Numerical Modeling of the Mixing of Highly Viscous Polymer Suspensions in Partially Filled Sigma Blade Mixers

Roland, Michael; Ottsen, Tobias; Olofsson, Erik Tomas Holmen; Spangenberg, Jon

doi:10.3390/polym15081938

Cited by 3 publications

(2 citation statements)

References 36 publications

(54 reference statements)

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“…Rotational flow dominates at the edge of the blade, and the material and blades rotate synchronously without deformation, also known as the "dead zone" of flow. Larsen et al 21 presented a non-isothermal, non-Newtonian computational fluid dynamics (CFD) model, which can be used in the simulation of highly viscous polymer suspensions in a partially filled twin-sigma mixer. The results revealed that the dispersive mixing and distributive mixing were hardly affected by changing the wall temperature and preheating temperature.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Hydrodynamics and Mixing Characteristics of High-Viscosity Non-Newtonian Fluid in Twin-Shaft Kneaders

Shuai,

An,

Hong

et al. 2024

Ind. Eng. Chem. Res.

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The hydrodynamics of high-viscosity non-Newtonian fluid in three different twin-shaft kneaders were simulated by the finite element method (FEM) and mesh superposition technique (MST). The particle tracing technology is used to explore the mixing process and mechanism. The elongational flow and shear flow coexist in the kneaders, and the shear flow is dominant close to the wall, while the elongational flow is dominant far away from the wall. The twin-shaft kneader where the distance of the adjacent disc is the closest (Asymmetric-Disc kneader) results in the highest shear rate and power consumption. There are strong compression and stretching effects in the overlapping zone, which promote the mixing process. The static kneading rods can significantly enhance the reorientation of particles and increase the stretch length and mixing efficiency while the power consumption increases slightly. Considering the mixing ability and power consumption, the mixing ability of the three kneaders is ranked as Static-Rod kneader > Asymmetric-Disc kneader > Open-Window kneader.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Hydrodynamics and Mixing Characteristics of High-Viscosity Non-Newtonian Fluid in Twin-Shaft Kneaders

Shuai,

An,

Hong

et al. 2024

Ind. Eng. Chem. Res.

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“…This newly developed numerical method proved its effectiveness in handling complex fluid flow scenarios, including confined flows and extrudate swell simulations of Boger fluids. Larsen et al [ 2 ] presented a non-isothermal, non-Newtonian Computational Fluid Dynamics model for the mixing of a highly viscous polymer suspension in a partially filled sigma blade mixer. This model accounts for viscous heating and the free surface of the suspension.…”

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confidence: 99%

Polymer Physics: From Theory to Experimental Applications

Fernandes,

Ferrás,

Afonso

2024

Polymers

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Analyzing Homogeneity of Highly Viscous Polymer Suspensions in Change Can Mixers

Larsen,

Holmen Olofsson,

Spangenberg

2024

Polymers

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The mixing of highly viscous non-Newtonian suspensions is a critical process in various industrial applications. This computational fluid dynamics (CFD) study presents an in-depth analysis of non-isothermal mixing performance in change can mixers. The aim of the study was to identify parameters that significantly influence both distributive and dispersive mixing in these mixers, which are essential for optimizing industrial mixing processes. The study employed a numerical design of experiments (DOE) approach to identify the parameters that most significantly influence both distributive and dispersive mixing, as measured by the Kramer mixing index (MKramer) and the Ica Manas-Zloczower mixing index λMZ¯. The investigated parameters included mixing time, number of arms, arm size ratio, revolutions per minute (RPM), z-axis rotation, z-axis movement, and initial and mixing temperatures. The methodology involved employing the bootstrap forest algorithm for predicting the mixing indices, achieving an R2 of 0.949 for MKramer and an R2 of 0.836 for λMZ¯. The results indicate that the z-axis rotation has the greatest impact on both distributive and dispersive mixing. An increased number of arms negatively impacted λMZ, but had a small positive effect on MKramer. Surprisingly, in this study, neither the initial temperature of the material nor the mixing temperature significantly impacted the mixing performance. These findings highlight the relative importance of operational parameters over traditional temperature factors and provide a new perspective on mixing science.

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Numerical Modeling of the Mixing of Highly Viscous Polymer Suspensions in Partially Filled Sigma Blade Mixers

Cited by 3 publications

References 36 publications

Numerical Simulation of Hydrodynamics and Mixing Characteristics of High-Viscosity Non-Newtonian Fluid in Twin-Shaft Kneaders

Numerical Simulation of Hydrodynamics and Mixing Characteristics of High-Viscosity Non-Newtonian Fluid in Twin-Shaft Kneaders

Polymer Physics: From Theory to Experimental Applications

Analyzing Homogeneity of Highly Viscous Polymer Suspensions in Change Can Mixers

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