Pressure gradient and particle adhesion in the pneumatic transport of cohesive fine powders

F. J. Wang, J. X. Zhu, J. M. Beeckmans

Research output: Journal PublicationArticlepeer-review

41 Citations (Scopus)

Abstract

Pneumatic transport of Group C 20 μm glass beads was studied in a 31.7 mm vertical line, along with 66 μm Group A glass beads for comparison. Pressure gradients along the riser were measured and the Zenz type state diagrams were constructed for both type of particle. For Group C particles, the results show that the Zenz diagram has the usual characteristic form, but the minimum pressure gradient is much lower and is positioned at a significantly higher gas velocity. Multiple layers of Group C particles were found to adhere to the column wall, while only a fraction of the column inner surface was covered by the 66 μm particles. The effects of the electrostatics effect during solids conveying was also examined through the addition of anti-static particles and was shown to be less significant for the finer particles. This is because the tube inner surface is entirely covered by the particulates, which reduces the charging since only like materials are then in contact.

Original languageEnglish
Pages (from-to)245-265
Number of pages21
JournalInternational Journal of Multiphase Flow
Volume26
Issue number2
DOIs
Publication statusPublished - Feb 2000
Externally publishedYes

Keywords

  • Cohesive powders
  • Electrostatics
  • Particle adhesion
  • Pneumatic transport
  • Ultrafine powder

ASJC Scopus subject areas

  • Mechanical Engineering
  • Physics and Astronomy (all)
  • Fluid Flow and Transfer Processes

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