Numerical analysis of mixing performance of mixing section in pin-barrel single-screw extruder

2011 ◽  
Vol 31 (1) ◽  
Author(s):  
Jinnan Chen ◽  
Pan Dai ◽  
Hui Yao ◽  
Tung Chan
Keyword(s):  
Numerical Analysis ◽  
Finite Elements ◽  
Flow Field ◽  
Residence Time ◽  
Particle Tracking ◽  
Mixing Efficiency ◽  
Screw Extruder ◽  
Mixing Performance ◽  
Single Screw ◽  
Single Screw Extruder

Abstract Using the finite elements method, numerical simulations of the flow field of a rubber melt in the mixing sections of a conventional full-flight single-screw extruder and a pin-barrel single-screw extruder were carried out. Particle tracking analysis was used to statistically analyze the mixing state of the rubber melt in the mixing section with pin and that without pin. The mixing performance of both types of mixing section was quantitatively evaluated. The results show that the pins partially disorganize the particle trajectories, change the particle moving directions, and enhance the mixing performance. The particle residence time is longer in the mixing section with pins than in the mixing section with no pin, leading to better mixing in the former. The distributive mixing of particles in both types of mixing section was statistically analyzed. The pins increase the efficiency of stretching and the time-averaged efficiency of stretching, and hence the mixing efficiency. However, further increase in the number of pins does not necessarily enhance the mixing performance.

Analysis of Mixing Efficiency in a Multi-Cut Transfermix

1995 ◽  
Vol 68 (5) ◽  
pp. 773-782 ◽  
Author(s):  
Tao Li ◽  
Hongfei Cheng ◽  
Ica Manas-Zloczower
Keyword(s):  
Three Dimensional ◽  
Mixing Efficiency ◽  
Power Law Model ◽  
Screw Extruder ◽  
Axial Pressure ◽  
Three Dimensional Flow ◽  
Single Screw ◽  
Single Screw Extruder ◽  
Model Fluid ◽  
Constant Output

Abstract Three-dimensional flow patterns of a power-law model fluid in a Multi-Cut Transfermix were calculated. A particle tracking algorithm was used to study the dynamics of mixing. Distributive mixing efficiency was quantified in terms of length stretch distributions and average values. The influence of rotational speed and axial pressure difference on mixing efficiency, under constant output was analyzed. The mixing performances in the MCT was also compared with that in a single screw extruder with the same dimensions as the entrance region of MCT and operating at the same flow rate.

Residence Time Distributions for Wheat Starch in a Single Screw Extruder

1983 ◽  
Vol 48 (4) ◽  
pp. 1157-1161 ◽  
Author(s):  
V. J. DAVIDSON ◽  
D. PATON ◽  
L. L. DIOSADY ◽  
W. A. SPRATT
Keyword(s):  
Residence Time ◽  
Wheat Starch ◽  
Screw Extruder ◽  
Single Screw ◽  
Single Screw Extruder ◽  
Residence Time Distributions

scholarly journals Modelling non-homogeneous flow and residence time distribution in a single-screw extruder by means of Markov chains

2012 ◽  
Vol 50 (8) ◽  
pp. 2141-2154 ◽  
Author(s):  
Denis Ponomarev ◽  
Elisabeth Rodier ◽  
Martial Sauceau ◽  
Clémence Nikitine ◽  
Vadim Mizonov ◽  
...  
Keyword(s):  
Markov Chains ◽  
Residence Time ◽  
Time Distribution ◽  
Residence Time Distribution ◽  
Screw Extruder ◽  
Homogeneous Flow ◽  
Single Screw ◽  
Single Screw Extruder

scholarly journals Chaotic Mixing in a Free Helix Extruder using a New Solution to the Biharmonic Equation

2021 ◽  
Author(s):  
Gregory Campbell ◽  
Ross Taylor ◽  
Mark Wetzel ◽  
Sirisha Bomma ◽  
Shaji Chempath ◽  
...  
Keyword(s):  
Flow Field ◽  
Time Distribution ◽  
Residence Time Distribution ◽  
Biharmonic Equation ◽  
Cross Flow ◽  
Chaotic Mixing ◽  
Screw Extruder ◽  
Chaotic Flow ◽  
Single Screw ◽  
Single Screw Extruder

A recently published approach for modeling the cross flow in an extruder channel using a new solution to the biharmonic equation is utilized in a study of chaotic mixing in a free helix single screw extruder. This novel extruder was designed and constructed with the screw flight, also referred to as the helix, detached from the screw core. Each of the screw elements could be rotated independently to obtain chaotic motion in the screw channel. Using the new extruder, experimental evidence for the increased mixing of a dye, for both a Dirac and droplet input, with a chaotic flow field relative to the traditional residence time distribution is presented. These experimental results are compared using the new biharmonic equation-based model. Because of the ability to periodically rotate only the flight/helix, the chaotic mixing results are minimally confounded by the existence of Moffat eddies.

scholarly journals Evaluation of Distributive Mixing Performance of Fin Type Screw for a Single Screw Extruder

Seikei-Kakou ◽  
2018 ◽  
Vol 30 (8) ◽  
pp. 445-451
Author(s):  
Koichi Kimura ◽  
Hideki Tomiyama ◽  
Yasuya Nakayama ◽  
Toshihisa Kajiwara
Keyword(s):  
Screw Extruder ◽  
Mixing Performance ◽  
Single Screw ◽  
Single Screw Extruder

Investigation of Mixing Performance in the Extruder with Embedded Planetary-Screws

2013 ◽  
Vol 781-784 ◽  
pp. 2809-2816
Author(s):  
Liang He ◽  
Bai Ping Xu ◽  
Hui Wen Yu ◽  
Xiao Long Wang ◽  
Gang Xue
Keyword(s):  
The Novel ◽  
Screw Extruder ◽  
Mixing Performance ◽  
Single Screw ◽  
Single Screw Extruder ◽  
Laminar Mixing ◽  
Single Screw Extruders ◽  
Twin Screw ◽  
Screw Extruders

The novel geometrical configuration of embedded planetary-screws is proposed in the paper. The corresponding numerical simulation and the experimental investigation are carried out to characterize the mixing performance. Adopting commercial software FLUENT, the simplified physical model is presented with the boundary conditions imposed by UDF codes which are developed by us. Compared with the traditional single screw extruder, the flow and mixing are primarily investigated by using particle tracking technology. The sensitivity to initial positions is found in the novel screw configuration, which is caused by the periodic perturbation of planetary-screws. In contrast, the traditional laminar mixing occurs in single screw extruders. Compared with the traditional twin screw extruder, the experimental characterization of filled system of adding active nanometer CaCO3 into LLDPE matrix is conducted. No obvious difference in dispersion of CaCO3 is found when the extrusion samples are observed through scanning electron microscopy (SEM), on the condition that the both extrusion outputs are equal. The shear rate in the novel screw configuration is relatively smaller, and the extrusion characteristic is more excellent.

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