideal, scale-dependent effects. Typically these effects, linked to the shear rate in the extruder, are absorbed into the model's material pseudo-properties. The data were able to be represented using the Basterfield et al. (2005) model for extrusion flow which does include a shear rate as a variable. Flow visualisation in conjunction with fluid dynamics-based simulations showed, however, that the assumptions underlying the Basterfield et al. model are not appropriate for soap extrusion, despite the good agreement of the model with the experimental extrusion data. This highlights a need for care in interpretation of extrusion data, in that the limited information gathered about any given experiment, typically just the extrusion pressure, can lead to the generation of spurious parameters if the wrong model is applied.

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Rheology of double-base gelled propellants as the basis for extrusion process modelling: influence of normal force on slip layer and flow curves

2019

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Numerical study of the combined effects of inertia, slip, and compressibility in extrusion of yield stress fluids

Cited by 6 publications

References 29 publications

Non-Isothermal Free-Surface Viscous Flow of Polymer Melts in Pipe Extrusion Using an Open-Source Interface Tracking Finite Volume Method

Non-Isothermal Free-Surface Viscous Flow of Polymer Melts in Pipe Extrusion Using an Open-Source Interface Tracking Finite Volume Method

Flow visualisation and modelling of solid soap extrusion

Rheology of double-base gelled propellants as the basis for extrusion process modelling: influence of normal force on slip layer and flow curves

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