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Flow in standpipes and gravity conveyors

  • R. D. Marcus
  • L. S. Leung
  • G. E. Klinzing
  • F. Rizk

Abstract

This chapter is concerned with the flow of solids under gravity. Two types of flow will be considered. In one solids flow downwards in a vertical or inclined tube generally known as a ‘standpipe’. Standpipe flow is often encountered in the outlet of hoppers, in cyclone diplegs and particularly in transferring solids out of a fluidized bed. The other type of gravity flow considered here is analogous to open channel flow of a liquid. This is known as flow in a gravity conveyor or an air-slide. Solids flow down a channel tilted a few degrees to the horizontal (often between 1° and 8°). The solids are fluidized by an upflow of gas close to the minimum fluidization velocity and flow down the channel like a liquid. In this chapter, the two types of gravity flow will be considered separately.

Keywords

Aeration Rate Valve Opening Minimum Fluidization Multiple Steady State Solid Flow 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© R.D. Marcus, L.S. Leung, G.E. Klinzing and F. Rizk 1990

Authors and Affiliations

  • R. D. Marcus
    • 1
  • L. S. Leung
    • 2
  • G. E. Klinzing
    • 3
  • F. Rizk
    • 4
  1. 1.University of PretoriaSouth Africa
  2. 2.Commonwealth Scientific and Industrial Research OrganizationAustralia
  3. 3.University of PittsburghUSA
  4. 4.BASF AG, LudwigshafenGermany

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