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Generalized master curve for threshold superficial velocities in particle–fluid systems

Authors
Journal
Powder Technology
0032-5910
Publisher
Elsevier
Publication Date
Volume
183
Issue
2
Identifiers
DOI: 10.1016/j.powtec.2007.07.030
Keywords
  • Pneumatic Conveying
  • Fluidized Beds
  • Pickup Velocity
  • Saltation Velocity
  • Critical Velocity
  • Minimum Fluidization Velocity
  • Terminal Velocity

Abstract

Abstract This paper presents our previous analyses of pickup gas velocity from a layer of particles in pipes and big wind tunnels, pickup liquid velocity, boundary saltation and minimum pressure velocities, and a new analysis of the minimum fluidization velocity and the terminal velocity. All these threshold velocities are defined as simple relations between the Reynolds and Archimedes numbers as modified by various effects. The Reynolds number is modified by taking into account the pipe diameter while the Archimedes number is modified by taking into account various properties that affect each threshold mechanism. Since all threshold velocities could be defined successfully by the same non-dimensional groups it was possible, at the first time, to present a Generalized Master Curve, which provides an overview of all the threshold velocities. This overview enabled, for example, to find quantitatively the relationships between all the threshold velocities to the terminal velocity and to compare the pickup and saltation velocities.

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