Fluidization of Fine Powders

1. Front Matter

   Pages I-XV

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2. Introduction. The Classical Geldart’s Diagram and the New Type of Gas-Fluidization Behavior

   • José Manuel Valverde Millán

   Pages 1-6

3. The Structure of Geldart A Gas-Fluidized Beds

   • José Manuel Valverde Millán

   Pages 7-12

4. Magnetic Stabilization of Fluidized Beds of Magnetizable Particles

   • José Manuel Valverde Millán

   Pages 13-22

5. The Fluidlike Behavior of Granular Materials Fluidized by Liquids

   • José Manuel Valverde Millán

   Pages 23-28

6. The Fluidlike Behavior of Fine and Ultrafine Powders Fluidized by Gas

   • José Manuel Valverde Millán

   Pages 29-39

7. On the Question of Fluid-Like Fluidization Stability

   • José Manuel Valverde Millán

   Pages 41-46

8. Dynamic Aggregation of Fine Particles in Gas-Fluidized Beds

   • José Manuel Valverde Millán

   Pages 47-54

9. The Modified Geldart’s Diagram

   • José Manuel Valverde Millán

   Pages 55-64

10. Fluidization of Nanopowders

    • José Manuel Valverde Millán

    Pages 65-73

11. Effect of Gas Viscosity on the Fluidization Behavior of Fine Powders

    • José Manuel Valverde Millán

    Pages 75-83

12. Fluidlike Fluidization as Affected by External Fields

    • José Manuel Valverde Millán

    Pages 85-97

13. The Use of Additives to Control Powder Flow. Mechanical Properties of Fine Powder Beds

    • José Manuel Valverde Millán

    Pages 99-120

14. Fluidization Assistance Techniques

    • José Manuel Valverde Millán

    Pages 121-134

This book covers the rich phenomenology exhibited by fine powders when they are fluidized by a gas flow. Fine powder cohesiveness leads to poor flowability, clumping, difficulty in fluidizing, irregular avalanching behavior, etc. Despite all the inconveniences, fine powder processes pervade the chemical, pharmaceutical, agricultural and mining industries among others. The author in this book analyzes the mechanism by which interparticle adhesive forces are reduced by means of surface additives. Different techniques have been developed in the last years to assist fluidization by helping the gas flow to mobilize and break cohesive aggregates, which help to homogenize fluidization. As reviewed in this book, the use of these techniques may have a relevant impact on novel processes based on fluidized beds of fine powder and with relevant applications on leading edge technologies such as Atomic Layer Deposition on nanoparticles and CO2 capture by gas-fluidized beds of adsorbent powders. The study of fluidized beds has a marked interdisciplinary character.  This book is thus intended for academic and industrial researchers in applied physics, mechanical, chemical, and environmental engineering, who are interested in the special characteristics of fine powders.

• ALD of Nanoparticles
• Cohesive Powders
• Fluidization Assistance Techniques
• Fluidized Bed Reactors
• Fluidized Nanopowders
• Geldart’s Diagram
• Interparticle Attraction
• Powder Technology Industrial Applications
• Richardson and Zaki Equation
• Van der Waals Forces

• Facultad de Fisica, University of Sevilla, Sevilla, Spain

  José Manuel Valverde Millán

José Manuel Valverde Millán is Assistant Professor in the Department of Electronics and Electromagnetism, Faculty of Physics, University of Seville. He is an Associate Editor of the Journal of Nanoparticle Research. His research activity is interdisciplinary and lies between engineering and fundamental physics. A major contribution of his studies was the development of a novel powder tester, which earned him an award by Xerox Co.. He also received the Outstanding Researcher Award by the International Iberian Nanotechnology Laboratory- INL. He has authored 73 journal papers, 4 educational monographs, 5 patents.  He has carried out detailed studies on the fluidization and mechanical properties of fine powders. This work is aimed at formulating models for a deeper understanding of the special behaviour of powder systems. A main subject of his studies has been the development of synthetic powders with enhanced CO2 capture efficiency.

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