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The Dynamics of Fine Powders

  • Book
  • © 1991

Overview

Authors:
  1. K. Rietema

    1. En Son, The Netherlands

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Part of the book series: Handling and Processing of Solids Series (HPSS)

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Table of contents (11 chapters)

  1. Front Matter

    Pages i-xii
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  2. General Introduction

    • K. Rietema
    Pages 1-18

  3. Particle and Powder Characteristics

    • K. Rietema
    Pages 19-38

  4. Mechanics of Powders at Rest

    • K. Rietema
    Pages 39-64

  5. Theoretical Derivation of Interparticle Forces

    • K. Rietema
    Pages 65-94

  6. Two-phase Systems. The Equations of Motion

    • K. Rietema
    Pages 95-121

  7. Stability and Perturbations

    • K. Rietema
    Pages 122-136

  8. Experiments with Homogeneous Fluidization

    • K. Rietema
    Pages 137-150

  9. A Model of Expanded Powders

    • K. Rietema
    Pages 151-161

  10. Rheology of Fluidized Powders

    • K. Rietema
    Pages 162-186

  11. Fluidization in Practice

    • K. Rietema
    Pages 187-228

  12. Handling of Powders

    • K. Rietema
    Pages 229-258

  13. Back Matter

    Pages 259-262
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Keywords

About this book

flour, potato starch, cracking catalyst, sand, and gravel, one will probably agree that the first four materials definitely are powders and the last one certainly is not. Whether one would call sand a powder probably depends on the partiele size and on personal Vlews. When the astronaut Neil Armstrong returned to the Earth from his trip on the surface of the Moon, he stated: 'The surface is fine and powdery. I can kick it up loosely with my toe. It does adhere in fine layers like powdered charcoal to the sole and inside of my boots. I only go in a small fraction of an inch, but I can see the footprints of my boots and the treads in the fine sandy partieles. ' These words elearly show that the behaviour of powders de­ pends on the circumstances. In wh at respects are those on the Moon different from those on the Earth? (1) The gravitational force on the surface of the Moon is only one-sixth of that on the Earth. (2) There is no gas on the Moon. The latter aspect means that any water brought there would evaporate and disappear immediately, hence powders on the Moon will always be perfect1y dry so that cohesion between the separate partieles due to liquid bridges will be zero.

Authors and Affiliations

  • En Son, The Netherlands

    K. Rietema

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