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Characterization of dilute and dense phase vertical upflow gas‐solid transport based on average concentration and velocity data
Author(s) -
Mok S. L. K.,
Bergougnou M. A.,
Molodtsof Y.,
Large J.F.
Publication year - 1989
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450670103
Subject(s) - limiting , mechanics , characterization (materials science) , phase diagram , mass transport , materials science , phase transition , flow (mathematics) , volumetric flow rate , phase (matter) , thermodynamics , chemistry , physics , nanotechnology , mechanical engineering , organic chemistry , engineering physics , engineering
Abstract Dilute, ‘dense phase 1’, and possibly a third regime‐‘dense phase 2’, were observed in a vertical 0.02 m diameter pneumatic conveyor using 210 μm sand particles. The transitions were marked by the alterations in the trend of the measured average solids hold‐up while varying the solids mass flowrate at constant air velocity. Hydrodynamic characteristics together with the transition criteria for the various transport modes were established. A novel regime diagram based on average gas velocities and solids mass flowrates was developed to identify the operating conditions for these regimes, as well as the limiting solids carrying capacities of the present conveyor. A probable cause of the dilute to dense phase transition is speculated upon.