A new model of flow in a tangential counter‐rotating twin screw extruder

Kim, Myung‐Hee Y.; Szydlowski, Witold; White, James L.; Min, Kyonsuku

doi:10.1002/adv.1989.060090109

Cited by 17 publications

(2 citation statements)

References 18 publications

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“…A different formulation is required to consider flow between the rotors. This was considered in the work of Kim et al (25)(26)(27) for tangential counter-rotating twin screw extruders and later for continuous mixers (16). These are Cartesian coordinate based formulations.…”

Section: Flow Between Rotorsmentioning

confidence: 99%

New model of flow in a Farrel Continuous Mixer

Bang

White

1997

Polymer Engineering & Sci

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A model for flow in a Farrel Continuous Mixer based upon cylindrical coordinate hydrodynamic lubrication theory is presented. Pressure and flux fields over the rotor surface are calculated. The pumping characteristics of the various sections of the machine rotors were calculated. Generally Farrel Continuous Mixers are operated under starved conditions. Calculations are presented for continuous mixers operating under starved conditions. Pressure and fill factor profiles are determined. Fill factors are predicted to be increased by increasing throughput, increasing exit gate pressure and reducing screw speed.

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Section: Flow Between Rotorsmentioning

confidence: 99%

New model of flow in a Farrel Continuous Mixer

Bang

White

1997

Polymer Engineering & Sci

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“…Te early simulation technology for twin screw extrusion mainly refers to the one-dimensional (1D) analysis method based on lubrication theory [4]. In this method, the extruder is unwound along the channel, and only the mean value of parameters along the axial can be obtained.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Multiphase Flow and Mixing in a Conveying Element of a Co-Rotating Twin-Screw Extruder by Using SPH

Dong,

Wu,

Ruan

et al. 2023

International Journal of Chemical Engineering

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Multiphase flows and mixing in partially filled conveying elements of twin-screw extruders (TSEs) were simulated by using smoothed-particle hydrodynamics (SPH). A validation of SPH using experiment from the literature for a co-rotating twin-cam mixer indicated good agreement. A two-phase Poiseuille flow was also used to validate the accuracy of our approach. The results of two-phase flow in TSE show that the viscosity ratio significantly affects the flow and mixing of two-phase fluids. The symmetry of flow field is broken with different parameters. In the full filled case, the pressure squeezes particles into the gap, which is conducive to improve the performance of mixing of fluids. On the contrary, in the partially filled case, because there is no background pressure, particles tend to bypass the gap and flow to the cavity of the chamber. This work laid a foundation for further study of polymer blending by simulation.

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Pressure‐related driving forces in the fully filled nonintermeshing twin screw extruder

1993

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Research in understanding the mechanisms behind driving forces in the fully filled nonintermeshing twin screw extruder concentrated on experimental analysis of the relation between stagger, screw speed, and cross-channel flow due to measured pressure differential in the nip region. A new measure of the pressure driving force was also sought out, to correlate new data to previous findings from visual studies. The first part of the study was to obtain the values for the dynamic pressure on both sides of the nip region. Further refinements to the equipment used in previous studies allowed closer placement of the transducers in the nip region. After the data were stored, analysis started by determining the Ap values from the trace of the pressure differential. By plotting these values, we obtain a highly repeatable curve confirming that the greatest pressure flow occurs at small staggers. A simple 2-D model for pressure flow in the nip region was used to estimate the effect of the cross-channel pressure differential. Values for the cross-channel pressure flow were calculated and compared with the drag flow and found to be significant.

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A new model of flow in a tangential counter‐rotating twin screw extruder

Abstract: The flow of Newtonian fluids in a tangential counter-rotating twin screw extruder with matched and staggered screw flights is analyzed using hydrodynamic lubrication theory. The flow analysis network (FAN) method of Tadmor et al. as modified by Sqdlowski et al. [Znt. Polym. Proc.,1, 207

Cited by 17 publications

References 18 publications

New model of flow in a Farrel Continuous Mixer

New model of flow in a Farrel Continuous Mixer

Simulation of Multiphase Flow and Mixing in a Conveying Element of a Co-Rotating Twin-Screw Extruder by Using SPH

Pressure‐related driving forces in the fully filled nonintermeshing twin screw extruder

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