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The Characterisation of the Flow of Aerated Powders
Author(s) -
Lloyd Philip J.,
Webb Peter J.
Publication year - 1986
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.19860030407
Subject(s) - aeration , shear (geology) , materials science , entrainment (biomusicology) , shear stress , mechanics , chemical engineering , mineralogy , composite material , chemistry , engineering , physics , organic chemistry , rhythm , acoustics
This paper reviews the development of a new annular shear cell for the characterisation of aerated powders. The cell enables the measurement of the transmitted shear stress at degrees of aeration below fluidisation. Results are presented for three powders, Alumina, Phosphate Rock and Sodium Carbonate. These show a large reduction in shear stress for small quantities of air entrainment and a transition from normal coulomb‐solid flow to liquid‐type flow at high shear rates. This characterisation enables an explanation of the flooding phenomena experienced in powder handling processes.