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Particle and Powder Characteristics

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The Dynamics of Fine Powders

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

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Abstract

Powders are a dense assembly of discrete particles in a gas. It is obvious, therefore, that a description of powders should start with the characteristics of the individual particles such as diameter, shape, density and surface condition.

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Abbreviations

d:

Short axis of ellipsoid (m)

dPA :

Sauter mean diameter (m)

D:

Diameter of container (m)

fn(dp):

Frequency distribution of particles (m -1)

g(dp):

Particle size distribution function on weight basis (kgm -1)

g’(dp):

Normalized weight distribution function (—)

k:

Coordination number (—)

K:

Permeability (m2)

l:

Long axis of ellipsoid (m)

N:

Total number of particles in assembly (—)

SP :

Specific surface area of particle (m -1)

W:

Total weight of assembly (kg)

r:

Radial coordinate (—)

v:

Local fluid velocity (m s -1)

v:

Average fluid velocity (m s -1)

δ:

Volume fraction of large spheres (—)

ε:

External porosity of powder packing (—)

εi :

Internal porosity of particles (—)

ρc :

Fluid density (kg m -3)

ρp :

Particle density (kg m -3)

ρs :

Skeletal density (kg m -3)

σW :

Standard deviation (m)

øA :

Relative spread of specific surface area (—)

øw :

Relative spread on weight basis (—)

ψ:

Sphericity of particle (—)

References

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  • Rodriguez, J., Allibert, C.H. & Chaix, J.M. (1986). A computer method for random packing of spheres of unequal size. Powder Techn., 47, 25.

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  • Rumpf, H. (1958). Grundlagen und Methoden des Granulierens. Chem.-Ing. Techn., 30, 144.

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  • Schwartz, CE. & Smith, J.M. (1953). Flow distribution in packed beds. Ind. Eng. Chem., 45, 1209.

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  • Stovall, T., de Larrard, F. & Buil, M. (1986). Linear packing density model of grain mixtures. Powder Team., 48, 1.

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  • Verwey, E.J. & Overbeek, J.Th.G. (1948). Theory of the Stability of Lyophobic Colloids. Elsevier, Amsterdam.

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Author information

Authors and Affiliations

  1. Europlaan 16, 5691, En Son, The Netherlands

    K. Rietema

Authors
  1. K. Rietema
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© 1991 Elsevier Science Publishers Ltd

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Rietema, K. (1991). Particle and Powder Characteristics. In: The Dynamics of Fine Powders. Elsevier Handling and Processing of Solids Series. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3672-3_2

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  • DOI: https://doi.org/10.1007/978-94-011-3672-3_2

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-1-85166-594-5

  • Online ISBN: 978-94-011-3672-3

  • eBook Packages: Springer Book Archive

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