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A one‐dimensional model of plug flow pneumatic conveying
Author(s) -
Chan ShuMing,
Remple D.,
Shook C. A.,
Esmail M. N.
Publication year - 1982
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.5450600501
Subject(s) - spark plug , mechanics , plug flow , pressure drop , flow (mathematics) , materials science , thermodynamics , physics
A one‐dimensional model of pulse or plug flow is proposed. This type of flow is observed at high mass ratios of solids to gas and requires gas velocities orders of magnitude less than dilute phase systems. Plug stability criteria are examined by considering the axial interparticle stresses within single plugs and the effect of the radial transmission of these stresses on wall friction. Establishment of the fluid pressure gradient within the plug and the existence of a settled layer of solids in the interplug space are shown to be important requirements. These concepts are used in the formulation of an empirical pressure drop equation which is used in the correlation of experimental data. Comparison of predicted and experimental values is reasonable for the air‐sand system considered. The model should be of value in the planning and interpretation of future experimental studies.