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Chaotic Features of Flow in Polymer Processing Equipment-Relevance to Distributive Mixing

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Published/Copyright: June 22, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 12 Issue 2

Abstract

The dominant distributive mixing mechanism in polymer processing is convection. Convection, involving movement of fluid elements from one spatial location in the system to another, results in the creation of interfacial area. Length stretch distributions can be used as a measure of distributive mixing efficiency. We have studied the dynamics of distributive mixing in single and tangential twin screw extruders by means of tracking the evolution of particles originally gathered as clusters. Length stretch distributions and the dynamics of the average length stretch indicate that the tangential twin screw extruder is a better mixing device by comparison with the single screw extruder. The chaotic features of flow in these devices, studied by means of Poincaré sections and Lyapunov exponents, correlate well with the distributive mixing efficiency of the equipment.

* Mail address: Prof. I. Manas-Zloczower, Department of Macro-molecular Science, Case Western Reserve University, Cleveland, OH44106, USA
Received: 1996-6-19
Accepted: 1996-10-22
Published Online: 2013-06-22
Published in Print: 1997-05-01

© 1997, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Third in a Series: Pioneers of Polymer Processing: Charles Goodyear
  5. Screw Extrusion/Mixing
  6. Chaotic Features of Flow in Polymer Processing Equipment-Relevance to Distributive Mixing
  7. Influence of Design on Mixing Efficiency in a Variable Intermeshing Clearance Mixer
  8. Simulation of Non-Isothermal Flow in a Modular Buss Kneader and Comparison with Experiment
  9. Rheological Behaviour of LLDPE/LDPE Blends under Elongational Deformation
  10. Effect of Compounding Conditions on Mechanical Properties of Glass Fiber-Reinforced Polyamide-6
  11. Die Extrusion
  12. A New Approach to Simulation of Die Flow which Incorporates the Extruder and Rotating Screw Tips in the Analysis
  13. New Aspects Concerning the Design of Coathanger Dies
  14. Film
  15. On-Line Birefringence Measurement in Film Blowing of a Linear Low Density Polyethylene
  16. Brittle Melt Rupture Phenomena in Polymer Processing
  17. Moulding
  18. Injection Molding of LDPE/BaSO4 Blends
  19. An Experimental Study of Rotational Molding of Polypropylene/Polyethylene Copolymers
  20. Determination of the Inter-Relationships Between Processing Conditions and Properties of an Injection Molded Silicone Ring Using an Experimental Design
  21. Numerical Simulation of the Flow and Fiber Orientation in Reinforced Thermoplastic Injection Molded Products
  22. Wide-Angle X-Ray, Densitometric and Microscopical Studies on Injection Molded Polypropylene Disks
https://doi.org/10.3139/217.970083

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Third in a Series: Pioneers of Polymer Processing: Charles Goodyear
  5. Screw Extrusion/Mixing
  6. Chaotic Features of Flow in Polymer Processing Equipment-Relevance to Distributive Mixing
  7. Influence of Design on Mixing Efficiency in a Variable Intermeshing Clearance Mixer
  8. Simulation of Non-Isothermal Flow in a Modular Buss Kneader and Comparison with Experiment
  9. Rheological Behaviour of LLDPE/LDPE Blends under Elongational Deformation
  10. Effect of Compounding Conditions on Mechanical Properties of Glass Fiber-Reinforced Polyamide-6
  11. Die Extrusion
  12. A New Approach to Simulation of Die Flow which Incorporates the Extruder and Rotating Screw Tips in the Analysis
  13. New Aspects Concerning the Design of Coathanger Dies
  14. Film
  15. On-Line Birefringence Measurement in Film Blowing of a Linear Low Density Polyethylene
  16. Brittle Melt Rupture Phenomena in Polymer Processing
  17. Moulding
  18. Injection Molding of LDPE/BaSO4 Blends
  19. An Experimental Study of Rotational Molding of Polypropylene/Polyethylene Copolymers
  20. Determination of the Inter-Relationships Between Processing Conditions and Properties of an Injection Molded Silicone Ring Using an Experimental Design
  21. Numerical Simulation of the Flow and Fiber Orientation in Reinforced Thermoplastic Injection Molded Products
  22. Wide-Angle X-Ray, Densitometric and Microscopical Studies on Injection Molded Polypropylene Disks
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