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A theory for effective solid stresses in the annulus of a spouted bed
Author(s) -
McNab G. S.,
Bridgwater J.
Publication year - 1979
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.5450570305
Subject(s) - annulus (botany) , mechanics , plane (geometry) , radius , stress (linguistics) , materials science , horizontal plane , geotechnical engineering , pressure gradient , geology , geometry , mathematics , composite material , physics , linguistics , philosophy , computer security , computer science
With a growing interest in the large scale application of spouted beds, it is important to assess the stresses generated in the annular solids. Factors such as bed height, fluid pressure gradient, spout radius, frictional conditions at spout and vessel walls, and the angle of internal friction of the solid particles may all affect the stresses. Here it is shown how all these variables may be included in an analytical model for the vertical stress distribution in a spouted bed. The approach proceeds through the determination of the mean effective stress on a horizontal plane of the bed is a function of height. Distribution factors, as employed by Walker for bins, are used to relate stresses at the spout wall and the vessel wall to the mean effective stress on a horizontal plane.