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Interaction between particles and fluids in a gravitational field

  • Chapter
Particle Size Measurement

Part of the book series: Powder Technology Series ((PTS))

Abstract

The settling behaviour of particles in a fluid is widely used for particle size determination. The simplest case to consider is the settling velocity, under gravity, of a single sphere in a fluid of infinite extent. Many experiments have been carried out to determine the relationship between settling velocity and particle size. A unique relationship between drag factor and Reynolds number has been found, and this relationship reduces to a simple equation, the Stokes equation, which applies at low Reynolds number, relating settling velocity and particle size. In this chapter this equation is developed and its limits explored. It is shown that, for the purpose of particle size measurement, the time for a particle to reach a steady velocity (the acceleration time) is negligible.

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Authors and Affiliations

  1. University of Bradford, UK

    Terence Allen Ph.D. (Senior Lecturer in Powder Technology)

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  1. Terence Allen Ph.D.
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© 1981 T. Allen

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Allen, T. (1981). Interaction between particles and fluids in a gravitational field. In: Particle Size Measurement. Powder Technology Series. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-3063-7_7

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  • DOI: https://doi.org/10.1007/978-1-4899-3063-7_7

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-0-412-15410-2

  • Online ISBN: 978-1-4899-3063-7

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