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Flushing phenomenon of fine powder

Authors
Journal
Powder Technology
0032-5910
Publisher
Elsevier
Publication Date
Volume
126
Issue
3
Identifiers
DOI: 10.1016/s0032-5910(02)00076-1
Keywords
  • Two-Phase Flow
  • Darcy'S Law
  • Fine Powder
  • Flow Visualization
  • Flushing Region
  • Velocity Profile
  • Numerical Analysis

Abstract

Abstract When a load is applied to a free surface of cohesive fine powder in a vessel, the powder can spurt from a small orifice, which we call the flushing. A gas–solid two-phase flow model using Darcy's law examines this phenomenon. The numerical simulation by this model is qualitatively verified by the measurement for a case when the powder in a rectangular vessel spurts from a slit by a constant piston load. It is found that near the slit, there appears a high-speed region of particle of which velocity is considerably larger than that of free-flowing due to the gravity.

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