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Critical fluid velocity and power requirement for the startup of a capsule pipeline
Author(s) -
Figueiredo O.,
Charles M. E.
Publication year - 1968
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.5450460112
Subject(s) - pipeline (software) , capsule , slurry , mechanics , power (physics) , pipeline transport , pressure gradient , critical ionization velocity , materials science , chemistry , geology , physics , mechanical engineering , thermodynamics , engineering , composite material , paleontology
The pipeline transport of solids in the form of capsules appears to have advantages over the conventional slurry operation. One of the problems which must be faced, however, is the startup of a capsule pipeline which has been temporarily shut down. Data are presented for the fluid velocity and pressure gradient which were required to initiate movement of 3‐in. long cylindrical capsules equally spaced at various linear concentrations on the bottom of a 1‐in. diameter model pipeline. The specific gravity of the capsules ranged from 1.40 to 8.44 and capsule diameter to pipe diameter ratio ranged from 0.247 to 0.868. For a given set of capsules, the critical fluid velocity passed through a minimum, and the critical pressure gradient passed through a maximum, at a linear concentration of about 60–65%. The critical power consumption, however, was only slightly dependent on linear concentration. For a given linear concentration, the critical power requirement increased concomitantly with capsule specific gravity.