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Materials | Fluidization of Fine Powders - Cohesive versus Dynamical Aggregation

Fluidization of Fine Powders

Cohesive versus Dynamical Aggregation

Series: Particle Technology Series, Vol. 18

Valverde Millán, José Manuel

2013, XVI, 136 p.

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  • Illustrates the state of the art on cohesive versus dynamical aggregation in fluidized beds
  • Provides a clear introduction to the fluidization of powders
  • Offers an insight into the most recent methods and developments for fluidization
  • An optimal balance between theory and applied topics
This book will be mainly devoted to demonstrate 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.

Content Level » Research

Keywords » 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

Related subjects » Chemistry - Industrial Chemistry and Chemical Engineering - Materials - Mechanics - Nanotechnology

Table of contents 

Dedication.- Preface.- Acknowledgements.- Acronyms.- 1 Introduction. The classical Geldart’s diagram and the new type of gas-fluidization behavior.- 2 The structure of Geldart A gas-fluidized beds.- 3 Magnetic stabilization of fluidized beds of magnetizable particles.- 4 The fluidlike behavior of granular materials fluidized by liquids.- 5 The fluidlike behavior of some fine and ultrafine powders fluidized by gas.- 6 On the question of fluidlike fluidization stability.- 7 Dynamic aggregation of fine particles in gas-fluidized beds.- 8 The modified Geldart’s diagram.- 9 Fluidization of nanopowders.- 10 Effect of gas viscosity on the fluidization behavior of fine powders.- 11 Fluidlike fluidization as affected by external fields.- 12 The use of additives to control powder flow. Mechanical properties of fine powder beds.- 13 Fluidization assistance techniques.

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Distribution rights for India: Delhi Book Store, New Delhi, India

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