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Chaotic granular mixing.

Troy Shinbrot1, Albert Alexander, Maher Moakher

  • 1Department of Chemical and Biochemical Engineering, Rutgers University, Piscataway, New Jersey 08854.

Chaos (Woodbury, N.Y.)
|June 5, 2003
PubMed
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This study explores chaotic mixing mechanisms to improve powder blending. It reveals methods to significantly enhance mixing rates, especially for fine powders, in industrial blenders.

Area of Science:

  • Powder Technology
  • Chemical Engineering
  • Materials Science

Background:

  • Existing models for convective mixing are inadequate for fine, cohesive powders.
  • Mixing transverse to the convective direction is often slow and inefficient in granular tumblers.

Purpose of the Study:

  • To investigate chaotic mixing mechanisms for enhancing powder blending.
  • To analyze the effectiveness of these mechanisms in both coarse and fine powders.
  • To demonstrate the applicability of these mechanisms in industrial blender configurations.

Main Methods:

  • Examination of two distinct chaotic mixing mechanisms.
  • Analysis of mixing rates in granular tumblers and industrial blenders.
  • Focus on improving transverse and three-dimensional mixing.

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Main Results:

  • An intentionally applied chaotic mixing mechanism can increase transverse mixing rates significantly.
  • A spontaneous chaotic mixing mechanism in fine grains yields superior mixing rates compared to freely flowing grains.
  • Identical chaotic mixing principles are observed in simple drum mixers and complex industrial blenders.

Conclusions:

  • Chaotic mixing offers a pathway to dramatically improve powder blending efficiency, particularly for challenging fine powders.
  • Judicious process design utilizing chaotic mixing can lead to substantial advancements in three-dimensional powder mixing.
  • The findings are relevant to a wide range of industrial batch operations involving powder blending.