Analysis of shear-thinning fluid flow in intermeshing twin-screw extruders

Böhme, Gert; Wünsch, Olaf

doi:10.1007/s004190050109

Cited by 15 publications

(14 citation statements)

References 10 publications

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“…Aufgrund der hohen Viskosität kann der konvektive Anteil in der Bewegungsgleichung vernachlässigt werden [1] [2], nicht aber der konvektive Anteil in der Energiegleichung. Die Strömung in dem Doppelschneckenextruder läßt sich dann in einem Relativsystem berechnen (sehr kleine hydrodynamische Einlauflänge) [1].…”

Section: Theoretische Grundlagenunclassified

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Experimentelle Untersuchung des Temperaturfelds in einem Extruder

Conzen

Wünsch

2006

Proc Appl Math and Mech

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Abb. 1 Experimenteller Aufbau Theoretische GrundlagenDie Strömung in dem Doppelschneckenextruder wird im wesentlichen beschrieben durch die Bilanzgleichungen für Impuls und Energie. Betrachtet man diese im stationären Fall in dimensionsloser Darstellung, steht vor dem konvektiven Anteil der Bewegungsgleichung die Reynoldszahl Re und bei der Energiegleichung die Pecletzahl Pe:Aufgrund der hohen Viskosität kann der konvektive Anteil in der Bewegungsgleichung vernachlässigt werden [1] [2], nicht aber der konvektive Anteil in der Energiegleichung. Die Strömung in dem Doppelschneckenextruder läßt sich dann in einem Relativsystem berechnen (sehr kleine hydrodynamische Einlauflänge) [1]. Die thermische Einlauflänge ist dagegen sehr groß und der Zustand des voll entwickelten Temperaturfelds wird in realen Maschinen nicht erreicht [3]. Das verwendete

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Section: Theoretische Grundlagenunclassified

“…Die Strömung in dem Doppelschneckenextruder läßt sich dann in einem Relativsystem berechnen (sehr kleine hydrodynamische Einlauflänge) [1]. Die thermische Einlauflänge ist dagegen sehr groß und der Zustand des voll entwickelten Temperaturfelds wird in realen Maschinen nicht erreicht [3] …”

Section: Theoretische Grundlagenunclassified

Experimentelle Untersuchung des Temperaturfelds in einem Extruder

Conzen

Wünsch

2006

Proc Appl Math and Mech

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“…Modern CFD tools offer rotating mesh capabilities to handle the rotation of the screws. Another approach is to use a moving frame of reference and a fixed mesh to model the flow field [5,6]. A short review on the various multiphase approaches will be given to the reader.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Viscous Flow in a Partially filled Co-rotating Twin Screw Extruder

Pokriefke

2007

International Polymer Processing

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The free-surface flow of fully melted material in the conveying section of a co-rotating twin screw extruder has been simulated numerically with the Finite Volume Method and an Eulerian multiphase model. In this model the interface is captured in an implicit manner with the help of the local volume fraction in a cell.The results presented here reveal the power and conveying characteristics of the twin screw configuration. Some interesting findings are discussed for the power characteristic in the fully filled state as well. The flow field and derived quantities are discussed with regards to the axial transport, symmetries in the flow field and locations of high energy dissipation. All results are compared to the fully filled state.Additionally, a new term, the volume flux based "conveying degree", is introduced in this paper. The difference to the volume-based degree of fill is pointed out.

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“…The isothermal flow of such fluids in different complex geometries has been considered numerically over several decades in literature. For instance, in [2,3,10,22,23] the pumping and mixing characteristic of Newtonian and non-Newtonian fluids in single and twin screw extruders were investigated. The influence of the temperature on the flow in screw extruders was discussed in [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

A fast numerical approach for the simulation of highly viscous non-isothermal non-Newtonian fluids

Kopecz

Krebs

Meister

et al. 2010

Z. Angew. Math. Phys.

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This paper deals with the efficient simulation of polymer melts, as an example of highly viscous non-isothermal non-Newtonian fluids. In flow fields of our interest, which are characterized by small Reynolds numbers and large Prandtl numbers, steep gradients occur in thin boundary layers of the temperature distribution, whereas the boundary layers associated with the velocity field possess a considerable different length scale. In order to benefit from these properties, we introduce a physically motivated multigrid approach by computing velocity and temperature fields on different meshes. This new development is achieved by the modification of a discrete projection method. Numerical experiments are presented which confirm that the method decreases the computational effort considerably, while preserving the numerical accuracy. (2000). Primary 76A05 · Secondary 76D05 · 76M10. Mathematics Subject Classification

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Analysis of shear-thinning fluid flow in intermeshing twin-screw extruders

Cited by 15 publications

References 10 publications

Experimentelle Untersuchung des Temperaturfelds in einem Extruder

Experimentelle Untersuchung des Temperaturfelds in einem Extruder

Numerical Simulation of Viscous Flow in a Partially filled Co-rotating Twin Screw Extruder

A fast numerical approach for the simulation of highly viscous non-isothermal non-Newtonian fluids

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