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Observation and Analysis of Carbon Black Agglomerate Dispersion in Simple Shear Flows

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Published/Copyright: May 27, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 6 Issue 2

Abstract

Experiments aimed at detecting agglomerate dispersion were performed in a rotating concentric cylinder device mounted in a light scattering monophotometer. The dispersion of carbon black agglomerates suspended in various media (e.g. water, squalene, poly (dimethyl siloxane)) was inferred by measuring changes in turbidity under the application of a controlled simple shear field. In a given suspension the turbidity was observed to be constant for shear rates less than a threshold value. At shear rates in excess of this value, the turbidity was observed to increase monotonically in time to a steady state value. The effects of particle size and fluid viscosity on the critical shear rate necessary to induce agglomerate breakage were examined. Also, the change in the nature of the agglomerate size distribution upon shearing was studied. The results obtained indicate that the breakup of highly structured agglomerated solids such as carbon black does not proceed by a halving process. Also, the initial breakup process was observed to be irreversible.

* Mail address: Prof. Dr. I. Manas-Zloczower, Department of Macromolecular Science, Case Western Reserve University, Cleveland, Ohio 44106, U.S.A.
Accepted: 1990-3-22
Published Online: 2013-05-27
Published in Print: 1991-05-01

© 1991, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Internal Mixers
  4. Spreader Blade Analogy of Flow Past an Internal Mixer Rotor
  5. Observation and Analysis of Carbon Black Agglomerate Dispersion in Simple Shear Flows
  6. Non-Newtonian and Non-Isothermal Modeling of 3D-Flow in an Internal Mixer
  7. Relationship between Rotor Designs in an Internal Mixer and Physical Properties of Mixed Rubber Compounds
  8. Dynamic Modelling of Internal Mixers Using System Identification Techniques
  9. Single Screw Processing
  10. Theoretical Principles Governing the Design of Barrier Sections in Extruders
  11. A Model of Flow in the Mixing Section of the List KoKneader
  12. Twin Screw Extrusion
  13. Drag and Pressure Flow in Twin Screw Extruders
  14. Feed Variance Limitations for Co-rotating Intermeshing Twin Screw Extruders
  15. Fluid Mechanics of Distributive Mixing in a Modular Intermeshing Corotating Twin Screw Extruder
  16. New Ways in the Manufacturing of Finished and Semi-finished Products from Nylon
  17. Mixing in Non-intermeshing Twin Screw Extruders
https://doi.org/10.3139/217.910098

Articles in the same Issue

  1. Contents
  2. Contents
  3. Internal Mixers
  4. Spreader Blade Analogy of Flow Past an Internal Mixer Rotor
  5. Observation and Analysis of Carbon Black Agglomerate Dispersion in Simple Shear Flows
  6. Non-Newtonian and Non-Isothermal Modeling of 3D-Flow in an Internal Mixer
  7. Relationship between Rotor Designs in an Internal Mixer and Physical Properties of Mixed Rubber Compounds
  8. Dynamic Modelling of Internal Mixers Using System Identification Techniques
  9. Single Screw Processing
  10. Theoretical Principles Governing the Design of Barrier Sections in Extruders
  11. A Model of Flow in the Mixing Section of the List KoKneader
  12. Twin Screw Extrusion
  13. Drag and Pressure Flow in Twin Screw Extruders
  14. Feed Variance Limitations for Co-rotating Intermeshing Twin Screw Extruders
  15. Fluid Mechanics of Distributive Mixing in a Modular Intermeshing Corotating Twin Screw Extruder
  16. New Ways in the Manufacturing of Finished and Semi-finished Products from Nylon
  17. Mixing in Non-intermeshing Twin Screw Extruders
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